Difference between revisions of "G2p Analysis Minutes"

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==1/8/2013==  
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Present: Jixie, Vince, Jie, Min, Melissa,Chao, JP, Karl <br>
−
 
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+
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----
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==12/18/2012==  
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Present: Jixie, Vince, Jie, Min, Melissa <br>
+
 
By-Phone: Ryan, Toby, Pengjia <br>
 
By-Phone: Ryan, Toby, Pengjia <br>
  
 
'''General discussion'''
 
'''General discussion'''
  
−
NO meetings for the following 2 weeks.
+
* APS abstract deadline will be this Friday> The deadlines for GHP and INPC are also very <br>
 +
closed. Those who want to attend these conference please prepare the abstract as early as possible. <br>
  
 
'''Feature presentation:'''
 
'''Feature presentation:'''
  
−
*Pengjia:  
+
* Min:
−
**Present the status of the BPM calibration. There are some updates in the software package. <br>
+
** Present the Ytg optimization for R-HRS using NO target field data. See details [http://hallaweb.jlab.org/experiment/g2p/collaborators/mhuang/01082013.pdf here]. <br>  
−
**Pengjia need to use the distribution average of the position at BPM A and B to calculate the <br>
+
** Prepare the non-raster SNAKE backward model for Chao.
−
position at target, not the instant measurement values. See the details [http://hallaweb.jlab.org/experiment/g2p/collaborators/pzhu/12182012/bpm_status_12182012.pdf  here]<br>
+
−
 
+
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*Toby:
+
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**New version of analyzer is released. Trying to switch to the new version. <br>
+
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**Testing the replay scripts after including the BPM packages. <br>
+
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**Waiting for calibration constants from other students. <br>
+
−
 
+
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*Ryan:
+
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**Moving back to do optics optimization for RHRS, 5T longitudinal field data set. <br>
+
−
 
+
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*Jixie:
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**Dave Meekins have a very nice figure about the g2p target. Click [http://hallaweb.jlab.org/experiment/g2p/collaborators/jixie/20121218_TargetStuff/G2P_Target_DaveMeekins.pdf here] to view it. <br>
+
−
**Got the C12 foil target holder drawing from Josh. This [http://hallaweb.jlab.org/experiment/g2p/collaborators/jixie/20121218_TargetStuff/carbon_holder.pdf drawing] shows that the C12 foil has a <br>
+
−
extra holder of 50 mil thick. It also indicates that the C12 foil is located at the upstream end cap<br>
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location, not the insert! (It was designed to be at the insert.)  Optics and simulation need to take
+
−
this into account.
+
−
 
+
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*Jie:
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**Present the status of the study to the pion rejector's efficiency. Check details [http://hallaweb.jlab.org/experiment/g2p/collaborators/jie/2012_12_18_pssh_lhrs/2012_12_18_pion_rejector.pdf here]. <br>
+
−
**Melissa and Jie will work out a calibration constant set and send to Toby. <br>
+
−
 
+
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*Min:
+
−
**Verifying the optimizer is really taking the survey parameters. <br>
+
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**Will run it again once beam position are ready. Then do Ytg calibration. <br>
+
−
 
+
−
----
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+
−
==12/04/2012==
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−
Present: Jixie, Vince, Chao, Jie, Min, Kalyan, Karl, Melissa <br>
+
−
By-Phone: Ryan, Toby, Pengjia <br>
+
−
 
+
−
'''General discussion'''
+
−
 
+
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*Dry run talks for the Hall A calibration will be held 1 PM Wednesday. Vince will <br>
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reserve a room. <br>
+
−
 
+
−
'''Feature presentation:'''
+
−
*Min:
+
−
**Tried to understand the discrepancy between the spectrometer in SNAKE model and the<br> 
+
−
real spectrometer. Generated a new no-raster SNAKE model with the same quadruples setting as<br>
+
−
real experiment. See details [http://hallaweb.jlab.org/experiment/g2p/collaborators/mhuang/120412/12042012.pdf here]. <br>
+
−
 
+
−
*Chao:
+
−
**Studied the discrepancy between simulation and real data.  See the talk [http://hallaweb.jlab.org/experiment/g2p/collaborators/chao/20121204/Chao_WeeklyMeeting_12042012.pdf here]. <br>
+
−
***The optimized database was optimized from a narrow distribution of theta and phi, which<br>
+
−
might not work well for area beyond the optimized area. Chao recreated the plot of 9 spots where<br>
+
−
all spots are within the optimized area. The discrepancy is smaller but still noticeable. <br>
+
−
***Tried to use Min's latest no raster snake model to create the 9-spot-plot. (Jixie, Min and Chao also<br>
+
−
tried several other snake models.) It turns out that 1) the raster is not the reason and <br>
+
−
2) all SNAKE models have this discrepancy.<br>
+
−
***Per Vince's suggestion, a comparison of the reconstruction from real focal plane data to the<br>
+
−
target plane was made between SNAKE backward model and real optics database. <br>
+
−
 
+
−
*Jixie:
+
−
**Present the study of mapping for 5T target field. See the slices [http://hallaweb.jlab.org/experiment/g2p/collaborators/jixie/20121204_Mapping/mapping.pdf here].<br>
+
−
***Jixie studied mapping on focal plane with 4-D grid (x-theta-y-phi) with the bin width of 5mm-5mr-5mm-5mr <br>
+
−
and also with a smaller grid 2mm-2mr-2mm-2mr. It turns out that no matter how small the grid is, the width<br>
+
−
of the theta,phi distribution in target plane are very wide. If considering he CPU time it cost to run simulation,
+
−
5-5-5-5 binning is practicable.<br>
+
−
***Studied the mapping in the sieve plane (need to use straight through reconstruction to reconstruct to the<br>
+
−
target plane then project to sieve). Tried 2 binning:  2mm-2mr-2mm-2mr and 1mm-1mr-1mm-1mr. When decrease the <br>
+
−
grid size, z,y,phi distribution in the target plane become narrower but no the theta distribution. The CPU time<br>
+
−
cost for 2-2-2-2 is acceptable.<br>
+
−
***Need to weight by world XS database to determine the mean value for a given unweighted distribution. <br>
+
−
 
+
−
*Melissa:
+
−
**Presented the study of the cut efficiency of the Cherenkov and lead glass in L-HRS. See details [http://hallaweb.jlab.org/experiment/g2p/collaborators/melissac/Efficiency/Eff_12_04.pdf here]. <br>
+
−
 
+
−
 
+
−
----
+
−
 
+
−
==11/27/2012==
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−
Present: Jixie, Vince, Chao, JP, Jie, Min, Kalyan, Karl, Alex, Melissa <br>
+
−
By-Phone: Ryan, Toby, Pengjia <br>
+
−
 
+
−
'''General discussion'''
+
−
 
+
−
*Decided to finish the pass1 calibration by the end of this year. All units should provide necessary information <br>
+
−
to Toby before Christmas. Toby is expected to cook the data by early January. <br>
+
−
 
+
−
*Optics need more man power. Ryan will conduct longitudinal optics soon and Chao will dedicate in running simulation <br>
+
−
to speed up the optics work. <br>
+
−
 
+
−
'''Feature presentation:'''
+
−
 
+
−
*Toby:
+
−
**Working on target analysis scripts. Almost finish the analysis using baseline subtraction method. <br>
+
−
Toby agreed to show the comparison of his result with online result. <br>
+
−
James did some target calibrations before. Karl will follow up with James to find out how much had been done<br>
+
−
and what can be used.  Dustin is also doing some study with the g2p targets. He agrees to provide technical notes.<br> 
+
−
 
+
−
*Ryan:
+
−
**Dead time and scintillator (trigger) efficiency have been added into the mysql database. <br>
+
−
**Will working on the annual report. After that will go back to take over the longitudinal optics from Chao. <br>
+
−
 
+
−
*Pengjia:
+
−
**Had a brief update on the BPM status. Pengjia plan to follow Jixie's suggestion and produce ascii table for each <br>
+
−
run. Later on this table will be inserted to the replay output right after replay finished. There are some concerns <br>
+
−
from JP that such a separate BPM package are difficult to maintain.  The best way, of course, is to put the BPM package<br>
+
−
back into replay, which requires extra work from Pengjia since this BPM package is written with python.  <br>
+
−
See Pengjia's report [http://hallaweb.jlab.org/experiment/g2p/collaborators/pzhu/11282012/beampackage_status_20121127.pdf here].<br>
+
−
 
+
−
*Jie:
+
−
**Updated the pion rejecter calibration. This time Jie only use P0>1.2 GeV/c data to extract the calibration constant, <br>
+
−
which provide a consistent result between 5T and 2.5 data set. Jie also studied the Cherenkov cut efficiency. See details [http://hallaweb.jlab.org/experiment/g2p/collaborators/jie/2012_11_27_pssh_lhrs/2012_11_26_pion_rejector.pdf here]<br>
+
−
 
+
−
*kalyan:
+
−
**Summarized the analysis status. See details [https://userweb.jlab.org/~kalyan/g2p/meetings/g2p_analysis_flow_27Nov2012.pdf here].<br>
+
−
 
+
−
----
+
−
 
+
−
==11/20/2012==
+
−
Present: Jixie, Vince, Chao, JP, Jie, Min, Kalyan, Karl <br>
+
−
By-Phone: Ryan, Toby, Pengjia <br>
+
−
 
+
−
'''Feature presentation:'''
+
−
*Pengjia:
+
−
**BPM calibration for NONE target field data is ready to use. Python codes to calculate beam positions <br>
+
−
and merge them into the ntuple are ready. Please refer to [http://hallaweb.jlab.org/experiment/g2p/collaborators/pzhu/11202012/beampackage_for_g2p.pdf Pengjia's talk] for instruction. <br>
+
−
**Toby agreed to modify the job scripts to run BPM calibration after replaying. <br>
+
−
 
+
−
*Chao:
+
−
**Added real-reconstruction module into Geant4 simulation program, HRSMC. This module can reconstruct focal<br>
+
−
plane hits back to target plane using the optics database optimized from the experimental optics data. This module<br>
+
−
will help a lot in comparing simulated data with real experimental data.<br>
+
−
**Chao present some figures about the comparison of the reconstructed result from snake model with that <br>
+
−
reconstructed from database. Currently they do not agree with each other. We have no idea which one is correct.<br>
+
−
Need to find out. See his talk [http://hallaweb.jlab.org/experiment/g2p/collaborators/chao/20121120 here].<br>
+
−
 
+
−
*Min:
+
−
**Created 400016 L-HRS no target field snake model. This model have been included into HRSMC. <br>
+
−
**Did the first trial to optimized Ytg reconstruction using the built BPM in the ntuple. These BPM information<br>
+
−
are totally unreliable. Min agreed to put nominal beam positions or Pengjia's calibrated values and try again. <br>
+
−
See details [http://hallaweb.jlab.org/experiment/g2p/collaborators/mhuang/112012/11202012.pdf here].<br>  
+
−
 
+
−
 
+
−
----
+
−
 
+
−
==11/13/2012==
+
−
Present: Jixie, Vince, Chao, Melissa, Jie, Min <br>
+
−
By-Phone: Ryan, Toby, Pengjia <br>
+
−
 
+
−
'''Feature presentation:'''
+
−
*Ryan:
+
−
**present the updates in trigger efficiency, see details [https://userweb.jlab.org/~rbziel/Weekly_Meetings/Trigger_111312.pdf here].<br>
+
−
 
+
−
*Toby:
+
−
**Updated the target analysis [https://hallaweb.jlab.org/wiki/index.php/G2p_Target_Summary results] in the wiki. <br>
+
−
**Writing the script to apply the calibration constant to each run.<br>
+
−
 
+
−
*Jie:
+
−
**Cross checked the preshower|shower calibration. Verified that the discrepancy are due to the target<br>
+
−
field. But Jie's [http://hallaweb.jlab.org/experiment/g2p/collaborators/jie/2012_11_12_pssh_lhrs/2012_11_12_pion_rejector.pdf result] still have this discrepancy in his calibration. There is still some room to improve. <br>
+
−
 
+
−
----
+
−
 
+
−
==11/06/2012==
+
−
Present: Jixie, Vince, Alex, Chao, Melissa, Jie, Kalyan, JP, Min, Karl <br>
+
−
By-Phone: Ryan, Toby, Pengjia <br>
+
−
 
+
−
'''Feature presentation:'''
+
−
 
+
−
*Pengjia:<br>
+
−
**Presented [http://hallaweb.jlab.org/experiment/g2p/collaborators/pzhu/11062012/bpm_status_20121106.pdf the BPM calibration]. <br>
+
−
In this trial Pengjia use Minuit to fit for the calibration constants a,b,c. 
+
−
 
+
−
*Chao: <br>
+
−
**Presented the optics [http://hallaweb.jlab.org/experiment/g2p/collaborators/chao/20121106 optimization result] for 5T Longitudinal field for L-HRS. At this version Chao select <br>
+
−
only the ground state C12 elastic events for each hole. Hole #65 and #46 are exclude since their dP distribution<br>
+
−
look weird.  Will include these 2 holes at the 2nd iteration. <br>
+
−
**Ytg optimization is not done yet. Will try to do it use Pengjia's current calibration result.<br>
+
−
 
+
−
*Min: <br>
+
−
**Created SNAKE model for left HRS with 5T longitudinal target field and 400016 septum. <br>
+
−
**Presented the [http://hallaweb.jlab.org/experiment/g2p/collaborators/mhuang/110612/ straight through optics result] for Right HRS. <br>
+
−
**Will try Ytg calibration later. <br>
+
−
 
+
−
*Melissa:<br>
+
−
**Present [http://hallaweb.jlab.org/experiment/g2p/collaborators/melissac/PionRejectorCalib/PRCalib_11_06.pdf Preshower|Shower calibration]. <br>
+
−
Melissa showed that tr.y distribution have some obvious difference for 2.5T and 5T target fields, which indicate<br>
+
−
that the target field is the reason cause the discrepancy in Edep/P0 between 2.5T data set and 5T data set. <br>
+
−
Melissa adjust the calibration for the 5T data set. The result looks good. After calibration, the energy resolution <br>
+
−
of the pion rejector can reach 20% for 0.5 GeV electron, or 7% for 1 GeV electron, or 3% for 2 GeV electron. <br>
+
−
 
+
−
----
+
−
==10/30/2012==
+
−
Present: Jixie, Alex, Chao, Melissa, Jie, Kalyan, JP, Min <br>
+
−
By-Phone: Ryan, Toby, Pengjia <br>
+
−
 
+
−
'''Feature Presentations:<br>
+
−
 
+
−
*Toby: <br>
+
−
** Updated on TE calibrations analysis. Need to understand fluctuations in TE calibration constants(sometimes ~10-20%) <br>
+
−
** Trying to figure out how to combine different constants for a given sample ( take average, for eg.)
+
−
 
+
−
*Jie: <br>
+
−
** Showed 2.2 GeV RHRS calibration for the shower+preshower.
+
−
** There is difference in E/p value for same momentum taken at different target fields(2.5 T vs 5T).
+
−
** trying to understand where the difference is coming from. Need to look at a no field run to understand the acceptance
+
−
 
+
−
*Pengjia :<br>
+
−
** Still working on BPM calibration. Will present a more detailed report next week.
+
−
 
+
−
----
+
−
==10/23/2012==
+
−
Present: Karl, Jixie, Alex, Chao, Melissa, Jie, Kalyan, JP <br>
+
−
By-Phone: Ryan, Toby, Pengjia, Min <br>
+
−
 
+
−
 
+
−
'''General Discussion:<br>
+
−
 
+
−
 
+
−
'''Feature Presentations:<br>
+
−
 
+
−
*Melissa: <br>
+
−
**Updated the preshower|shower calibrationfor LHRS. Saw the same discrepancy between the 2.5T <br>
+
−
target field data set and the 5T dta set. She tried 3 methods but none will remove the <br>
+
−
discrepancy. See details [http://hallaweb.jlab.org/experiment/g2p/collaborators/melissac/PionRejectorCalib/PRCalib_10_23.pdf here].
+
−
 
+
−
*Chao:<br>
+
−
**Present the optics [http://hallaweb.jlab.org/experiment/g2p/collaborators/chao/20121023/Chao_WeeklyMeeting_10232012.pdf optimization status for the longitudinal target field data set]. <br>
+
−
Chao selected clean sieve hole events with cuts on Y_tg, Phi_tg, Theta_tg and dP. The optimized result<br>
+
−
looks OK, but still has rooms to be improved. This data set might have issues of aligning some sieve <br>
+
−
spots into a wrong hole. <br>
+
−
**Some suggestions were given to Chao: <br>
+
−
#Select very clean sieve data:  only ground state elastic data, remove confusing areas<br>
+
−
#Try to identify the sieve hole for each spot to avoid signing to a wrong hole<br>
+
−
#Simulation could help<br>
+
−
 
+
−
*Min: <br>
+
−
**Updated [http://hallaweb.jlab.org/experiment/g2p/collaborators/mhuang/10232012/10232012.pptx the optimization result on NO target field data] (the coil located at 6 degrees).  <br>
+
−
**Very clean data sample: used Y_tg instead of Z to cut the data. applied cuts on Y_tg-Phi_tg and Theta_tg-dP, <br>
+
−
which is similar to what Chao was using, but exclude the excited state elastic events from each hole. <br>
+
−
**The result looks OK.
+
−
 
+
−
----
+
−
==10/16/2012==
+
−
Present: Karl, Jixie, Alex, Min, Melissa, Jie, Kalyan, JP <br>
+
−
By-Phone: Ryan, Toby, Pengjia, Chao <br>
+
−
 
+
−
'''General Discussion:<br>
+
−
Next Hall A collaboration meeting will be held in Dec 10 to Dec 12. G2p will give <br>
+
−
three presentations.  Melissa will present general physics topic, Jixie will present <br>
+
−
the simulation of G2p in the analysis workshop, Min will also give a talk about the <br>
+
−
optics from real data. <br>
+
 
   
 
   
−
 
−
'''Feature Presentations:<br>
 
−
*Ryan:
 
−
** Working on trigger efficiency, see details [https://userweb.jlab.org/~rbziel/Weekly_Meetings/g2p_101612_meeting.pdf here] <br>
 
−
 
−
*Toby:
 
−
** Working on target analysis. Applying the standard method through all TEs.  <br>
 
−
** Writing scrips to extract the calibration constants and apply them in the analysis.<br>
 
−
Toby will also compare the results to the online results from James. <br>
 
−
 
−
*PengJia:
 
−
** Updated [http://hallaweb.jlab.org/experiment/g2p/collaborators/pzhu/10162012/BPM%20report_20121016.pdf BPM calibration]. <br>
 
−
Pengjia pick 3 calibration points from the samples (5-7 points for each setting) to calculate <br>
 
−
constant a,b and c. Then he compared the BPM pattern from one group to another. <br>
 
−
** Will try to use TMinuit to fit all data points for a, b and c. Jp suggested adding a weighting <br>
 
−
factor to each data point. How to weight the data point is not clear yet. Need to find out. <br>
 
−
 
−
*Jie:
 
−
** Updated the LHRS pion rejector calibration. See details [http://hallaweb.jlab.org/experiment/g2p/collaborators/jie/LHRS_pion_rejector_3.pdf here]. <br>
 
−
 
−
*Jixie:
 
−
** Show [http://hallaweb.jlab.org/experiment/g2p/collaborators/jixie/20121016_OpticsInHRSMCUpdate/g2p_optics_sim_20121008.pdf updates of the optics reconstruction in simulation].  <br>
 
−
*** A new snake model with 3cm raster size available, Y_tg resolution has been improved a lot. <br>
 
−
*** Applied correction to get effective BPM vertical position when target field is on. <br>
 
−
*** Applied energy loss correction <br>
 
−
*** The reconstruction strategy proposed by Jixie has to face the fact that vertex Z have large<br>
 
−
uncertainty. Need to find out a cut to select data within 10 mm from the target end plane in <br>
 
−
order to keep the uncertainty of the scattering angle below 1.5 mrad, which is required to <br>
 
−
achieve 5% uncertainty in the absolute cross section.<br>
 
−
 
−
----
 
−
==10/9/2012==
 
−
Present: Karl, Vince, Alex, Chao, Min, Melissa, Jie, Kalyan, JP <br>
 
−
By-Phone: Ryan, Toby, Pengjia <br>
 
−
 
−
'''General Discussion:<br>
 
−
See agenda for [https://hallaweb.jlab.org/wiki/index.php/G2p_Weekly_Analysis talks]
 
−
 
−
'''Feature Presentations:<br>
 
−
*Melissa Cummings:
 
−
** Working on the LHRS lead-glass calibration <br>
 
−
** Currently looking at 1 pass data calibration(see agenda for the talk) <br>
 
−
** First round calibration gives 7% resolution for E0=2.2 GeV and p0=1.0GeV/c <br>
 
−
 
−
*Chao Gu:
 
−
** Updated on optimization of longitudinal optics runs using 2.2 GeV sieve data
 
−
 
−
*Min Huang:
 
−
** Updated on straight through optics for LHRS (good septum condition)
 
−
** Used different order for matrix, used react z cuts (maynot be right variable to cut, will try tgt_y)
 
−
 
−
----
 
−
==10/2/2012==
 
−
Present: Vince, Alex, Pengjia, Chao, Min, Melissa, Jie, Kalyan, Jixie,  <br>
 
−
By-Phone: Karl, Ryan, Toby, Pengjia <br>
 
−
 
−
'''General Discussion:<br>
 
−
 
−
 
−
'''Feature Presentations:<br>
 
−
*Toby:
 
−
1) Toby did target analysis with baseline subtraction method, the standard method <br>
 
−
James and others are using. His [http://hallaweb.jlab.org/experiment/g2p/collaborators/toby/target/10_2_12_meeting.pdf results] agree with the on-line results from James. <br>
 
−
He has finished 4 TEs, 55 TEs to go. <br>
 
−
 
−
*Ryan:
 
−
1) Learning and preparing to calibrate S1 and S2, will do trigger efficiency then. <br>
 
−
 
−
*Pengjia:
 
−
1) Present [http://hallaweb.jlab.org/experiment/g2p/collaborators/pzhu/10022012/BPM%20report_20121002.pdf the status of BPM calibration]. Pengjia tried to make the distorted pattern of BPM <br>
 
−
look more like a circle. So for no improvement yet. The calibration constant A, B and C were <br>
 
−
calculated with 3 calibration points. 2 suggestions were given to Pengjia: <br>
 
−
A) Use Minuit to fit A,B and C since there are 7 calibration points <br>
 
−
B) Look at a small region that are covered by calibration points to check if its pattern looks<br>
 
−
like a circle. <br>
 
−
 
−
*Jie:
 
−
1) LHRS pion rejector calibration. See details [http://hallaweb.jlab.org/experiment/g2p/collaborators/jie/2012_09_30_pssh/LHRS_pion_rej.pdf here].
 
−
 
−
----
 
−
==09/25/2012==
 
−
Present: Vince, JP, Alex, Pengjia, Chao, Min, Melissa, Jie, Kalyan, Jixie, Karl <br>
 
−
By-Phone: Ryan, Toby, Pengjia <br>
 
−
 
−
'''General Discussion:<br>
 
−
 
−
Data analysis status and plan:
 
−
 
−
We almost reach our initial goal to finish detector calibration by the end of fall. <br>
 
−
Run database is ready. VDC, Cherenkov calibration are finished, BCM, lead glass <br>
 
−
calibrations are very near to the end. Target field measurement analysis, helicity <br>
 
−
decoding are also finished. The target polarimetry analysis, straight through optics <br>
 
−
optimization and BPM calibration are in progress.  However, the calibration for scintillators<br>
 
−
S1 and S2 have not been started. Optics for other data sets have not been touched yet.<br>
 
−
 
−
Optics optimization will dominate the time scale.  In this meeting, we decided to let Ryan<br>
 
−
to finish the S1 and S2 calibrations first, then join back to optics group to cross check<br>
 
−
the result.  At the same time, Min and Chao will work together to do the optimization, one<br>
 
−
for the no target field data set and the other for longitudinal target field data set. <br>
 
−
 
−
 
−
'''Feature Presentations:<br>
 
−
 
−
*Melissa:
 
−
1) Melissa gave updates on the preshower/shower  [http://hallaweb.jlab.org/experiment/g2p/collaborators/melissac/PionRejectorCalib/PRCalib_09_25.pdf calibration].  <br>
 
−
She applied tighter cuts to selectron electron, and looked into Etot/P distribution,<br>
 
−
checked the stability of the calibration constants and showed a plot of the momentum resolution<br>
 
−
provided by the preshower/shower detector. <br>
 
−
 
−
*Min:
 
−
1) Min presented her latest optimization [http://hallaweb.jlab.org/experiment/g2p/collaborators/mhuang/092512/09252012.pptx result] for LHRS straight through Optics. <br>
 
−
She choose 100 events from each hole, increased the order of some variables when fitting<br>
 
−
the tensor for Theta_tg.  These changes improve the result a lot, but there are still two holes<br>
 
−
closed to the beam line does not line up to the expected position. She will keep working on it.<br>
 
−
 
−
*Jixie:
 
−
1) Presented [http://hallaweb.jlab.org/experiment/g2p/collaborators/jixie/20120925_OpticsInHRSMC/g2p_optics_sim.pdf the event reconstruction in the simulation]. <br>
 
−
 
 
*Chao:
 
*Chao:
−
1) Presented how the uncertainty propagated when convert theta_tr, phi_tr in transport <br>
+
** Working on compare the 1st order matrix element between REAL DB and SANKE backward matrix. <br>
−
coordinate system into lab coordinate system. See details [http://hallaweb.jlab.org/experiment/g2p/collaborators/chao/20120925/uncertainty.pdf here]. <br>  
+
  
−
*Kalyan:
 
−
1) Showed [http://hallaweb.jlab.org/experiment/g2p/collaborators/kalyan/g2p_analysis_flow.pdf the analysis flow chart]. <br>
 
−
 
−
----
 
−
==09/18/2012==
 
−
Present: Vince, JP, Alex, Pengjia, Chao, Min, Melissa, Jie, Kalyan, Jixie, Karl <br>
 
−
By-Phone: Ryan, Toby, Pengjia <br>
 
−
 
−
'''General Discussion:<br>
 
−
 
−
'''Feature Presentation:<br>
 
−
 
−
*Jie:
 
−
1) Preshower|shower calibration, see details [http://hallaweb.jlab.org/experiment/g2p/collaborators/jie/2012_09_17_lhrs_pssh/LHRS_pion_rejector.pdf here]. <br>
 
−
 
−
*Toby:
 
−
1) Update on the status of target analysis. Toby is trying to a new method to do this analysis. see details [http://hallaweb.jlab.org/experiment/g2p/collaborators/toby/target/9_18_12_meeting.pdf here].<br>
 
−
 
−
*Ryan:
 
−
1) Cross check optics optimization. <br>
 
−
 
−
*Jixie:
 
−
1) Show event reconstruction in simulation. Resolution of reconstructed x,y,theta,phi for both with and without<br>
 
−
target field have been shown. Check plots [http://hallaweb.jlab.org/experiment/g2p/collaborators/jixie/20120918_Reconstruction/here].<br>
 
−
 
−
----
 
−
==09/12/2012==
 
−
Present: Vince, JP, Alex, Pengjia, Chao, Min, Melissa, Jie, Kalyan, Jixie <br>
 
−
By-Phone: Karl, Ryan, Toby <br>
 
−
 
−
'''General Discussion:<br>
 
−
 
−
In order to have Pengjia join this analysis meeting from China, we plan to move this <br>
 
−
meeting to Tuesday 11:00-13:00. Vince will reserve a room. <br>
 
−
 
−
The meeting will be organized in a way that each week there will be 3 presentations<br>
 
−
from 3 students. This week Melissa, Min and Chao will give presentations. So do Ryan,<br>
 
−
Toby and Jie next week. Those who make presentations should update the agenda page before<br>
 
−
the meeting. Will repeat this pattern every 2 weeks. <br>
 
−
 
−
'''Feature Presentation:<br>
 
 
*Melissa:
 
*Melissa:
−
1) Showed the preliminary [http://hallaweb.jlab.org/experiment/g2p/collaborators/melissac/preshower:shower%20calibration.pdf result] for the right HRS pre-shower|shower calibration.<br>  
+
*Update the result of Detector efficiency and Cut efficiency for L-HRS. See her latest result [http://hallaweb.jlab.org/experiment/g2p/collaborators/mhuang/01082013.pdf here]. <br>  
−
2) The low momentum setting for each beam energy need to recalibrate. Melissa agrees to do that<br>
+
will go for the R-HRS later. <br>
  
−
*Min:
+
* Toby:
−
1) Optics optimization result with the following improvement: <br>
+
**Working on replay script. The output ntuple is too big. Students need to discuss and determine what variable should <br>
−
A) no more than 1000 events each hole  <br>
+
be kept.  
−
B) Sample includes dp= +/-3%, +/-2% and 0%, +/-4% not included<br>
+
**Jixie suggested to include the unfinished BPM reconstruction in the cooking train at this moment. To save the time and <br>
−
C) Survey result applied <br>
+
space, do not cook optics runs. <br>
−
See details [http://hallaweb.jlab.org/experiment/g2p/collaborators/mhuang/091212/09122012.pptx here].<br>
+
−
 
+
−
2) Plot shown that data on the top edge are not calibrated well.  Min will try to optimize<br>  
+
−
it again with only 100 events from each hole. In order to have more statistics on the edge,<br>
+
−
she might need to include dp=-4% data into the sample.<br>
+
−
 
+
−
*Chao: 
+
−
1) Put the target field measurement result onto the wiki: check [https://hallaweb.jlab.org/wiki/index.php/G2p_optics here] for details.<br>
+
−
2) Final report can be found [http://hallaweb.jlab.org/experiment/g2p/collaborators/chao/field/TargetFieldMapping.pdf here].<br>
+
−
This field measurement was believed to reach 1% uncertainty. <br>
+
  
  
 
----
 
----
−
==09/05/2012==
 
−
Present: Vince, JP, Alex, Pengjia, Chao, Min, Melissa, Jie, Kalyan, Jixie <br>
 
−
By-Phone: Ryan, Toby <br>
 
−
 
−
'''General Discussion:<br>
 
−
 
−
Pengjia is leaving in Sep. 13. We are going to have a cake party for him next week.<br>
 
−
 
−
In order to have Pengjia join this analysis meeting from China, we plan to move this <br>
 
−
meeting to the morning (9:00-11:00 or 10:00-12:00). Vince will find out the time and <br>
 
−
meeting room. <br>
 
−
 
−
'''Feature Presentation:<br>
 
−
*Pengjia:
 
−
1) BPM calibration [http://hallaweb.jlab.org/experiment/g2p/collaborators/pzhu/09052012/BPM%20report_20120905.pdf status update] <br>
 
−
Pengjia compared 4 methods to reconstruct beam position. <br>
 
−
 
−
*Melissa:
 
−
1) Melissa found some strange behavior of the RHRS VDC distributions. There are 4 peaks on NH3 elastic<br>
 
−
data set. See [http://hallaweb.jlab.org/experiment/g2p/collaborators/melissac/09_05_acceptance.pdf this plot] for details.<br>
 
−
There should be only 2 peaks, one for e-nitrogen elastic and the other for eP elastic events.  This issue <br>
 
−
happened to the data set when the right septum is under 40-32-16 configuration. <br>
 
−
2) Jixie mentioned that the energy difference between the first e-nitrogen peak to the next e-nitrogen peak is <br>
 
−
about 70 MeV, assuming the momentum reconstruction is right (we know that the momentum reconstruction <br>
 
−
in the plot is valid only for without target field situation).  The scattering angle for these two peaks<br>
 
−
are 5.6 and 9.8 degrees, respectively. <br>
 
−
3) JP suggested that the septum field might fluctuate during the run. <br>
 
−
4) Ryan, Chao checked the date and found that these run were taken right before the septum shorted  <br>
 
−
for the 2nd time which caused the 2nd failure. Melissa agrees to check the magnet history using the epics <br>
 
−
variable record. <br>
 
−
5) Melisa also agreed to make a list of the run numbers which have this issue and provide it to Ryan for updating <br>
 
−
the mysql database. <br>
 
−
 
−
*Chao:
 
−
1) Working on analyzing target field measurement data. Have some preliminary results [http://hallaweb.jlab.org/experiment/g2p/collaborators/chao/20120905/ here]<br>
 
−
The field was measured on 4 pieces of grid paper. The measured Br( in the direction perpendicular<br>
 
−
to the chamber surface) agree with the Tosca model very well (most of them are within 1% and some of them are within 2%).<br>
 
−
Check the xls file for detail. Chao will give a final report net week. <br>
 
−
 
−
 
−
'''Status Updates:<br>
 
−
*Jixie:
 
−
1) Working with simulation to find out if we can do focal plane to sieve plane reconstruction.<br>
 
−
There is some issues going on with the SNAKE model in the G4 code, see here for [http://hallaweb.jlab.org/experiment/g2p/collaborators/jixie/20120905_SnakeIssue/ details].<br>
 
−
 
−
*Ryan:
 
−
1) Updated the web interface page for the mysql database <br>
 
−
 
−
*Toby:
 
−
1) Cross check on raster reconstruction. One plot is posted [http://hallaweb.jlab.org/experiment/g2p/collaborators/toby/bpm/raster2.png here] for the BPM current and raster patter<br>
 
−
 
−
*Min:
 
−
1) The analyzer database was posted on the wiki [https://hallaweb.jlab.org/wiki/index.php/G2p/analyzerdb here]. <br>
 
−
2) working on optics optimization<br>
 
−
 
−
*Jie:
 
−
1) working on shower and pre-shower calibration. <br>
 
−
 
−
----
 
−
==08/29/2012==
 
−
Present: Jixie, JP, Min, Melissa, Kalyan, Pengjia, Alex, Jie, Vince, Chao <br>
 
−
By-Phone: Ryan, Toby <br>
 
−
 
−
'''General Discussion:<br>
 
−
 
−
 
−
'''Feature Presentation:<br>
 
−
*Pengjia & Alex:
 
−
1) BPM calibration [http://hallaweb.jlab.org/experiment/g2p/collaborators/pzhu/08292012/BPM%20report_20120829.pdf status update] <br>
 
−
Pengjia is working hard to find a formula for beam position reconstruction. <br>
 
−
2) Alex posted the heat capacity measurements for the tungsten calorimeter in the elog,[https://hallaweb.jlab.org/dvcslog/g2p/173 entry 173]<br>
 
−
The result shows that the relative standard deviation of heat capacity (measured by RTD) is 0.15%. <br>
 
−
 
−
'''Status Updates:<br>
 
−
 
−
*Ryan:
 
−
1) working on optics for cross check, adding missing info to mysql database <br>
 
−
 
−
*Toby:
 
−
1) working on raster reconstruction, cross check Pengjia's work<br>
 
−
 
−
*Min:
 
−
1) finished splitting db_run. <br>
 
−
2) working on optics <br>
 
−
 
−
*Melissa & Jie:
 
−
1) Cross checked the CherenKov calibration. Showed the final [http://hallaweb.jlab.org/experiment/g2p/collaborators/melissac/CherenkovCalib/CerCalib_08_29.pdf results]. <br>
 
−
The single photon electron peak from the results presented last week was the maximum value. <br>
 
−
It was just misspoke in previous meeting. <br>
 
−
2) Both will move on to do shower and pre-shower calibration. <br>
 
−
 
−
*Chao:
 
−
1) working on analyzing target field measurement data. <br>
 
−
 
−
 
−
 
−
----
 
−
==08/22/2012==
 
−
Present: Jixie, JP, Min, Melissa, Kalyan, Pengjia, Alex, Jie, Vince <br>
 
−
By-Phone: Ryan, Karl, Toby <br>
 
−
 
−
'''General Discussion:<br>
 
−
 
−
'''Feature Presentation:<br>
 
−
*Melissa & Jie:
 
−
1) Melissa showed her Cherenkov calibration for the right arm, see details [http://hallaweb.jlab.org/experiment/g2p/collaborators/melissac/CherenkovCalib/CerCalib_08_22.pdf here] <br>
 
−
2) Jie pointed out that Melissa is using the most probable value from the gauss*landau fit. <br> 
 
−
While we had concluded that the maximum value should be used in the past. After rechecking Jie's fitting result table, <br>
 
−
there seems to be some puzzle in the label or the physical meaning of some variables. Jie and Melissa<br>
 
−
agreed to double check their results and give a final report in the next meeting.<br>
 
−
 
−
*Jixie:
 
−
1) Showed the study on the FZ2 magnetic field at BPM 1H05A and 1H05B location. Jixie concluded that <br>
 
−
the FZ2 field's effect will be less than 4x10^-4, which is negligible.  See details [http://hallaweb.jlab.org/experiment/g2p/collaborators/jixie/talks/FieldAtBPM.pdf here].<br>
 
−
2) Obtained confirmation from the survey group that the report of the grid paper for the target field <br>
 
−
measurement is the right one.  Will analyze the data soon.
 
−
 
−
'''Status Updates:<br> 
 
−
 
−
*Min & Chao:
 
−
1) Min's splitting the left and right db_run from one big file for 'replay' program. <br>
 
−
Because replay only check the time stamp to extract constants from file 'db_run', <br>
 
−
there is a potential issue that right arm reconstruction will read left arm constants <br>
 
−
from db_run if left and right arm constants are in one file. <br>
 
−
2) Chao finished updating the program 'tree2ascii' which is used to select good sieve data.  <br>
 
−
It now selects a given number of events for each sieve hole. <br>
 
−
3) Chao organized the replay program such that all variable leaves will be stored into one tree, <br>
 
−
which is required by program 'tree2ascii'. <br>
 
−
 
−
*Pengjia & Alex:
 
−
1) Working on BPM calibration, the formula to reconstruct position seems not working well.<br>
 
−
2) Alex agreed to get the uncertainty for RTD and also the uncertainty of the heat capacity <br>
 
−
of the Tungsten calorimeter. <br>
 
−
 
−
*Ryan:
 
−
1) The Mysql database is ready! Web interface is also available now. Check [https://hallaweb.jlab.org/experiment/g2p/mysql/ here] for details.<br>
 
−
Jixie suggested to add some descriptions or definitions on the page such that users will know <br>
 
−
what those encoded numbers mean.
 
−
 
−
*Toby:
 
−
1) Crosschecking BPM calibration. <br>
 
−
 
−
----
 
−
==08/15/2012==
 
−
Present: Jixie, JP, Min, Chao, Melissa, Kalyan, Pengjia, Alex <br>
 
−
By-Phone: Ryan, Karl, Toby <br>
 
−
 
−
'''General Discussion:<br>
 
−
 
−
'''Feature Presentation:<br>
 
−
*Melissa:
 
−
1) Checked the Cherenkov calibration for all momentum settings for the left arm. <br>
 
−
Melissa show a nice figure which shows the single photon electron peak averaged <br>
 
−
over 10 PMTs. See details [http://hallaweb.jlab.org/experiment/g2p/collaborators/melissac/CherenkovCalib/CerCalib_08_15.pdf here]. <br>
 
−
2) Will check the right arm soon.
 
−
 
−
*Pengjia:
 
−
1) Working on BPM calibration. In his [http://hallaweb.jlab.org/experiment/g2p/collaborators/pzhu/08152012/bpm_status_08152012.pdf slides] Pengjia showed 3 methods to do<br>
 
−
the BPM reconstruction, but none of them have good linearity.  JP suggested to solve the equation and <br>
 
−
use the analytic solution of it.<br>
 
−
2) Discussed the BPM calibration status. Jixie suggest Pengjia to finish the machinery code for each <br>
 
−
module then improve some of them later. Therefore Pengjia will have the whole project working before he leaves, <br>
 
−
and he can improve it in China. JP suggests Pengjia to finish the most important module then move to the next.<br>
 
−
3) Pengjia asked Toby to cross check the raster shape reconstruction and then perform the fit from the BPMs to Target.
 
−
 
−
'''Status Updates: <br>
 
−
 
−
*Jixie:
 
−
1) Ran simulation to test the focal plane to sieve reconstruction strategy.<br>
 
−
2) Agree to contact Yves for tosca map for FZB2. <br>
 
−
3) Finished up the target field measurement project. Need to ask survey group to provide another survey report.<br>
 
−
 
−
*Toby:
 
−
1) Working on target material analysis. Finished calibration for some of the materials. The material table on<br> the wiki has been updated with the calibrated results. <br>
 
−
2) There is some 5-7 sigma discrepancy between Toby's target analysis result and James's. Toby is trying to <br>
 
−
find out the reason. <br> 
 
−
3) Karl stated that Dustin is still doing g2p target analysis. H e suggested Toby to work with Dustin.<br>
 
−
 
−
*Ryan:
 
−
1) Finished reading logs and building run information. The MYSQL database is ready in his PC. Will setup one<br>
 
−
database on the JLab farm soon.  Web interface will also be available by then.<br>
 
−
2) Relative information will also be posted in the wiki. <br>
 
−
3) will start optics optimization soon. <br>
 
−
 
−
*Min:
 
−
1) Just back from China. Will continue optics work. <br>
 
−
 
−
*Chao:
 
−
1) G2p reconstruction ntuple missing some epics variable due to some mistakes during the run. These epics <br>
 
−
variables can be extract from epics log files. Need to work on the replay to take these variables from the log<br>
 
−
files and insert them into the ntuple. Almost done. <br>
 
−
2) Once 1) is finished, will move on to update optimization program to take equal number of events from each <br>
 
−
hole.<br>
 
−
 
−
 
−
----
 
−
==08/01/2012==
 
−
Present: Jixie, Jie, Melissa, Kalyan, Pengjia, Vince, JP <br>
 
−
By-Phone: Ryan, Karl <br>
 
−
 
−
'''General discussion:<br>
 
−
1) The posters and abstracts for GRC are ready for review. Please send <br>
 
−
your comments to the author ASAP. The final version of the posters and <br>
 
−
abstracts will be posted on the WIKI.<br>
 
−
2) Pengjia and Chao will give talks at the coming Chiral Dynamic conference.<br>
 
−
They will practice their talks This Friday (Aug. 3rd) 2 PM. Vince will find <br>
 
−
a room and send email out. <br>
 
−
3) Vince agreed to conduct the tour to Hall A for the Chiral Dynamic participants <br>
 
−
next Thursday (Aug 8th).
 
−
4) JP is worrying about the optics calibration might slow down the analysis. <br>
 
−
 
−
 
−
'''Status Update: <br>
 
−
 
−
*Ryan:
 
−
1) Finished reading the halog. A TPYE has been signed to each run.  All work is done<br>
 
−
in his PC. Will transfer to Jlab MYSQL database later. Ryan will also write a web <br>
 
−
interface to read the MYSQL database. <br>
 
−
2) Learning how to run optics optimization program. Will work on this soon.<br>
 
−
 
−
*Chao:
 
−
1) Stayed at UVA last week.<br>
 
−
2) Working on optics packages. Trying to select the same number of events from each hole<br>
 
−
to avoid bias in the optimization.<br>
 
−
3) Finished the write up for helicity decoding, see details [https://hallaweb.jlab.org/wiki/index.php/G2p_Helicity_Decoder here]<br>
 
−
4) Preparing slices for CD2012 <br>
 
−
 
−
*Jie & Melissa:
 
−
1) Continue Cherenkov calibration. Jie Scaled the single photo-electron peak to 100( adc channel #). <br>
 
−
He chose to average the whole g2p data set instead of split them into multiple sets. See his result [http://hallaweb.jlab.org/experiment/g2p/collaborators/jie/2012_08_01_Cer/2012_08_01.pdf here]<br>
 
−
2) Melissa check Jie's fitted result with one beam energy data set. The result looks good. The <br>
 
−
calibrated single photon-electron peak are very closed to 100. See [http://hallaweb.jlab.org/experiment/g2p/collaborators/melissac/CherenkovCalib/CerCalib_08_01.pdf here] for details. <br>
 
−
3) Melissa will check for other beam energy data sets.
 
−
 
−
*Pengjia:
 
−
1) BCM calibration is done except the uncertainty. Need to know the uncertainty for the heat <br>
 
−
capacity of the Tungsten Colorimeter.  JP suggested to survey the manufacture for this information.<br>
 
−
2) Working on BPM calibration. Pengjia agreed to present the basic knowledge about the BPM calibration <br>
 
−
in next meeting. He will also post some documents about BPM calibration onto the wiki.
 
−
 
−
 
−
 
−
----
 
−
==7/25/2012==
 
−
Present: Jixie, Jie, Melissa, Kalyan, Pengjia
 
−
By-Phone: Ryan, Toby
 
−
 
−
'''General discussion:<br>
 
−
1)The posters and abstract of Ryan and Melissa is ready for review. Please send <br>
 
−
them your comments.  Toby's is also ready!<br>
 
−
2)Hall A counting house will be renovated soon. Adaql# machine will not <br>
 
−
be accessed from July 26,2012. Please back up your files! <br>
 
−
Jixie has transfered ~adaq/g2p to /w/halla-1/g2p/g2p_at_adaqlX.tar.gz
 
−
 
−
 
−
'''Status Update: <br>
 
−
 
−
*Pengjia: 
 
−
1) Showed BCM calibration procedure. See [http://hallaweb.jlab.org/experiment/g2p/collaborators/pzhu/07252012/bcm_calibration_procedure.pdf this] for detail. <br>
 
−
 
−
*Jie & Melissa:
 
−
1) Fitted the single photon-electron peak with gauss-landau function and compared the result with <br>
 
−
pure gauss fittings. [http://hallaweb.jlab.org/experiment/g2p/collaborators/jie/2012_07_25_Cer/2012_07_25_Cer.pdf Jie's result] provides 2 sets of values: one is <br>
 
−
most likely peak value and the other is maximum peak value. The maximum peak value is very closed to<br>
 
−
the gaussian fitted result (within 2 channels, about 3%).<br>
 
−
It is also very closed to [http://hallaweb.jlab.org/experiment/g2p/collaborators/melissac/CherenkovCalib/GC_compiled.pdf Melissa's result.]
 
−
Kalyan and Jixie suggested to use the maximum peak value in the calibration. <br>
 
−
 
−
*Ryan:
 
−
1) continue working on run information for the mysql database. 1000 runs to go for left arm. Will <br>
 
−
start right arm data after then. <br>
 
−
2) follow up the ccpr about creating mysql server in the jlab farm. <br>
 
−
3) learning optics optimization. <br>
 
−
 
−
*Toby:
 
−
1) abstract of the poster for GRC is ready for review.
 
−
 
−
 
−
 
−
----
 
−
==7/18/2012==
 
−
Present: Jixie, Vince, Jie, Chao, Kalyan, Pengjia
 
−
By-Phone: Karl
 
−
 
−
'''General discussion:
 
−
This meeting starts at 14:30 every Wednesday from next week!
 
−
 
−
'''Status Update: <br>
 
−
 
−
*Chao:
 
−
1) Continue optics analysis. Trying to select 1000 good particles from each hole to do <br>
 
−
the optimization<br>
 
−
2) Finished checking optics run <br> 
 
−
3) Writing a program to insert HALLA:p and HALLA:dpp into the replay ntuple output. <br>
 
−
 
−
*Pengjia:
 
−
1) BCM calibration is finished. A python code is ready to extract BCM calibration constants <br>
 
−
for a given run number.  Here is Pengjia's original words:
 
−
 
−
''Hi Everyone, <br>
 
−
I built a python class to get the bcm constant, you can find the code in:
 
−
/w/halla-1/g2p/codeshare/bcm/bcmconst.py  <br>
 
−
You just need to give it run number, device(sis3800,sis3801 or happex),upstream or downstream, clocktype(fast or slow clock), you can find the example and usage in that code(__main__ part).
 
−
This code will read bcm constant from the spreadsheet which I posted in wiki one to two months ago(in https://hallaweb.jlab.org/wiki/index.php/G2p_BCM_calibration), you can  assign filename, or it will automatic download the file from the wiki.<br>
 
−
Also you will need to download odsread.py file in the same directory(/w/halla-1/g2p/codeshare/bcm/odsread.py) which I wrote for reading ods file(openoffice spreadsheet), you can also use it to read any other ods files.
 
−
If you find any bugs please let me know.
 
−
Thanks!<br>
 
−
Pengjia''
 
−
<br>
 
−
 
−
2) Continue working on BPM calibration <br>
 
−
 
−
*Jie:
 
−
1) Applied a different TDC cut (which will remove the peak TDC) before fitting the single photon <br>
 
−
electron position. This cut removes the plateaus in the photon-electron distribution. <br>
 
−
This result is posted here[Cerenkov SPE peak calibration http://hallaweb.jlab.org/experiment/g2p/collaborators/jie/2012_07_18_Cer/Cerenkov.pdf]. Kalyan suggested to add landau tail to the fit <br>
 
−
which might improve the result. Jie agrees to try this and cross check with Melissa's result<br>
 
−
 
−
----
 
−
==7/3/2012==
 
−
Present: Jixie, Vince, Ryan, Melissa, Jie, Alex, Chao, Toby, Kalyan, Pengjia, Min
 
−
By-Phone: Karl
 
−
 
−
'''General discussion:
 
−
No meeting for next week!
 
−
 
−
'''Status Update: <br>
 
−
 
−
*Ryan:
 
−
1) Working on reading HaLogs and assigning run type for every run  <br>
 
−
2) Reported that the HWP status in the epics file tripped quite often (flip within seconds)  <br>
 
−
But there are plenty of solutions to achieve the status of HWP for a run. <br>
 
−
 
−
*Min:
 
−
1) Working on improving the optimization. Will apply the following: <br>
 
−
A) Select events from all of the holes if possible <br>
 
−
B) Equally weight each hole <br>
 
−
C) Add delta=+/- 3% data events into the optimization table <br>
 
−
 
−
*Chao:
 
−
1) Creating a table which will describe the detail information for all optics runs <br>
 
−
2) The name of two optics summary file are wrongly labeled. Jixie will fixed it. <br>
 
−
 
−
*Jie:
 
−
1) Worked on Cherenkov calibration. In fitting the single phone electron peak, he found that <br>
 
−
there are about 10 ADC channel difference between a Gaussian fit and Gaussian+pol3 fit. <br>
 
−
Melissa and Jie will cross check there work.<br>
 
−
 
−
*Melissa:
 
−
1) Optimizing the fit for signal photon electron peak <br>
 
−
2) Working on extracting the efficiency for left and right PMTs in Left HRS<br>
 
−
 
−
*Toby:
 
−
1) Wrote a script to determine the average target polarization for a given run <br>
 
−
Karl suggested to look at the change of polarization within a run, trying to remove<br>
 
−
bad|junk events<br>
 
−
2) Crossing check Pengjia's Harp data calibration <br>
 
−
 
−
*Pengjia:
 
−
1) Rewriting the program to calibrate BPM, still need to contact John for N15 BPM drawings<br>
 
−
 
−
----
 
−
==6/27/2012==
 
−
Present: Jixie, Vince, Ryan, Melissa, Jie, JP, Chao, Toby, Kalyan, Pengjia
 
−
By-Phone: Karl
 
−
 
−
'''Feature Presentation: <br>
 
−
1) Melissa: [http://hallaweb.jlab.org/experiment/g2p/collaborators/melissac/CherenkovCalib/MAC_06_27.pdf Cherenkov Calibration)] <br>
 
−
A) Isolated single photon-electron peak with cuts. <br>
 
−
JP suggested to fit with double peak function for some PMTs <br>
 
−
B) Checked consistency <br>
 
−
C) TODO: stability check and efficiency calculation <br>
 
−
 
−
2) Min|Jixie: [http://hallaweb.jlab.org/experiment/g2p/collaborators/mhuang/06262012/06262012.pptx Left HRS straight through optics calibration] <br>
 
−
A) dp calibration shown <br>
 
−
B) theta,phi angle calibration shown, still need to improve: will cut VZ out and <br>
 
−
select equal number of events from each hole to avoid bias.<br>
 
−
 
−
3) Chao: Report [http://hallaweb.jlab.org/experiment/g2p/collaborators/chao/20120627  the helicity decoder status].
 
−
 
−
 
−
'''Status Update:<br>
 
−
*Toby:
 
−
1) Continue the TE analysis <br>
 
−
 
−
*Ryan:
 
−
1) checking halogs for run information. Will update the mysql database. 
 
−
 
−
*Pengjia:
 
−
1) check epics data for HALLA:p, no data lost.  Have scripts ready to extract <br>
 
−
epics values and insert them into root file<br>
 
−
2) BPM calibration: <br>
 
−
A) Need survey data of the longitudinal setting. Already contact survey group <br>
 
−
B) Asked John to provide engineering drawing for the N15 BPM <br>
 
−
C) Will transfer Yves's trajectories into Hall A coordinate system <br>
 
−
 
−
*Jie:
 
−
1) Continue working on Cherenkov calibration
 
−
 
−
 
−
----
 
−
==6/20/2012==
 
−
Present: Jixie, Min, Pengjia, Melissa, Jie, Alex, JP, Chao, Toby, Kalyan, Ryan, Vince
 
−
By-Phone: Karl
 
−
 
−
'''Feature Presentation: <br>
 
−
1) Toby: [http://hallaweb.jlab.org/experiment/g2p/collaborators/toby/target/toby0320.pdf Target_analysis_update)]  <br>
 
−
TE analysis is done for one point, details is shown in the above link, 39 points to go<br>
 
−
 
−
2) Chao: Updating db_run.dat, see details [http://hallaweb.jlab.org/experiment/g2p/collaborators/chao/20120620 here].
 
−
A) Reported that 'end of run time' can be accessed with 3 methods, some methods do not work.<br>
 
−
Vince suggested to also look into event type 100 in the raw data file. <br>
 
−
B) Averaged epics variables in a run by run manner <br>
 
−
C) HALLA:p is missing in the raw data. It sometimes even disappeared in the epics files. Pengjia will look<br>
 
−
into this.<br>
 
−
D) Removed helicity decoder from replay. Will do the helicity replay separately and store the result <br>
 
−
into a table. This table will be inserted into the output ntuple each time the replay is running. <br>
 
−
 
−
'''Status Update:<br>
 
−
 
−
*Jie:
 
−
1) doing an independent check of the Cherenkov calibration. Working on A)the pedestal for each PMT <br>
 
−
and B)Align single photo-electron peak for each PMT. <br>
 
−
 
−
*Ryan:
 
−
1) Average the epics variable in a run. Can cross check with Chao's result <br>
 
−
2) Sign a flag to each run based on all information(from student log, shift workers' log,etc...) <br>
 
−
 
−
*Melissa:
 
−
1) Checking the consistency of the Cherenkov calibration. <br>
 
−
 
−
*Min:
 
−
1) Checked materials and thickness that an incoming electron and an outgoing electron will go through,<br>
 
−
reports posted in the [https://hallaweb.jlab.org/dvcslog/g2p/172 elog entry 172] <br>
 
−
2) Put the survey information into the program and optimize straight through optics <br>
 
−
 
−
*Pengjia:
 
−
1) Split the halog by author such that it will be convenient for searching. New halog is posted [http://hallaweb.jlab.org/experiment/g2p/collaborators/pzhu/wiki/halog/ here]. <br>
 
−
2) Will check the epics for missing variable issue. <br>
 
−
3) Working on BPM calibration.<br>
 
−
 
−
*Jixie:
 
−
1) Organized [http://hallaweb.jlab.org/experiment/g2p/survey/ the survey web]. Talked with Jim for the right HRS survey which is done before the <br>
 
−
experiment. The report for the HRS survey done after experiment is ready. Sieve and local dump survey<br>
 
−
was done this Monday and the report are in progress.
 
−
 
−
 
−
----
 
−
==6/12/2012==
 
−
Present: Jixie, Min, Pengjia, Melissa, Jie, Alex, JP, Chao, Toby, Ryan, Vince, Kalyan
 
−
By-Phone:
 
−
 
−
'''Feature Presentation: <br>
 
−
1) Min: [http://hallaweb.jlab.org/experiment/g2p/collaborators/mhuang/epics/ analysis database (run information table)]  <br>
 
−
Beam energy, start time, P0, Theta0 for each run have been written into the table <br>
 
−
107 runs are still missing. Chao will take care of these runs. <br>
 
−
 
−
2) Jie: Finished [http://hallaweb.jlab.org/experiment/g2p/collaborators/jie/2012_06_12_VDC_T0/ VDC T0 calibration].
 
−
 
−
'''Status Update:<br>
 
−
 
−
*Ryan:
 
−
1) Updated target_encoder, HWP status, prescale factors in the mysql database. See details [https://hallaweb.jlab.org/wiki/index.php/G2pmysql here]. <br> 
 
−
 
−
*Pengjia:
 
−
1) BPM: obtained noise for every gain setting <br>
 
−
2) BCM: Gain is unstable before March 10. Need absolute uncertainty of calibration. Alex will look into it. <br> 
 
−
 
−
*Toby:
 
−
1) Picking out good TE measurements. Match TE points to the right material. Will do new fits. <br>
 
−
2) Updated [http://hallaweb.jlab.org/experiment/g2p/target/ target log book] on the wiki. <br>
 
−
 
−
*Chao:
 
−
1) Improved helicity decoder <br>
 
−
2) Will prepare run information table for further analysis <br>
 
−
 
−
*Melissa:
 
−
1) Working on Cherenkov calibration <br>
 
−
 
−
 
−
----
 
−
==5/30/2012==
 
−
Present: Jixie, Min, Pengjia, Melissa, Jie, Xiaochao, JP, Chao, Toby, Melissa
 
−
By-Phone: Karl, Guy
 
−
 
−
'''General discussion (JP, Karl, ...): <br>
 
−
1) [http://www.jlab.org/conferences/CD12/ Chiral Dynamics Workshop] will be held at Jlab in Aug 6-10. The deadline for submission is June 1. <br>
 
−
Please submit abstract. <br>
 
−
2) [http://www.grc.org/programs.aspx?year=2012&program=photonuc Gorden conference] will take place at the
 
−
same time. Submit abstract before deadline! <br>
 
−
3) G2P group will give 3 talks for the [http://hallaweb.jlab.org/collab/meeting/2012-summer/agenda.pdf Hall-A collaboration meeting ]. <br>
 
−
We will meet next Wednesday 13:00-15:00 to practice the talks and giving feed-back. <br>
 
−
Jixie has reserved L207. (Jun 6, 13:00 - 15:00). <br>
 
−
4) Karl will provide plot|slice material to Bob and Jixie for their talks in Hall A collaboration meeting.
 
−
 
−
'''Feature presentation:<br>
 
−
1) Pengjia: [https://hallaweb.jlab.org/wiki/index.php/G2p_BCM_calibration Preliminary BCM calibration Result]
 
−
 
−
'''Status Update:<br>
 
−
*Guy:
 
−
1) Have analysis meetings in Israel. Analyzing the data. <br>
 
−
2) Need to discuss how to do the dilution factor calculation. <br>
 
−
 
−
*Jixie:
 
−
1) working on optics analysis.
 
−
 
−
*Min:
 
−
1) Calculating the uncertainty of pointing. Discussing with Nilanga about it.
 
−
 
−
*Chao:
 
−
1) Working on helicity reconstruction. Need Pengjia to cross check this when finish. <br>
 
−
2) will cross check BCM calibration soon. <br>
 
−
 
−
*Toby:
 
−
1) Preparing [https://hallaweb.jlab.org/wiki/index.php/TE_Measurement_Table the target material TE table] for target calibration. <br>
 
−
 
−
*Jie:
 
−
1) Working on VDC T0 calibration. Need more statistics to get the result.<br>
 
−
 
−
*Melissa:
 
−
1) Working on CC calibration.
 
  
 
----
 
----

Revision as of 16:43, 8 January 2013

Minutes of the weekly analysis meetings

Agenda


1/8/2013

Present: Jixie, Vince, Jie, Min, Melissa,Chao, JP, Karl
By-Phone: Ryan, Toby, Pengjia

General discussion

  • APS abstract deadline will be this Friday> The deadlines for GHP and INPC are also very

closed. Those who want to attend these conference please prepare the abstract as early as possible.

Feature presentation:

  • Min:
    • Present the Ytg optimization for R-HRS using NO target field data. See details here.
    • Prepare the non-raster SNAKE backward model for Chao.
  • Chao:
    • Working on compare the 1st order matrix element between REAL DB and SANKE backward matrix.
  • Melissa:
  • Update the result of Detector efficiency and Cut efficiency for L-HRS. See her latest result here.

will go for the R-HRS later.

  • Toby:
    • Working on replay script. The output ntuple is too big. Students need to discuss and determine what variable should

be kept.

    • Jixie suggested to include the unfinished BPM reconstruction in the cooking train at this moment. To save the time and

space, do not cook optics runs.


April-Dec 2012

Minutes_Apr2012_to_Dec2012

Jan-March 2012

Minutes_Jan2012_to_Mar2012

July-Dec 2011

Minutes_July2011_to_Dec_2011

Jan-June 2012

Minutes_Jan2011_to_June_2011

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