Difference between revisions of "June 2, 2016 Calorimeter"

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# Announcements
 
# Announcements
−
# [[GlueX-Collaboration-May-2016|Collaboration Meeting]]
 
 
# Action Items
 
# Action Items
−
# Run Preparations
+
# Preparation for REST production
−
## FCAL Update
+
# Calibrations
−
### [https://logbooks.jlab.org/files/2016/05/3403493/FCAL%20Efficiency%20Studies%20May5.16_0.pdf FCAL Efficiency Studies] (Jon)
+
−
## BCAL Update
+
−
### [http://argus.phys.uregina.ca/gluex/DocDB/0029/002998/003/CAL_meeting_may5.pdf BCAL clustering update] (Will M.)
+
 
# Reconstruction and Simulation
 
# Reconstruction and Simulation
−
# Calibration
 
 
# Any other business
 
# Any other business
  
 
= Minutes =
 
= Minutes =
  
−
''Attendees: Christine, George (Athens), Mark D., Adesh, Jon (Jlab), Matt (IU), Curtis, Mike, Will M (CMU), Sean (NU), Tegan, Andrei, Ahmed, Colleen, Zisis (Regina)''
+
''Attendees:Elton, Jon, Adesh (JLab); Curtis, Will (CMU); Christina, George (Athens); Sean (NW); Matt (IU); Zisis, Ahmed, Tegan, Colleen, Andrei (UofR)
  
 
# Announcements
 
# Announcements
−
# Collaboration Meeting: 4 Calorimetry talks are set.
+
# Action Items
−
# Action Items: none.
+
# Preparation for REST production
−
# Run Preparations
+
## FCAL (Ahmed)
−
## FCAL Update
+
##* Pedestals, gain constants, non-linear corrections to be checked in today
−
### Matt reported on the hardware failures.  Understanding is starting to converge.  He showed the base electronics schematics and explained the effects deviation from the 180 and 165 V circuits: when the former drops it causes  inefficiency in the switching of the base by drawing too much current and causing trips, while the when the latter drops the HV circuit shits down. These effects can occur there is dirt or solder under the 0.1-inch-long 10 MOhm resistors.  About 100 bases (3%) have been affected. Not one base that has been treated (cleaned) has failed, although the long term behaviour is not known.  The bases will be repaired as the need arises. The procedure will be documented and the cleaning/refurbishing will be done at JLab. 
+
##* Non-linear corrections use a piece-wise linear and exponential forms. Will show this next time.
−
### Jon reported on his gp->omega p with the omega going to (g)pi0, and the gamma potentially missing. Delta-theta represents the difference between missing and thrown gamma. Large Delta-theta is at small E. Work is ongoing.
+
##* CCDB does not presently have sufficient entries for all constants, some are hard coded for now. Later updates will place everything into the db.
−
## BCAL Update
+
##* Also need to check in code to match the new correction function.
−
### George presented his update on the timing and effective velocity.  He had circulated his slides to the BCAL group earlier but will post them on the Wiki or DocDB. All 768 plots are qualitatively similar to what is shown in this presentation.  Parameter p2 needs to be understood better, and the azimuthal behaviour is not understood.
+
##* Expect to have everything in place by this evening. Possible tweaking of constants may happen tonight. Adesh will keep Sean informed of progress.
−
### Will M. talked about the big improvement in the BCAL clusterizer.  Single g in MC data was used.  Red shows the confines of the old clusterizer, magenta shows the improved version.  Spherical coordinates have been used in the new model. The performance is superior now in terms of reducing the number of splitoffs.  Some overlaps (merges) still remain.
+
##* Pluggin to plot pi0 peaks with various cuts has been checked in.
−
### Ahmed is working on the far/near ratio from the pulser and productions runs. He is also continuing to look at the layer efficiency following Mike's new emulation.  Results will be reported soon.
+
##* (Sean) Launch will run off a fixed time stamp in the ccdb.
−
### Andrei is working on the t-w and too corrections. Nothing to report yet.
+
# Calibrations
 +
## BCAL (Will)
 +
##* Gain constants are checked in for this launch
 +
##* Non-linear corrections are being studied by looking at changes of the pi0 mass vs various quantities, but are not included at this time. Changes of pi0 mass are less than 2 MeV over range of parameters studied.
 +
## BCAL Timing
 +
##* George: No new update since updating code to match new calibrations for zpoint. After discussions with Zisis and Christina, he decided to move to work on physics analysis and avoid overlaps with Andrei's work.
 +
##* Andrei: Time walk and time offset calibrations have been completed for charged particles.
 +
##* There is no time to get them ready for the launch later today
 +
##* Calibration with charged tracks shows clear tof bands for protons and pions. Checking systematics as a function of layer number and other parameters.
 +
##* Starting analysis with neutral showers.
 +
## BCAL LED Monitoring (Ahmed)
 +
##* https://logbooks.jlab.org/entry/3406797
 +
##* Good progress in determining different Led configurations, but some anomalies still remain, e.g. in column 1 in logbook plots
 +
##* Sean has written the skim program to peel off the LED triggers. In addition to stripping out events with the front panel (FP) trigger bit 9 or 10 set, events are selected for a)Total energy in BCAL > 12 GeV or b) Number of hits in BCAL > 200.
 
# Reconstruction and Simulation
 
# Reconstruction and Simulation
−
## Tegan reported on a new version of further optimized cuts on his eta-prime analysis to the decay pi+pi-eta using ver3 REST data.  All looks good, similar to Simon's result.
+
##* Colleen and Tegan are looking at Michel electrons from muon decay.
−
# Calibration: Sean is producing the new set calibration jobs which should be done by the end of the month. Matt said that the precise timing circuit of the flash behaves well and pulses look good for the FCAL. We need to digest what we have to date and examine the Eres which his not behaving like the expected 1/sqrt(E).
+
##* Colleen wrote a toy MC to look at energy depositions.
−
# Any other business: Curtis emphasized that effort must be poured into mcsmear over the next few months.
+
##* This toy MC is now being used as an event generator to seed hdgeant with the energy and verteces of electrons.
 +
##* Comparisons between the toy MC and hdgeant are underway.
 +
## Fcal efficiency (Jon)
 +
##* Has been investigating the use of omega->pi0 gamma to determine Fcal efficiencies.
 +
##* The fully exclusive channel including all photons works reasonably well.
 +
##* Excluding the bachelor photon from the reconstruction leads to a S/B ~ 1/50, which will not allow for the efficiency to be determined with much accuracy.
 +
##* Started looking at omega -> pi+pi-pi0 and this channel is more promising.
 +
# Any other business
 +
## Next launch (Adesh)
 +
##* Second launch is about 2 weeks away. The data set comes from the last weekend of the run period.
 +
##* Need to start getting calibrations ready for the new launch
 +
##* Adesh discovered that DAQ values were changed affecting pedestals for about 10-15 runs. Special calibrations of pedestals, gains and possibly non-linear corrections will be needed for these runs. (Changes were not noted in the log book).
 +
##* We need to have better control over DAQ adjustments during the run period.

Latest revision as of 12:58, 2 June 2016

Video Conferencing Information

Meeting Time: 11:00 a.m.

  1. To join via a Web Browser, go to the page [1] https://bluejeans.com/907185247.
  2. To join via Polycom room system go to the IP Address: 199.48.152.152 (bjn.vc) and enter the meeting ID: 907185247.
  3. To join via phone, use one of the following numbers and the Conference ID: 907185247.
    • US or Canada: +1 408 740 7256 or
    • US or Canada: +1 888 240 2560
  4. Upon connection all microphones are automatically muted. To unmute your mike on a Polycom or equivalent unit, enter *4. Unmuting on a computer is trivial as there is a microphone button than can be clicked.
  5. More information on connecting to bluejeans is available.

Participant Direct Lines

  • JLab Phone: in CC F326 is 757-269-6460 (usual room)
  • JLab Phone in CC L207 is 757-269-7084
  • Phone in the Regina Video-conference Suite is 306-585-4204
  • Athens Phone: in Christina's office is 011-30-210-727-6947

Action Items

References

  1. FCAL HDFCAL log book
  2. BCAL HDBCAL log book
  3. BCAL Action Items and Working Tasks

Tentative Agenda

  1. Announcements
  2. Action Items
  3. Preparation for REST production
  4. Calibrations
  5. Reconstruction and Simulation
  6. Any other business

Minutes

Attendees:Elton, Jon, Adesh (JLab); Curtis, Will (CMU); Christina, George (Athens); Sean (NW); Matt (IU); Zisis, Ahmed, Tegan, Colleen, Andrei (UofR)

  1. Announcements
  2. Action Items
  3. Preparation for REST production
    1. FCAL (Ahmed)
      • Pedestals, gain constants, non-linear corrections to be checked in today
      • Non-linear corrections use a piece-wise linear and exponential forms. Will show this next time.
      • CCDB does not presently have sufficient entries for all constants, some are hard coded for now. Later updates will place everything into the db.
      • Also need to check in code to match the new correction function.
      • Expect to have everything in place by this evening. Possible tweaking of constants may happen tonight. Adesh will keep Sean informed of progress.
      • Pluggin to plot pi0 peaks with various cuts has been checked in.
      • (Sean) Launch will run off a fixed time stamp in the ccdb.
  4. Calibrations
    1. BCAL (Will)
      • Gain constants are checked in for this launch
      • Non-linear corrections are being studied by looking at changes of the pi0 mass vs various quantities, but are not included at this time. Changes of pi0 mass are less than 2 MeV over range of parameters studied.
    2. BCAL Timing
      • George: No new update since updating code to match new calibrations for zpoint. After discussions with Zisis and Christina, he decided to move to work on physics analysis and avoid overlaps with Andrei's work.
      • Andrei: Time walk and time offset calibrations have been completed for charged particles.
      • There is no time to get them ready for the launch later today
      • Calibration with charged tracks shows clear tof bands for protons and pions. Checking systematics as a function of layer number and other parameters.
      • Starting analysis with neutral showers.
    3. BCAL LED Monitoring (Ahmed)
      • https://logbooks.jlab.org/entry/3406797
      • Good progress in determining different Led configurations, but some anomalies still remain, e.g. in column 1 in logbook plots
      • Sean has written the skim program to peel off the LED triggers. In addition to stripping out events with the front panel (FP) trigger bit 9 or 10 set, events are selected for a)Total energy in BCAL > 12 GeV or b) Number of hits in BCAL > 200.
  5. Reconstruction and Simulation
      • Colleen and Tegan are looking at Michel electrons from muon decay.
      • Colleen wrote a toy MC to look at energy depositions.
      • This toy MC is now being used as an event generator to seed hdgeant with the energy and verteces of electrons.
      • Comparisons between the toy MC and hdgeant are underway.
    2. Fcal efficiency (Jon)
      • Has been investigating the use of omega->pi0 gamma to determine Fcal efficiencies.
      • The fully exclusive channel including all photons works reasonably well.
      • Excluding the bachelor photon from the reconstruction leads to a S/B ~ 1/50, which will not allow for the efficiency to be determined with much accuracy.
      • Started looking at omega -> pi+pi-pi0 and this channel is more promising.
  6. Any other business
    1. Next launch (Adesh)
      • Second launch is about 2 weeks away. The data set comes from the last weekend of the run period.
      • Need to start getting calibrations ready for the new launch
      • Adesh discovered that DAQ values were changed affecting pedestals for about 10-15 runs. Special calibrations of pedestals, gains and possibly non-linear corrections will be needed for these runs. (Changes were not noted in the log book).
      • We need to have better control over DAQ adjustments during the run period.
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