G2p Analysis Minutes
Minutes of the weekly analysis meetings
08/15/2012: Present: Jixie, JP, Min, Chao Melissa, Kalyan, Pengjia, Alex By-Phone: Ryan, Karl, Toby
General Discussion:
Feature Presentation:
- Melissa:
1) Checked the Cherenkov calibration for all momentum settings for the left arm.
Melissa show a nice figure which shows the single photon electron peak averaged
over 10 PMTs. See details here.
2) Will check the right arm soon.
- Pengjia:
1) Working on BPM calibration. In his slides Pengjia showed 3 methods to do
the BPM reconstruction, but none of them have good linearity. JP suggested to solve the equation and
use the analytic solution of it.
2) Discussed the BPM calibration status. Jixie suggest Pengjia to finish the machinery code for each
module then improve some of them later. Therefore Pengjia will have the whole project working before he leaves,
and he can improve it in China. JP suggests Pengjia to finish the most important module then move to the next.
3) Pengjia asked Toby to cross check the raster shape reconstruction and then perform the fit from the BPMs to Target.
Status Updates:
- Jixie:
1) Ran simulation to test the focal plane to sieve reconstruction strategy.
2) Agree to contact Yves for tosca map for FZB2.
3) Finished up the target field measurement project. Need to ask survey group to provide another survey report.
- Toby:
1) Working on target material analysis. Finished calibration for some of the materials. The material table on
the wiki has been updated with the calibrated results.
2) There is some 5-7 sigma discrepancy between Toby's target analysis result and James's. Toby is trying to
find out the reason.
3) Karl stated that Dustin is still doing g2p target analysis. H e suggested Toby to work with Dustin.
- Ryan:
1) Finished reading logs and building run information. The MYSQL database is ready in his PC. Will setup one
database on the JLab farm soon. Web interface will also be available by then.
2) Relative information will also be posted in the wiki.
3) will start optics optimization soon.
- Min:
1) Just back from China. Will continue optics work.
- Chao:
1) G2p reconstruction ntuple missing some epics variable due to some mistakes during the run. These epics
variables can be extract from epics log files. Need to work on the replay to take these variables from the log
files and insert them into the ntuple. Almost done.
2) Once 1) is finished, will move on to update optimization program to take equal number of events from each
hole.
08/01/2012: Present: Jixie, Jie, Melissa, Kalyan, Pengjia, Vince, JP By-Phone: Ryan, Karl
General discussion:
1) The posters and abstracts for GRC are ready for review. Please send
your comments to the author ASAP. The final version of the posters and
abstracts will be posted on the WIKI.
2) Pengjia and Chao will give talks at the coming Chiral Dynamic conference.
They will practice their talks This Friday (Aug. 3rd) 2 PM. Vince will find
a room and send email out.
3) Vince agreed to conduct the tour to Hall A for the Chiral Dynamic participants
next Thursday (Aug 8th).
4) JP is worrying about the optics calibration might slow down the analysis.
Status Update:
- Ryan:
1) Finished reading the halog. A TPYE has been signed to each run. All work is done
in his PC. Will transfer to Jlab MYSQL database later. Ryan will also write a web
interface to read the MYSQL database.
2) Learning how to run optics optimization program. Will work on this soon.
- Chao:
1) Stayed at UVA last week.
2) Working on optics packages. Trying to select the same number of events from each hole
to avoid bias in the optimization.
3) Finished the write up for helicity decoding, see details here
4) Preparing slices for CD2012
- Jie & Melissa:
1) Continue Cherenkov calibration. Jie Scaled the single photo-electron peak to 100( adc channel #).
He chose to average the whole g2p data set instead of split them into multiple sets. See his result here
2) Melissa check Jie's fitted result with one beam energy data set. The result looks good. The
calibrated single photon-electron peak are very closed to 100. See here for details.
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
capacity of the Tungsten Colorimeter. JP suggested to survey the manufacture for this information.
2) Working on BPM calibration. Pengjia agreed to present the basic knowledge about the BPM calibration
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:
1)The posters and abstract of Ryan and Melissa is ready for review. Please send
them your comments. Toby's is also ready!
2)Hall A counting house will be renovated soon. Adaql# machine will not
be accessed from July 26,2012. Please back up your files!
Jixie has transfered ~adaq/g2p to /w/halla-1/g2p/g2p_at_adaqlX.tar.gz
Status Update:
- Pengjia:
1) Showed BCM calibration procedure. See this for detail.
- Jie & Melissa:
1) Fitted the single photon-electron peak with gauss-landau function and compared the result with
pure gauss fittings. Jie's result provides 2 sets of values: one is
most likely peak value and the other is maximum peak value. The maximum peak value is very closed to
the gaussian fitted result (within 2 channels, about 3%).
It is also very closed to Melissa's result.
Kalyan and Jixie suggested to use the maximum peak value in the calibration.
- Ryan:
1) continue working on run information for the mysql database. 1000 runs to go for left arm. Will
start right arm data after then.
2) follow up the ccpr about creating mysql server in the jlab farm.
3) learning optics optimization.
- 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:
- Chao:
1) Continue optics analysis. Trying to select 1000 good particles from each hole to do
the optimization
2) Finished checking optics run
3) Writing a program to insert HALLA:p and HALLA:dpp into the replay ntuple output.
- Pengjia:
1) BCM calibration is finished. A python code is ready to extract BCM calibration constants
for a given run number. Here is Pengjia's original words:
Hi Everyone,
I built a python class to get the bcm constant, you can find the code in:
/w/halla-1/g2p/codeshare/bcm/bcmconst.py
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.
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!
Pengjia
2) Continue working on BPM calibration
- Jie:
1) Applied a different TDC cut (which will remove the peak TDC) before fitting the single photon
electron position. This cut removes the plateaus in the photon-electron distribution.
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
which might improve the result. Jie agrees to try this and cross check with Melissa's result
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:
- Ryan:
1) Working on reading HaLogs and assigning run type for every run
2) Reported that the HWP status in the epics file tripped quite often (flip within seconds)
But there are plenty of solutions to achieve the status of HWP for a run.
- Min:
1) Working on improving the optimization. Will apply the following:
A) Select events from all of the holes if possible
B) Equally weight each hole
C) Add delta=+/- 3% data events into the optimization table
- Chao:
1) Creating a table which will describe the detail information for all optics runs
2) The name of two optics summary file are wrongly labeled. Jixie will fixed it.
- Jie:
1) Worked on Cherenkov calibration. In fitting the single phone electron peak, he found that
there are about 10 ADC channel difference between a Gaussian fit and Gaussian+pol3 fit.
Melissa and Jie will cross check there work.
- Melissa:
1) Optimizing the fit for signal photon electron peak
2) Working on extracting the efficiency for left and right PMTs in Left HRS
- Toby:
1) Wrote a script to determine the average target polarization for a given run
Karl suggested to look at the change of polarization within a run, trying to remove
bad|junk events
2) Crossing check Pengjia's Harp data calibration
- Pengjia:
1) Rewriting the program to calibrate BPM, still need to contact John for N15 BPM drawings
6/27/2012: Present: Jixie, Vince, Ryan, Melissa, Jie, JP, Chao, Toby, Kalyan, Pengjia By-Phone: Karl
Feature Presentation:
1) Melissa: Cherenkov Calibration)
A) Isolated single photon-electron peak with cuts.
JP suggested to fit with double peak function for some PMTs
B) Checked consistency
C) TODO: stability check and efficiency calculation
2) Min|Jixie: Left HRS straight through optics calibration
A) dp calibration shown
B) theta,phi angle calibration shown, still need to improve: will cut VZ out and
select equal number of events from each hole to avoid bias.
3) Chao: Report the helicity decoder status.
Status Update:
- Toby:
1) Continue the TE analysis
- 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
epics values and insert them into root file
2) BPM calibration:
A) Need survey data of the longitudinal setting. Already contact survey group
B) Asked John to provide engineering drawing for the N15 BPM
C) Will transfer Yves's trajectories into Hall A coordinate system
- 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:
1) Toby: Target_analysis_update)
TE analysis is done for one point, details is shown in the above link, 39 points to go
2) Chao: Updating db_run.dat, see details here.
A) Reported that 'end of run time' can be accessed with 3 methods, some methods do not work.
Vince suggested to also look into event type 100 in the raw data file.
B) Averaged epics variables in a run by run manner
C) HALLA:p is missing in the raw data. It sometimes even disappeared in the epics files. Pengjia will look
into this.
D) Removed helicity decoder from replay. Will do the helicity replay separately and store the result
into a table. This table will be inserted into the output ntuple each time the replay is running.
Status Update:
- Jie:
1) doing an independent check of the Cherenkov calibration. Working on A)the pedestal for each PMT
and B)Align single photo-electron peak for each PMT.
- Ryan:
1) Average the epics variable in a run. Can cross check with Chao's result
2) Sign a flag to each run based on all information(from student log, shift workers' log,etc...)
- Melissa:
1) Checking the consistency of the Cherenkov calibration.
- Min:
1) Checked materials and thickness that an incoming electron and an outgoing electron will go through,
reports posted in the elog entry 172
2) Put the survey information into the program and optimize straight through optics
- Pengjia:
1) Split the halog by author such that it will be convenient for searching. New halog is posted here.
2) Will check the epics for missing variable issue.
3) Working on BPM calibration.
- Jixie:
1) Organized the survey web. Talked with Jim for the right HRS survey which is done before the
experiment. The report for the HRS survey done after experiment is ready. Sieve and local dump survey
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:
1) Min: analysis database (run information table)
Beam energy, start time, P0, Theta0 for each run have been written into the table
107 runs are still missing. Chao will take care of these runs.
2) Jie: Finished VDC T0 calibration.
Status Update:
- Ryan:
1) Updated target_encoder, HWP status, prescale factors in the mysql database. See details here.
- Pengjia:
1) BPM: obtained noise for every gain setting
2) BCM: Gain is unstable before March 10. Need absolute uncertainty of calibration. Alex will look into it.
- Toby:
1) Picking out good TE measurements. Match TE points to the right material. Will do new fits.
2) Updated target log book on the wiki.
- Chao:
1) Improved helicity decoder
2) Will prepare run information table for further analysis
- Melissa:
1) Working on Cherenkov calibration
5/30/2012: Present: Jixie, Min, Pengjia, Melissa, Jie, Xiaochao, JP, Chao, Toby, Melissa By-Phone: Karl, Guy
General discussion (JP, Karl, ...):
1) Chiral Dynamics Workshop will be held at Jlab in Aug 6-10. The deadline for submission is June 1.
Please submit abstract.
2) Gorden conference will take place at the
same time. Submit abstract before deadline!
3) G2P group will give 3 talks for the Hall-A collaboration meeting .
We will meet next Wednesday 13:00-15:00 to practice the talks and giving feed-back.
Jixie has reserved L207. (Jun 6, 13:00 - 15:00).
4) Karl will provide plot|slice material to Bob and Jixie for their talks in Hall A collaboration meeting.
Feature presentation:
1) Pengjia: Preliminary BCM calibration Result
Status Update:
- Guy:
1) Have analysis meetings in Israel. Analyzing the data.
2) Need to discuss how to do the dilution factor calculation.
- 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.
2) will cross check BCM calibration soon.
- Toby:
1) Preparing the target material TE table for target calibration.
- Jie:
1) Working on VDC T0 calibration. Need more statistics to get the result.
- Melissa:
1) Working on CC calibration.
