Difference between revisions of "G2p Analysis Minutes"
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*Melissa: | *Melissa: | ||
1) Optimizing the fit for signal photon electron peak <br> | 1) Optimizing the fit for signal photon electron peak <br> | ||
| − | 2) Working on extracting the efficiency for | + | 2) Working on extracting the efficiency for left and right PMTs in Left HRS<br> |
*Toby: | *Toby: | ||
Revision as of 16:00, 3 July 2012
Minutes of the weekly analysis meetings
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 signing 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 Chrencov calibration. In fitting the single phone electron peak, he found that
there are about 10 adc channels difference between Gaussian fit and gass+pol3 fit
Melissa and Jie will cross check that
- 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 find out 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.
