View source for Minutes Apr2012 to Dec2012



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==12/18/2012== 
Present: Jixie, Vince, Jie, Min, Melissa <br>
By-Phone: Ryan, Toby, Pengjia <br>

'''General discussion'''

NO meetings for  the following 2 weeks.

'''Feature presentation:'''

*Pengjia: 
**Present the status of the BPM calibration. There are some updates in the software package. <br>
**Pengjia need to use the distribution average of the position at BPM A and B to calculate the <br>
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>

*Toby:
**New version of analyzer is released. Trying to switch to the new version. <br> 
**Testing the replay scripts after including the BPM packages. <br> 
**Waiting for calibration constants from other students. <br>

*Ryan:
**Moving back to do optics optimization for RHRS, 5T longitudinal field data set. <br>

*Jixie:
**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> 
location, not the insert! (It was designed to be at the insert.)  Optics and simulation need to take 
this into account.

*Jie:
**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>

*Min:
**Verifying the optimizer is really taking the survey parameters. <br>
**Will run it again once beam position are ready. Then do Ytg calibration. <br>

----

==12/04/2012== 
Present: Jixie, Vince, Chao, Jie, Min, Kalyan, Karl, Melissa <br>
By-Phone: Ryan, Toby, Pengjia <br>

'''General discussion'''

*Dry run talks for the Hall A calibration will be held 1 PM Wednesday. Vince will <br>
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== 
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:
1) Presented how the uncertainty propagated when convert theta_tr, phi_tr in transport <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:
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> 
2) The low momentum setting for each beam energy need to recalibrate. Melissa agrees to do that<br>

*Min:
1) Optics optimization result with the following improvement: <br>
A) no more than 1000 events each hole  <br>
B) Sample includes dp= +/-3%, +/-2% and 0%, +/-4% not included<br>
C) Survey result applied <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.