Difference between revisions of "Nov 16, 2017 Calorimeter"

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# Check in the code, including scripts, that is used for recent calibrations into git (BCAL: Mark)
 
# Check in the code, including scripts, that is used for recent calibrations into git (BCAL: Mark)
−
# Andrei's time calibration cod [Zisis and Elton need to suggest process for checking]
+
# <strike> Andrei's time calibration cod [Zisis and Elton need to suggest process for checking] </strike> Zisis will ask Ahmed to take over the timing from Andrei and gain calibrations with comics will be taken over by Tegan.
−
# Add Fcal dead channels into the MC
+
# Add Fcal dead channels into the MC. [Matt and Elton]
−
# Report back on study of eta with in FCAL [Mark]
+
 
# Add monitoring plots for charged particle clusterizer [Will to suggest plots and collaborate with Mark]
 
# Add monitoring plots for charged particle clusterizer [Will to suggest plots and collaborate with Mark]
 +
# BCAL matching efficiency: We will need to work on two issues: a) why inclusion of correct material in BCAL affects the matching and b) why the matching efficiency decreased from about 85% when the charged clusterizer was included into the analysis.
 +
 +
Complete after new launch
 +
# Report back on study of eta with in FCAL [Mark]
 
# From Mike's work: -cos(phi) type dependence in the data and a phi dependence at the downstream end of the bcal
 
# From Mike's work: -cos(phi) type dependence in the data and a phi dependence at the downstream end of the bcal
  
Line 36: Line 39:
 
# Announcements
 
# Announcements
 
# Action Items
 
# Action Items
−
#* eta in Fcal: Mark noted that the technology is ready. Find large widths in FCAL related to the problematic HI calibrations. Mark to re-run once calibrations for new launch are finalized.
 
−
#* charged particle clusterizer: What plots make sense? (Will). Mark: has produced various plots that might be useful, but one needs to pare down the number to a few key plots.
 
 
# FCAL Update
 
# FCAL Update
−
## Run preparations
+
#* Run preparations
−
##* Detector is now back on
+
#* Other updates
−
##* 12 bases need replacing. Check with Chris/Nick for spares. Test if needed and provide them to Chris for replacement in the FCAL.
+
−
##* Low failure rate since turning bases back on. As of this morning, no new failed bases since checking 2 weeks ago.
+
−
## Calibrations
+
−
##* In preparation for next launch tomorrow
+
−
##* HV changes will be made based on the new gain constants. Wait a few weeks to check new gains and check analysis launch. Spend time to check code to prepare for HV changes.
+
−
##* Matt: Timing calibrations
+
−
##* Constants from low-intensity run used for the HI with adjustments made to smooth near-neighbor variations. Use these for the upcoming launch
+
−
##* See [https://logbooks.jlab.org/entry/3490937 Log Entry 3490937]
+
−
##* Time resolution is about 0.3 ns at 1 GeV for both data sets. HI slightly worse resolution than LI.
+
−
These times use the new method of determining the time from the energy-weighted average time. They also require a new time-walk correction function with one more parameters (ccdb needs to be modified)
+
−
##* Plan to check in new code this afternoon in time for the monitoring launch tomorrow.
+
−
##* Colin: gain calibrations:
+
−
##* Gain constants are converging. Added one more fiducial volume cut to one of the paired photons.
+
−
##* If next iteration is unchanged, the set of gain constants can be used to update ccdb.
+
−
## Sean comments
+
−
### After last iteration, need to update non-linearity correction, which should have a small effect. Systematic remain at high energy.  Matt: Note that at high energy, pi0 photons coalesce so cannot be used to determine the pi0 mass without bias.
+
−
### After calibration for high energy data, need to go back and recalibrate the low intensity data and 2016 with new geometry changes. 2017 Intermediate period between low and hi intensity also needs calibration. Matt points out that this is part of HI data set, so constants determined now will be used. However, small adjustments could be made based on HV changes at that time. Mark: Scale factor remains on energy scale. Colin: that is adjusted using the non-linearity correction.
+
−
### Mark: Should determine the gg mass at higher energy and obtain the eta mass as a consistency check of the energy scale.
+
 
# BCAL update
 
# BCAL update
−
## Run preparations
+
#* Run preparations
−
## Other updates
+
#* Other updates
 
# Calibrations
 
# Calibrations
 +
## [https://halldweb.jlab.org/DocDB/0034/003475/002/pi0update.pdf Exclusive pi0 calibration update]
 
# Reconstruction and Simulation
 
# Reconstruction and Simulation
 
# NIM articles
 
# NIM articles
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= Minutes =
 
= Minutes =
 +
 +
'' Attending: Elton, Mark, Colin (JLab); Zisis, Tegan, Ahmed (UofR); Christina, George (Athens); Will (CMU); Jon, Matt (IU)
 +
 +
# Announcements
 +
#* Accelerator is on schedule to deliver beam by Dec 4, perhaps earlier.
 +
# Action Items
 +
# FCAL Update
 +
## Run preparations (Colin)
 +
##* Need to replace 19 bases. 29 bases are fixed; 14 are tested and stable under HV. 15 need testing.
 +
##* Chris and Nick will replace bases next week
 +
##* Need to set new HV based on updated gains. Can use Adesh's method, or retake data of response vs voltage using LED data and use new curves
 +
##* Plan is to use Adesh's constants to start and retake data for comparison and use for new bases/bases.
 +
## Other updates
 +
##* Matt: Are pedestals taken automatically? Elton: Serguei usually does this at the beginning of the run.
 +
##* Note: Mark takes care of TDC threshold settings for BCAL. We should add these to the checklist so it won't be forgotten.# BCAL update
 +
## Run preparations
 +
##* Tegan and Ahmed checked that all SiPMs were operational about a month ago.
 +
##* Upstream chiller was running at a high pressure and was replaced with a spare. Need to check that it is behaving.
 +
##* Elton powered up all channels this morning. Chillers are still set to 18 deg C.
 +
## Other updates
 +
# Calibrations
 +
## Fcal: Colin asked about availability of pi0 files for 2016 at IU. May need to be staged before processing.
 +
##* Updated timing algorithm using the energy weighted average is in place and ready.
 +
##* Gain constants for 2017 low intensity have been sent to Sean. [2017 high intensity are already in ccdb]
 +
## [https://halldweb.jlab.org/DocDB/0034/003475/002/pi0update.pdf Exclusive pi0 calibration update]
 +
##* Will showed the gain calibrations after 38 iterations using the matrix inversion method. Pi0 width is comparable to that obtained by Will.
 +
##* Comparison of constants shows that the new constants (blue and green) are in a tighter distribution than Will's (red). Will asked if the red points are for the latest calibrations as they seem too broad. Tegan will check.
 +
##* Elton: It would be useful to show the y projection for each set of constants. Mark: Once the correct ccdb constants are obtained it would be interesting to show the difference compared to new ones (e.g. gain constant difference vs channel number, as well as projection).
 +
# Reconstruction and Simulation
 +
# NIM articles
 +
#* Elton: Draft has incorporated all of Eugene's comments. Ahmed sent in the last figure updates yesterday. The new documents needs new careful read after so many changes. Plan to have a "final draft" available before Thanksgiving.
 +
# Any other business

Latest revision as of 13:24, 16 November 2017

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.
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  5. More information on connecting to bluejeans is available.

Participant Direct Lines

  • JLab Phone in CC L207 is 757-269-7084 (usual room)
  • JLab Phone: in CC F326 is 757-269-6460
  • 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

  1. Check in the code, including scripts, that is used for recent calibrations into git (BCAL: Mark)
  2. Andrei's time calibration cod [Zisis and Elton need to suggest process for checking] Zisis will ask Ahmed to take over the timing from Andrei and gain calibrations with comics will be taken over by Tegan.
  3. Add Fcal dead channels into the MC. [Matt and Elton]
  4. Add monitoring plots for charged particle clusterizer [Will to suggest plots and collaborate with Mark]
  5. BCAL matching efficiency: We will need to work on two issues: a) why inclusion of correct material in BCAL affects the matching and b) why the matching efficiency decreased from about 85% when the charged clusterizer was included into the analysis.

Complete after new launch

  1. Report back on study of eta with in FCAL [Mark]
  2. From Mike's work: -cos(phi) type dependence in the data and a phi dependence at the downstream end of the bcal

References

  1. FCAL HDFCAL log book
  2. BCAL HDBCAL log book

Tentative Agenda

  1. Announcements
  2. Action Items
  3. FCAL Update
    • Run preparations
    • Other updates
  4. BCAL update
    • Run preparations
    • Other updates
  5. Calibrations
    1. Exclusive pi0 calibration update
  6. Reconstruction and Simulation
  7. NIM articles
  8. Any other business

Minutes

Attending: Elton, Mark, Colin (JLab); Zisis, Tegan, Ahmed (UofR); Christina, George (Athens); Will (CMU); Jon, Matt (IU)

  1. Announcements
    • Accelerator is on schedule to deliver beam by Dec 4, perhaps earlier.
  2. Action Items
  3. FCAL Update
    1. Run preparations (Colin)
      • Need to replace 19 bases. 29 bases are fixed; 14 are tested and stable under HV. 15 need testing.
      • Chris and Nick will replace bases next week
      • Need to set new HV based on updated gains. Can use Adesh's method, or retake data of response vs voltage using LED data and use new curves
      • Plan is to use Adesh's constants to start and retake data for comparison and use for new bases/bases.
    2. Other updates
      • Matt: Are pedestals taken automatically? Elton: Serguei usually does this at the beginning of the run.
      • Note: Mark takes care of TDC threshold settings for BCAL. We should add these to the checklist so it won't be forgotten.# BCAL update
    3. Run preparations
      • Tegan and Ahmed checked that all SiPMs were operational about a month ago.
      • Upstream chiller was running at a high pressure and was replaced with a spare. Need to check that it is behaving.
      • Elton powered up all channels this morning. Chillers are still set to 18 deg C.
    4. Other updates
  4. Calibrations
    1. Fcal: Colin asked about availability of pi0 files for 2016 at IU. May need to be staged before processing.
      • Updated timing algorithm using the energy weighted average is in place and ready.
      • Gain constants for 2017 low intensity have been sent to Sean. [2017 high intensity are already in ccdb]
    2. Exclusive pi0 calibration update
      • Will showed the gain calibrations after 38 iterations using the matrix inversion method. Pi0 width is comparable to that obtained by Will.
      • Comparison of constants shows that the new constants (blue and green) are in a tighter distribution than Will's (red). Will asked if the red points are for the latest calibrations as they seem too broad. Tegan will check.
      • Elton: It would be useful to show the y projection for each set of constants. Mark: Once the correct ccdb constants are obtained it would be interesting to show the difference compared to new ones (e.g. gain constant difference vs channel number, as well as projection).
  5. Reconstruction and Simulation
  6. NIM articles
    • Elton: Draft has incorporated all of Eugene's comments. Ahmed sent in the last figure updates yesterday. The new documents needs new careful read after so many changes. Plan to have a "final draft" available before Thanksgiving.
  7. Any other business
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