|
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| Line 47: |
Line 47: |
| | *Jie | | *Jie |
| | **Showed an updated version of multi-track efficiency analysis. He determined that his new method of <br>including background cuts is not as reliable as his previous method to determine uncertainty. By including <br>background cuts, the systematic uncertainty is decreased by about 20%, but it very position dependent, so <br>he suggests staying with his previous results. His presentation can be found [http://hallaweb.jlab.org/experiment/g2p/collaborators/jie/2013_06_04_multi_track_eff/Multitrack_20130604.pdf here]. | | **Showed an updated version of multi-track efficiency analysis. He determined that his new method of <br>including background cuts is not as reliable as his previous method to determine uncertainty. By including <br>background cuts, the systematic uncertainty is decreased by about 20%, but it very position dependent, so <br>he suggests staying with his previous results. His presentation can be found [http://hallaweb.jlab.org/experiment/g2p/collaborators/jie/2013_06_04_multi_track_eff/Multitrack_20130604.pdf here]. |
| − |
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| − |
| |
| | | | |
| − |
| |
| − |
| |
| − | ----
| |
| − |
| |
| − | ==5/22/2013==
| |
| − |
| |
| − | Present: Kalyan, Jixie, Karl, Min, Jie, Melissa <br>
| |
| − | By-Phone: Pengjia, Ellie, Toby, Ryan, Moshe <br>
| |
| − |
| |
| − | '''General discussion:''' <br>
| |
| − | *Min will give the g2p update at the next Hall A collaboration meeting (June 13-14)
| |
| − |
| |
| − |
| |
| − | '''Feature presentations:'''
| |
| − | *Jie
| |
| − | **Working on systematic uncertainty study for multi-track efficiencies. He found that ~1.4% of <br>one track events (that pass PID cuts) are not aligned in the pion rejectors, suggesting a <br> misconstruction in the VDC. However, when acceptance cuts are applied, this number of events <br>that are mis-aligned drops to ~0.1%. <br>
| |
| − | **Also showed a background study to determine the systematic uncertainty for the correction <br>factor for events with 2 or 3 tracks. For the worst case, the correction to the total number <br>of events is 17.73% (+0.14%) (-0.27%). Full details can be found [http://hallaweb.jlab.org/experiment/g2p/collaborators/jie/2013_05_22_multi_track_eff/vdc_multitrack_20130516.pdf here]
| |
| − |
| |
| − | *Melissa
| |
| − | **Showed results for beam charge asymmetry for upstream BCM after fixing problems from previous <br>results. Will compare with Pengjia's results once it is complete. Full details are [http://hallaweb.jlab.org/experiment/g2p/collaborators/melissac/BeamCharge/BeamCharge_05_22.pdf here]
| |
| − |
| |
| − | *Pengjia
| |
| − | **Working on BPM calibrations and encountered a few problems. For higher currents, the noise <br>pedestal is very large compared with to the signal, and sometimes there are reflections from <br>the pedestal. This means there is a large dependence on current for calculated beam positions. <br>His first step will be to try and eliminate the effects of changing current. Full details can <br>be found [http://hallaweb.jlab.org/experiment/g2p/collaborators/pzhu/05222013/bpm_status_20130522.pdf here]
| |
| − |
| |
| − | *Min
| |
| − | **Last week showed results from LHe events, this week showed the results from carbon events. <br>Previously she found issues with the first order matrix calibration using beam positions that <br>were not calibrated. First she will update the results using calibrated beam positions. If this <br>does not solve the problem she will choose a different run with more stable beam conditions. <br>Her presentation can be found [http://hallaweb.jlab.org/experiment/g2p/collaborators/mhuang/05222013/052213_snake.pdf here]
| |
| − | ----
| |
| − |
| |
| − | ==5/17/2013==
| |
| − |
| |
| − | Present: JP, Kalyan, Jixie, Karl, Min, Alex <br>
| |
| − | By-Phone: Pengjia, Toby, Ryan, Elena <br>
| |
| − |
| |
| − | '''General discussion:''' <br>
| |
| − |
| |
| − | *NEW meeting time: We will meet at Wednesday 10:30 from next week.
| |
| − | *Poster competition abstracts due on today, May 17th. Please submit an abstract ASAP!
| |
| − |
| |
| − | '''Feature presentations:'''
| |
| − | *Ryan
| |
| − | **Working on Ytg calibration. Ryan present the Ytg calibration result for LHRS using <br>
| |
| − | a run without target field and also that for RHRS but with 5T longitudinal target field. <br>
| |
| − | It looks like that the beam position is not stable at all during the course we took optics data.<br>
| |
| − | If one apply a cut on the beam position the optimized Ytg will achieve 0.5 mm resolution. <br>
| |
| − | Otherwise it will be about 1.1 mm. Details can be seen [https://userweb.jlab.org/~rbziel/Weekly_Meetings/Optics_51613.pdf here].
| |
| − |
| |
| − |
| |
| − |
| |
| − | ----
| |
| − | ==5/10/2013==
| |
| − |
| |
| − | Present: JP, Vince, Kalyan, Jixie, Jie, Min, Melissa <br>
| |
| − | By-Phone: Pengjia, Toby, Ryan, Ellie, Karl, Alex <br>
| |
| − |
| |
| − | '''General discussion:''' <br>
| |
| − | *If you haven't yet filled out the Doodle poll for a new meeting day/time, please do so ASAP!
| |
| − |
| |
| − | '''Feature presentations:'''
| |
| − | *Melissa
| |
| − | **Working on a cross-check of beam charge asymmetries. Showed stability of up/down BCMs. For some energy <br>settings there is a drift in one of the BCMs.
| |
| − | **Also showed results for charge asymmetries, but there may be a problem with helicity decoding (shifted by one bit). <br> She will talk to Pengjia/Chao about this and fix results for next time. Full details can be seen [http://hallaweb.jlab.org/experiment/g2p/collaborators/melissac/BeamCharge/BeamCharge_05_10.pdf here].
| |
| − |
| |
| − | *Pengjia
| |
| − | **Showed an update on beam charge asymmetries. He used Chao's helicity decoder and his own as a double <br>check, and saw similar results using both decoders. Full details can be seen [http://hallaweb.jlab.org/experiment/g2p/collaborators/pzhu/05102013/charge_asym_05102013.pdf here]
| |
| − | **Still working on BPM calibrations (just finished copying over data)
| |
| − |
| |
| − | *Min
| |
| − | **Showed an update on SNAKE matching data, this time using a run where the beam was better centered. <br>Since the new run was taken with the foil in LHe, the energy loss from the LHe will have to be accounted for.
| |
| − | **The current result for the difference in y between data and SNAKE is ~3.3mm, with delta-y = ~3.2mm. <br>Full details can be seen [http://hallaweb.jlab.org/experiment/g2p/collaborators/mhuang/05102013/051013_snake.pdf here]
| |
| − |
| |
| − |
| |
| − | ----
| |
| − |
| |
| − | ==5/03/2013==
| |
| − |
| |
| − | Present: JP, Vince, Min, Jixie, Kalyan, Jie, Melissa <br>
| |
| − | By-Phone: Pengjia, Toby, Ryan <br>
| |
| − |
| |
| − | '''General discussion:''' <br>
| |
| − |
| |
| − |
| |
| − | '''Feature presentations:'''
| |
| − | *Toby
| |
| − | **Showed an update of study to determine systematic uncertainty for TE measurements. He used 1st-4th order <br> polynomials and compared the quality of the fits. 2nd, 3rd and 4th order polynomials seem to give good results, <br> but the 1st order polynomial is much worse. To determine the uncertainty, he chose the two fists with the most <br> agreement and looked at the variance between the two fits. This resulted in a relative uncertainty that <br>varied from 2-30%.
| |
| − | **JP/Vince suggested trying a different function to fit the baseline subtracted signal, since the fluxation in <br> uncertainty suggests that the polynomial fit is not stable. Full details can be found [http://hallaweb.jlab.org/experiment/g2p/collaborators/toby/g2p%20meetings/05.03.13.pdf here]
| |
| − |
| |
| − | *Ryan
| |
| − | **Looking at how y-target values are calculated with the optimization code. It looks like the code uses 3 <br> different values for real y-target while it runs, which results in a "shoulder" in the reconstructed y-target <br> variable. He will look at BPM information to see if multiple peaks are visible.
| |
| − |
| |
| − | *Pengjia
| |
| − | **Showed results from using helcity information to determine the fast clock rate. Because the fast clock is <br> not stable, there is a shift in time in the phase fit for the slow raster ADC data. Pengjia is working on how <br>to account for this.
| |
| − | **Also working on beam charge asymmetries. He first determined them using Chao's decoder, but will check using <br>his own decoder. His presentation can be found [http://hallaweb.jlab.org/experiment/g2p/collaborators/pzhu/05032013/fastclockvsasym.pdf here]
| |
| − |
| |
| − | *Jie
| |
| − | **Showed his procedure for determining uncertainties for muti-track efficiencies. For 2 and 3 track <br> events, two methods were used to determine the systematic uncertainty. Method 1 considered tracks that <br> were within one block of each other. Method 2 loosened the cut on the distance between blocks (two block <br> widths), but additionaly required that at least one track satisfy a set of acceptance cuts. JP suggested <br> that method 2 is the better method, but method 1 could provide an upper limit on the systematic uncertainty.
| |
| − | **Also working on data quality checks for optics variables (t0 and tracking variables). Looks good <br> so far with a few problem runs. Full details can be found [http://hallaweb.jlab.org/experiment/g2p/collaborators/jie/2013_05_02_multi_track_eff/LHRS_multitrack_20130502.pdf here]
| |
| − |
| |
| − |
| |
| − | ----
| |
| − | ==4/26/2013==
| |
| − |
| |
| − | Present: JP, Vince, Kalyan, Jixie, Alex, Jie, Min, Melissa <br>
| |
| − | By-Phone: Elena, Toby, Ryan, Karl, Pengjia <br>
| |
| − |
| |
| − | '''General discussion:''' <br>
| |
| − | In regards to status of data quality checks: <br>
| |
| − | *List of variables can be found [http://hallaweb.jlab.org/experiment/g2p/collaborators/kalyan/data_quality_checks.txt here]
| |
| − | **PID detectors (Cherenkov, lead glass): pretty much complete
| |
| − | **VDC: Jie is making good progress
| |
| − | **Optics: Some variables will have to wait until optics is more complete. For now, Jie will start looking at <br> focal plane variables, which don't require optics.
| |
| − | **Helicity: Pengjia/Chao will start working on this
| |
| − | **EPICS variables: Ryan will take a look at this.
| |
| − | **Scintillators: Trigger efficiencies and deadtime are done. Ryan will look at helicity gated deadtime.
| |
| − |
| |
| − | '''Feature presentations:'''
| |
| − | *Melissa
| |
| − | **Showed results from data quality checks for RHRS PID detectors. Found a total of 46 runs with "issues". <br> Full details can be found [http://hallaweb.jlab.org/experiment/g2p/collaborators/melissac/DataQual/DataQual_04_26.pdf here].
| |
| − | **Will compile results from LHRS and RHRS into a document.
| |
| − |
| |
| − |
| |
| − | *Min
| |
| − | **Showed updates on SNAKE tuning. Described her plan for improving results shown previously; first she will <br> look at a run with better centered beam (but carbon in LHe). Then she will try to tune the Q1 field. If this <br> doesn't work she will adjust other fields/currents in the SNAKE model to match. JP suggested talking to <br> John Lerose to understand how well different parameters of the system are known, and adjust the model appropriately. <br> The effect of the septum field on Q1 is still the biggest unknown. Her presentation can be found [http://hallaweb.jlab.org/experiment/g2p/collaborators/mhuang/04262013/0426013_snake.pdf here]
| |
| − |
| |
| − |
| |
| − | ----
| |
| − | ==4/19/2013==
| |
| − |
| |
| − | Present: Vince, Chao, Jie, Melissa, Jixie, Min, Kalyan <br>
| |
| − | By-Phone: Elena, Toby, Ryan, Karl, Alex, Pengjia <br>
| |
| − |
| |
| − | '''General discussion'''
| |
| − |
| |
| − | '''Feature presentations:'''
| |
| − | *Toby
| |
| − | **Showed an update on target uncertainty analysis. The uncertainty in the TE measurements seems to <br> be very small (~10<sup>-5</sup>), however, there might be an error in the calculations.
| |
| − | **Also showed the results of using different order polynomials to fit the baseline subtracted <br> NMR signals. He used 1<sup>st</sup>-4<sup>th</sup> order polynomials and found a large variance of uncertainty (70%) <br> between fits. Next time he will show more details of the procedure to understand this large variance. <br> Full details can be found [http://hallaweb.jlab.org/experiment/g2p/collaborators/toby/g2p%20meetings/04.18.13.pdf here]
| |
| − |
| |
| − | *Jie
| |
| − | **Working on determining the uncertainty for the multi-track efficiency. For zero track events,<br> the systematic uncertainty was determined by counting events that survive the PID cuts, but have <br> no track in the VDC. For 2/3 track events, two methods were used to determine the systematic <br> uncertainty. Method 1 considered tracks that were within 14.5 cm (the width of one block) of each <br> other, so it was not possible to distinguish between them. Method 2 loosened the cut on the <br> distance between blocks (29cm, two block widths), but additionaly required that at least one <br> track satisfy a set of acceptance cuts. Method 1 gives a larger systematic uncertainty. Full <br> details can be found [http://hallaweb.jlab.org/experiment/g2p/collaborators/jie/2013_04_19_multi_track_efficiency/Multitrack_20130419.pdf here]. Next time Jie will show results for the "worst case" kinematic setting.
| |
| − |
| |
| − | *Pengjia
| |
| − | **Showed the status of the raster calibration. Previously, he used information from both BPM A and B <br> to determine the raster size at the target. This led to a huge uncertainty (1mm), so instead <br> he will use only information from BPM A.
| |
| − | **Also showed new results for fitting the slow raster phase - fit looks much better! However, it seems <br> that the fast clock rate appears to be unstable on a run to run basis. He will check this using other <br> copies of the fast clock. For the fast raster phase reconstruction he will first use the ADC value directly.
| |
| − | ** Next he will work on a BPM noise study and improving the BPM resolution. His presentation can be found [http://hallaweb.jlab.org/experiment/g2p/collaborators/pzhu/04192013/raster_status_20130419.pdf here]
| |
| − |
| |
| − | *Ryan
| |
| − | **Working on y-target optimization. Found that optimization didn't rely on BPM information. It's possible <br> that the two peak issue is a result of an issue with the BPM reconstruction, specifically that the reconstruction <br> doesn't take into account the foil location. Ryan will discuss with Pengjia to figure out the problem. <br> Full details can be found [https://userweb.jlab.org/~rbziel/Weekly_Meetings/g2p_2013419.pdf here]
| |
| − |
| |
| − |
| |
| − | ----
| |
| − | ==4/5/2013==
| |
| − |
| |
| − | Present: Karl, Vince, Jixie, Kalyan, Chao, Jie, Min, Melissa <br>
| |
| − | By-Phone: Elena, Toby, Ryan, Alex <br>
| |
| − |
| |
| − | '''General discussion'''
| |
| − | *Practice talks for Chao/Min will be Thursday, April 11th <br> An e-mail will be sent out with the time/location
| |
| − |
| |
| − | *There will be no meeting next week, as many people will be gone for GHP/APS meetings.
| |
| − |
| |
| − |
| |
| − | '''Feature presentations:'''
| |
| − | *Chao
| |
| − | **Working on updating the simulation package. Showed a comparison of the 2 carbon elastic <br> models. There seems to be good agreement for the region where data is available. Also <br> showed tests of the similuation for scattering angle and delta-p. Full details can be <br> found [http://hallaweb.jlab.org/experiment/g2p/collaborators/chao/20130405/Chao_WeeklyMeeting_04052013.pdf here]
| |
| − |
| |
| − | *Min
| |
| − | **Working on tuning the SNAKE model. Showed an updated table of uncertainty from first order <br> matrix, this time with y0 and phi0 as lineraly correlated variables. Working on tuning the Q1 field, <br> possibly by studying the sieve hole projection closer to the focal plane center. Full details <br> can be found [http://hallaweb.jlab.org/experiment/g2p/collaborators/mhuang/03212013/03212013_snake.pdf here]
| |
| − |
| |
| − | *Melissa
| |
| − | **Showed the results of data quality checks for the LHRS. Found a total of 48 runs with "issues". <br> Also had to update PID cuts for runs taken with a short ammonia cell. Full details can be found [http://hallaweb.jlab.org/experiment/g2p/collaborators/melissac/DataQual/DataQual_03_21.pdf here]
| |
| − |
| |
| − |
| |
| − | ----
| |
| − | ==3/29/2013==
| |
| − |
| |
| − | Present: Vince, Jixie, Kalyan, Chao, Jie, Melissa <br>
| |
| − | By-Phone: Pengjia, Min, Karl, Elena, Toby, Ryan, Alex <br>
| |
| − |
| |
| − | '''General discussion'''
| |
| − |
| |
| − | We will have practice talks starting next week for students going to GHP/APS meetings: <br>
| |
| − | Toby/Melissa: Thursday, April 4th <br>
| |
| − | Chao/Min: Thursday, April 11th
| |
| − |
| |
| − | An e-mail will be sent out with the time/location.
| |
| − |
| |
| − | '''Feature presentations:'''
| |
| − | *Pengjia
| |
| − | **Showed the status of the raster calibration. He is going to use the position transport function to calulate <br> the size of the raster at the target. The problem with this method is it will increase the uncertainty because <br> of the BPM.
| |
| − | **Also working on slow raster shape resonstruction to minimize uncertainty caused by the accuracy limit of the ADC. <br> He will try using a successful fit (entries 2000-2100) and extrapolating to another region (entries 7000-7100). <br> Also, he needs to determine the actual rate of the fast clock from scaler data. Full details can be found [http://hallaweb.jlab.org/experiment/g2p/collaborators/pzhu/03292013/raster_status_20130329.pdf here ]
| |
| − |
| |
| − | *Jie
| |
| − | **Working on multi-track efficiencies. He extended his previous analysis to include 7-track events. Next he will <br> determine how this contributes to the overall systematic error. His presentation can be found [http://hallaweb.jlab.org/experiment/g2p/collaborators/jie/2013_03_28_multi_track_efficiency/LHRS_multitrack_20130328.pdf here ]
| |
| − |
| |
| − | *Toby
| |
| − | **Working on the target polarization uncertanties. The leading uncertainty comes from the fit to the wings of <br> the baseline subtracted signal. He will check the fit with different functions to determine an uncertainty of the fit. <br>. His presentation can be found [http://hallaweb.jlab.org/experiment/g2p/collaborators/toby/g2p%20meetings/03.29.13/g2pmeeting_3_28.pdf here ]
| |
| − |
| |
| − | *Ryan
| |
| − | **Gave an update on RHRS longitudinal optics for the "very bad" septa configuration. He showed the results for the y-target <br> calibration after applying a tight cut on BPM x-values. The results seem to agree with values predicted by the formula from <br> Min's technote. Full details can be seen [https://userweb.jlab.org/~rbziel/Weekly_Meetings/Optics_32013.pdf here ]
| |
| − |
| |
| − | ----
| |
| − | ==3/21/2013==
| |
| − |
| |
| − | Present: JP, Jixie, Kalyan, Jie, Melissa, Chao, Min <br>
| |
| − | By-Phone: Karl, Elena, Ryan, Toby, Alex <br>
| |
| − |
| |
| − | '''General discussion'''
| |
| − |
| |
| − | '''Feature presentations:'''
| |
| − | *Melissa
| |
| − | **Showed the procedure for data quality checks using PID detectors. See details [http://hallaweb.jlab.org/experiment/g2p/collaborators/melissac/DataQual/DataQual_03_21.pdf here ] <br>
| |
| − |
| |
| − | *Chao
| |
| − | **Working on updating the simulation package. Tested the cross section weighted distribution <br>
| |
| − | with P. Bosted model. Currently working on the elastic carbon-12 model. Full details can be found [http://hallaweb.jlab.org/experiment/g2p/collaborators/chao/20130321/Chao_WeeklyMeeting_03212013.pdf here]
| |
| − |
| |
| − | *Min
| |
| − | **Working on tuning SNAKE model. Trying to find the center sieve hole coordinates at various end plates. <br>
| |
| − | Currently able to account for only half of the effect (either phi or y). <br>
| |
| − | Will work on adjusting the septum current and HRS offset to optimize SNAKE model with data. Full presentation can be found [http://hallaweb.jlab.org/experiment/g2p/collaborators/mhuang/03212013/03212013_snake.pdf here]
| |
| − |
| |
| − | *Kalyan
| |
| − | **Showed a [http://hallaweb.jlab.org/experiment/g2p/collaborators/kalyan/data_quality_checks.txt list] of variables being used for data quality checks.
| |
| − |
| |
| − | ----
| |
| − |
| |
| − | ==3/15/2013==
| |
| − |
| |
| − | Present: Jixie, Jie, Min, Melissa, Chao, JP, Karl, Kalyan, Vince <br>
| |
| − | By-Phone: Ryan, Toby, Elena Long, Pengjia <br>
| |
| − |
| |
| − | '''General discussion'''
| |
| − | Next meeting will take place in Thursday 14:30. Vince will reserve a room and <br>
| |
| − | send notification through email.
| |
| − |
| |
| − | '''Feature presentation:'''
| |
| − |
| |
| − | *Jie:
| |
| − | ** Updated the multiple track analysis. <br>
| |
| − | **The discrepancy between L-HRS and R-HRS in multiple track events was solved after updating the database <br>
| |
| − | which define the geometry. <br>
| |
| − | Studied the faction of at least one good track in all events for all runs. After carefully reconstruction, <br>
| |
| − | the multiple track events, we can find at least one good electron in 98% of total triggers, with about<br>
| |
| − | 1% systematic error. Jie will provide the detail number later. See details [http://hallaweb.jlab.org/experiment/g2p/collaborators/jie/2013_03_14_multi_track_efficiency/LHRS_multitrack_20130315.pdf here]<br>
| |
| − | **Will do the same analysis to the right HRS. <br>
| |
| − |
| |
| − | *Toby:
| |
| − | **Working on target polarization uncertainty
| |
| − | **Preparing the presentation for GHP.
| |
| − |
| |
| − | *Ryan:
| |
| − | **Rerun replay for 5T longitudinal field Optics runs with the CORRECT BPM calibration constants. <br>
| |
| − | Used a wrong BPM settings in previous replay and can not get reasonable beam position. Got reasonable BPM information<br>
| |
| − | at this trial but beam position covers a wide range of 2 mm, which means the beam was drifting way slowly. <br>
| |
| − | **Did a [https://userweb.jlab.org/~rbziel/Weekly_Meetings/Optics_31512.pdf Y_tg optimization]. The result is about 2 to 3 mm away from what it should be. JP suggested to make cuts<br>
| |
| − | on beam position at the target (mainly horizontal) then try again. <br>
| |
| − |
| |
| − | *Pengjia:
| |
| − | **BPM calibration status: most run is ready, but the part between April 26 to 30 is not ready yet. <br>
| |
| − | **Working on raster calibration. See Pengjia's talk [http://hallaweb.jlab.org/experiment/g2p/collaborators/pzhu/03152013/bpm_status_03152013.pdf here]. <br>
| |
| − |
| |
| − | ----
| |
| − |
| |
| − | ==3/8/2013==
| |
| − |
| |
| − | Present: Jixie, Jie, Min, Melissa, Chao, JP, Kalyan <br>
| |
| − | By-Phone: Ryan, Toby, Elena Long, Karl, Pengjia <br>
| |
| − |
| |
| − | '''General discussion'''
| |
| − |
| |
| − | '''Feature presentation:'''
| |
| − |
| |
| − | *Melissa:
| |
| − | ** Moller write up (By Sasha) is ready in the wiki. (G2p wiki-> Analysis ->Moller)
| |
| − | ** Beam polarization run by run result is ready. The bleed through from hall C in terms of beam ratio<br>
| |
| − | was less than 1%. The beam polarization for the bleed though was as small as several percents. We can ignore <br>
| |
| − | this part in the analysis. (Melissa is very kind to provide a run by run table.) <br>
| |
| − | ** [http://hallaweb.jlab.org/experiment/g2p/collaborators/melissac/Technotes/Efficiency_technote_draft.pdf Tech note] for colorimeter and Cherenkov efficiency is ready to review. <br>
| |
| − |
| |
| − | *Chao:
| |
| − | ** Working on the simulation packages. Optimized the drift in field module by dynamically changing the<br>
| |
| − | step length. <br>
| |
| − | ** Present the idea that how we determine the vertical interaction position which is needed to do reconstruction.<br>
| |
| − | ** Check how large the distribution center will move after weight by cross section. See details [http://hallaweb.jlab.org/experiment/g2p/collaborators/chao/20130308/Chao_WeeklyMeeting_03082013.pdf here]. <br>
| |
| − |
| |
| − | *Min:
| |
| − | ** Kept tuning snake model to match real spectrometer. Made the following changes. <br>
| |
| − | A) Solved a few bugs of position offsets. <br>
| |
| − | B) Extended septum box to cover more field region, aiming to reduce the BdL lost <br>
| |
| − | C) Adding HRS offsets using survey results <br>
| |
| − | D) Using the real Q1 currents <br>
| |
| − | ** With this update, the center hole hits on focal plane have about 8.7 mm shift in y position if match the phi angle<br>
| |
| − | or have 8.5 mrad shift in phi angle if match the y position. See details [http://hallaweb.jlab.org/experiment/g2p/collaborators/mhuang/03082013/03082013_snake.pdf here].
| |
| − |
| |
| − | *Pengjia:
| |
| − | ** Present a [http://hallaweb.jlab.org/experiment/g2p/collaborators/pzhu/03082013/pos_optics.pdf slice] for the beam position for the optics data that were taken on March 14, 2012. It turned out that <br>
| |
| − | the beam position was not centered. It had 4.4 mm shift to the left and 1.5 shift to the up. <br>
| |
| − | ** The slice also indicated that BPM B is not stable. Pengjia agreed to find a way to avoid unnecessary fluctuation.<br>
| |
| − |
| |
| − | *Jixie:
| |
| − | ** Present the [http://hallaweb.jlab.org/experiment/g2p/collaborators/jixie/20130228_DetermineCentralValue/DetemineCentralValue.pdf study] of how well can we determine the central value for a distribution. <br>
| |
| − | ** There is no good event by event resolution for the scattering angle when the target field is on. We will reconstruct <br>
| |
| − | FP hits only to the target plane. By comparing the central value for the scattering angle and also the cross section distribution <br>
| |
| − | between cross section weighted or unweighted situation, we can tell how well we can determine the central value. <br>
| |
| − | Jixie did this comparison in several HRS momentum settings. The work show that we can determine the central value better than<br>
| |
| − | 1% using snake model. To reach this precision in real data, we have to calibration the reconstruction to avoid any offsets and bias. <br>
| |
| − | See details [http://hallaweb.jlab.org/experiment/g2p/collaborators/jixie/20130228_DetermineCentralValue/DetemineCentralValue.pdf here]. <br>
| |
| − |
| |
| − | ----
| |
| − |
| |
| − | ==3/1/2013==
| |
| − |
| |
| − | Present: Jixie, Jie, Min, Melissa, Chao, Karl, Vince, Kalyan <br>
| |
| − | By-Phone: Ryan, Toby, Elena Long, Alex <br>
| |
| − |
| |
| − | '''General discussion'''
| |
| − |
| |
| − | '''Feature presentation:'''
| |
| − | *Toby:
| |
| − | **Analyzed the target polarization [http://hallaweb.jlab.org/experiment/g2p/collaborators/toby/g2p%20meetings/03.01.13/targetunc.pdf uncertainty]. <br>
| |
| − |
| |
| − | *PengJia:
| |
| − | **Merged HAPPEX decoder to g2plib. The beam packages will use HAPPEX decoder by default. Before it is <br>
| |
| − | fastbus. HAPPEX has much better resolution than fastbus if fastbus is using auto gain. Pengjia compared<br>
| |
| − | the resolution of these 2 daqs at various situations. See details [http://hallaweb.jlab.org/experiment/g2p/collaborators/pzhu/03012013/bpm_status_20130301.pdf here]. <br>
| |
| − | **Found an optics run (22259) that happex and fastbus did not agree with each other. PengJia agree to <br>
| |
| − | to check all optics runs to see if this problem occur or not. <br>
| |
| − |
| |
| − | *Ryan:
| |
| − | **Tried to use PengJia's BPM package. Need some more work to get it right. <br>
| |
| − | **Practiced Ytg optimization. <br>
| |
| − |
| |
| − | *Jie:
| |
| − | **Updated the multiple tracks efficiency analysis. <br>
| |
| − | **The goal is to find the ratio of at-least-one-good-track event in two-track events under normal cuts. <br>
| |
| − | **There is a large deviation between L-HRS and R-HRS in previous talk. Jie found that it was because the <br>
| |
| − | database of the prl1 and prl2 geometry was wrong. After manually correct the data, L-HRS and R-HRS agree <br>
| |
| − | well to each other. See his nice work [http://hallaweb.jlab.org/experiment/g2p/collaborators/jie/2013_02_28_multi_track_lhrs/LHRS_multitrack.pdf here].<br>
| |
| − |
| |
| − |
| |
| − | ----
| |
| − |
| |
| − | ==2/22/2013==
| |
| − |
| |
| − | Present: Jixie, Jie, Min, Kalyan, Melissa, Chao, JP, Alex <br>
| |
| − | By-Phone: Ryan, Toby, Elena Long, Karl <br>
| |
| − |
| |
| − | '''General discussion'''
| |
| − |
| |
| − | '''Feature presentation:'''
| |
| − | *Melissa:
| |
| − | **Got the asymmetry result run by run from QWEAK Compton polarimetry. Match it <br>
| |
| − | to the g2p run by run according to the time stamp. Will use this asymmetry table to <br>
| |
| − | to check if there is any fluctuation in the beam polarization. See details
| |
| − | [http://hallaweb.jlab.org/experiment/g2p/collaborators/melissac/BeamPol/BeamPol_02_22.pdf here]. <br>
| |
| − |
| |
| − | *Chao:
| |
| − | **Working on building the single arm simulation program, testSNAKE. Add field and field integration modules.<br>
| |
| − | **Test the method of "Match reconstructed trajectory to Beam trajectory to get the interaction point". <br>
| |
| − | The results shows that this method does not have a good event by event reconstruction at all. <br>
| |
| − | See [http://hallaweb.jlab.org/experiment/g2p/collaborators/chao/20130222/Chao_WeeklyMeeting_02222013.pdf the slices] for details.<br>
| |
| − |
| |
| − | *Jixie:
| |
| − | **Test the trajectory matching method independently. Jixie generated events at 3 2-mm-Z-slices: 10cm upstream,<br>
| |
| − | target center and 10 cm downstream. The results show that the matching method can not find the interaction point<br>
| |
| − | at all. See details [http://hallaweb.jlab.org/experiment/g2p/collaborators/jixie/20130220_MatchTraj/MatchTrajectories.pptx here]. <br>
| |
| − |
| |
| − | *Min:
| |
| − | **Continue working on creating a snake model that can represent g2p setting. Phifp and Yfp can not match at the same time.<br>
| |
| − | Need more efforts. See this [http://hallaweb.jlab.org/experiment/g2p/collaborators/mhuang/02222013/02222013_snake.pdf link] for details. <br>
| |
| − |
| |
| − | *kalyan:
| |
| − | ** Updated the analysis status flow [http://hallaweb.jlab.org/experiment/g2p/collaborators/kalyan/g2p_analysis_flow_feb2013.pdf chart].<br>
| |
| − | Most of the task is done. BPM and slow raster is in progress. Straight through optics is 80% done. <br>
| |
| − | It depends on BPM calibration. <br>
| |
| − |
| |
| − | ----
| |
| − |
| |
| − | ==2/15/2013==
| |
| − |
| |
| − | Present: Jixie, Jie, Min, Kalyan, Melissa, Chao, JP <br>
| |
| − | By-Phone: Ryan, Toby, Pengjia, Elena Long, Karl , Alex<br>
| |
| − |
| |
| − | '''General discussion'''
| |
| − | The Fall DNP (October 23-26, 2013) for this year will be held at Newport News.
| |
| − | Can we have result by then?
| |
| − | Answer: Not likely.
| |
| − |
| |
| − | '''Feature presentation:'''
| |
| − | *Toby:
| |
| − | **average N sweep area to get the mean value <br>
| |
| − | **Systematic errors came from Magnetic field drift, temperature fluctuation, NMR drift and so on <br>
| |
| − | will be added to each sweep later. <br>
| |
| − | **Systematic error is about 2-3%. Will details later. <br>
| |
| − | **will go back through the TE measurements and using a more rigorous chi2-minimization technique to exclude poor data <br>
| |
| − | See details [http://hallaweb.jlab.org/experiment/g2p/collaborators/toby/g2p%20meetings/02.15.13/polUncertaintyAna.pdf here].<br>
| |
| − |
| |
| − | *Ryan:
| |
| − | **Provided a root library to connect to the mysql database. <br>
| |
| − |
| |
| − | *Jie:
| |
| − | **Updated on the two-track analysis for both arms. There is about 20% deviation between left and right arm<br>
| |
| − | on the ratio of one good track out of two-track events. This issue is still over there. Jie will keep working <br>
| |
| − | on it. See details [http://hallaweb.jlab.org/experiment/g2p/collaborators/jie/2013_02_14_multi_track_rhrs/multitrack_2013214.pdf here].<br>
| |
| − |
| |
| − | *Pengjia:
| |
| − | **Generated transport function from BPM to target center for field is on situations. <br>
| |
| − | **Found a better way to determine harp noise. <br>
| |
| − | **Updated BPM packages. Used the uncertainty of each single harp measurement as the weight in the TMinuit fitting.<br>
| |
| − | The BPM uncertainty (preliminary) is about 1.5 mm for position and 1.4 mrad for<br>
| |
| − | angles when target field is off. There will be some room to improve. <br>
| |
| − |
| |
| − | ----
| |
| − |
| |
| − | ==2/08/2013==
| |
| − |
| |
| − | Present: Jixie, Alex, Vince, Jie, Min, Kalyan, Melissa, Chao, JP <br>
| |
| − | By-Phone: Ryan, Toby, Pengjia, Elena Long <br>
| |
| − |
| |
| − | '''General discussion'''
| |
| − |
| |
| − | '''Feature presentation:'''
| |
| − |
| |
| − | *Melissa:
| |
| − | ** Finalized the cut and efficiency analysis. The pi/e ratio after the optimized cut are <br>
| |
| − | now 0.4% for both arms. See details [http://hallaweb.jlab.org/experiment/g2p/collaborators/melissac/Efficiency/Eff_02_08.pdf here]. <br>
| |
| − | ** Melissa agreed to write some note about this job. <br>
| |
| − |
| |
| − | *Toby:
| |
| − | **The previous R-HRS cooking used a wrong calibration file for the preshower. Need to do a recook.<br>
| |
| − |
| |
| − | *Min:
| |
| − | ** Working on tuning the snake to match the real data. Min tried to turn the quadrapole and<br>
| |
| − | dipole such that the simulated variables in FP match the real data. But this is wrong. She will<br>
| |
| − | go back to the original dipole setting and try to tune septum fields. <br>
| |
| − |
| |
| − | *Chao:
| |
| − | **Gave [http://hallaweb.jlab.org/experiment/g2p/collaborators/chao/20130208/Chao_WeeklyMeeting_02082013.pdf an update about the simulation]. <br>
| |
| − | A ZERO and FIRST order post processing correction have been made to the none raster snake model. The Zero order correction <br>
| |
| − | can remove most of the offsets between real data and snake model. The FIRST order correction can make it event better. <br>
| |
| − | This is just a machinery check to make sure the program work fine. Will present this kind of job once Min finish tuning SNAKE.<br>
| |
| − | From the ZERO order correction we can see that Q1 in the snake model need some tuning.<br>
| |
| − |
| |
| − | ----
| |
| − | ==2/01/2013==
| |
| − |
| |
| − | Present: Jixie, Vince, Jie, Min, Kalyan, Melissa, Chao, JP <br>
| |
| − | By-Phone: Ryan, Toby, Pengjia, Karl <br>
| |
| − |
| |
| − | '''General discussion'''
| |
| − |
| |
| − | '''Feature presentation:'''
| |
| − |
| |
| − | *Ryan:
| |
| − | **Present the result of quality check: <br>
| |
| − | LHRS: 956 good runs (73%), 104 junks(8%), the others have some <br>
| |
| − | issues which might be useful with extra treating.<br>
| |
| − | R-HRS: 798 runs are good (68%) and 109 are junks(9%) <br>
| |
| − | See details [http://nuclear.unh.edu/~ryan/MYSQL.pdf here]. <br>
| |
| − |
| |
| − | *Pengjia:
| |
| − | **Improved the code which is judge whether the beam is drifting.<br>
| |
| − | **Updated MUDIFI program to export c code with error transfer function, refit the BPM transport functions.<br>
| |
| − | See Pengjia's talk [http://hallaweb.jlab.org/experiment/g2p/collaborators/pzhu/02012013/bpm_status_02012013.pdf here]. <br>
| |
| − |
| |
| − | *Jie:
| |
| − | **Working on the multi-track analysis. Check the status [http://hallaweb.jlab.org/experiment/g2p/collaborators/jie/2013_01_31_multi_track_lhrs/LHRS_multitrack.pdf here]. <br>
| |
| − |
| |
| − |
| |
| − | ----
| |
| − |
| |
| − | ==1/25/2013==
| |
| − |
| |
| − | Present: Jixie, Vince, Jie, Min, Kalyan, Melissa, Chao, JP, Katherine <br>
| |
| − | By-Phone: Ryan, Toby, Pengjia, Karl <br>
| |
| − |
| |
| − | '''General discussion'''
| |
| − |
| |
| − | '''Feature presentation:'''
| |
| − |
| |
| − | *Chao:
| |
| − | ** Add Rotating Coordinate System (RCS) to Focal Plane variable in the code. In the real DB, the reconstruction <br>
| |
| − | takes the variables in the RCS, not the Transport Coordinate System(TCS). With this modification, the reconstruction<br>
| |
| − | between simulation and real DB agree with each other better. But still have noticeable difference.
| |
| − | ** The forward transport of the snake model still have some offset to the real detected FP variables. Need to correct <br>
| |
| − | the offsets.
| |
| − | ** Checked the first order matrix elements for both real DB and SNAKE backward model. The real DB matrix first <br>
| |
| − | order elements for <theta_tg|y_fp> and <theta_tg|phi_fp> seem too large. See details [http://hallaweb.jlab.org/experiment/g2p/collaborators/chao/20130125/Chao_WeeklyMeeting_01252013.pdf here]. <br>
| |
| − |
| |
| − | *Min:
| |
| − | ** Presented a writeup for the [http://hallaweb.jlab.org/experiment/g2p/collaborators/mhuang/01252013/uncertainty_pointing.pdf uncertainty of the pointing measurement]. According to this document, to reach<br>
| |
| − | 0.5% relative uncertainty of the scattering angle, the uncertainty of the energy difference between 2 peaks <br>
| |
| − | in the pointing measurement should be 45 keV. <br>
| |
| − | ** Present the initial pointing result [http://hallaweb.jlab.org/experiment/g2p/collaborators/mhuang/01252013/01252013.pdf].<br>
| |
| − |
| |
| − | *Melissa:
| |
| − | ** Worked on optimizing the PID cuts for good electrons. She has done that for a few momentum settings. Need to <br>
| |
| − | go through all the momentum settings. See details [http://hallaweb.jlab.org/experiment/g2p/collaborators/melissac/Efficiency/Eff_01_25.pdf here].<br>
| |
| − |
| |
| − | ----
| |
| − | ==1/18/2013==
| |
| − | Present: Jixie, Vince, Jie, Min, Kalyan, Melissa, Chao, JP <br>
| |
| − | By-Phone: Ryan, Toby, Pengjia, Karl <br>
| |
| − |
| |
| − | '''General discussion'''
| |
| − |
| |
| − | From next week, we will have the weekly analysis meeting at 10 AM every Friday.
| |
| − |
| |
| − | '''Feature presentation:'''
| |
| − |
| |
| − | * Ryan:
| |
| − | # Presented the [http://userweb.jlab.org/~rbziel/Weekly_Meetings/Optics_1712.pdf optics calibration] for 5T longitudinal field data set, R-HRS. <br>
| |
| − |
| |
| − | *Pengjia:
| |
| − | # Presented the status of BPM calibration for straight through data set. <br>
| |
| − | Pengjia was trying to find the time interval that the beam is not stable and treat<br>
| |
| − | them separately. He is using the 1000 events and 7500 events moving RMS to determine<br>
| |
| − | one whole run into several period. See details [http://hallaweb.jlab.org/experiment/g2p/collaborators/pzhu/01152013/beammove.pdf here]. <br>
| |
| − |
| |
| − | * Jie:
| |
| − | #Took an initial look at multiple tracks at the colorimeter. Jie was suggested to add<br>
| |
| − | the electron cut then repeat the analysis. See details [http://hallaweb.jlab.org/experiment/g2p/collaborators/jie/2013_01_14_multi_track_lhrs/LHRS_multitrack.pdf here].<br>
| |
| − |
| |
| − | ----
| |
| − |
| |
| − | ==1/8/2013==
| |
| − | Present: Jixie, Vince, Jie, Min, Melissa, Kalyan, Chao, JP, Karl <br>
| |
| − | By-Phone: Ryan, Toby, Pengjia <br>
| |
| − |
| |
| − | '''General discussion'''
| |
| − |
| |
| − | * APS abstract deadline is this Friday. The deadlines for GHP and INPC are also very <br>
| |
| − | close. Those who want to attend these conference please prepare the abstract as early as possible. <br>
| |
| − |
| |
| − | '''Feature presentation:'''
| |
| − |
| |
| − | * Min:
| |
| − | #Presented 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>
| |
| − | #Prepared the non-raster SNAKE backward model for Chao.
| |
| − |
| |
| − | *Chao:
| |
| − | #Working to compare the 1st order matrix element between REAL DB and SNAKE backward matrix. <br>
| |
| − | #Chao has a long term plan to make a simplified version of HRS simulation using existing modules. <br>
| |
| − |
| |
| − | *Melissa:
| |
| − | #Updated 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>
| |
| − | Will do the R-HRS next. <br>
| |
| − |
| |
| − | * Toby:
| |
| − | #Working on replay script. The output ntuple is too big. Students need to discuss and determine what variables should <br>
| |
| − | be kept. Jixie suggested to include the unfinished BPM reconstruction in the cooking train at this moment. To save time and <br>
| |
| − | space, do not cook optics runs. <br>
| |
| | | | |
| | | | |
