Difference between revisions of "Nov 19, 2015 Calorimetry"
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# Modify covariance matrix for FCAL and BCAL to correspond to the current resolution of the detectors (Matt). | # Modify covariance matrix for FCAL and BCAL to correspond to the current resolution of the detectors (Matt). | ||
# Change F250 simulation code to match firmware and add flexibility for new algorithms (Mike) | # Change F250 simulation code to match firmware and add flexibility for new algorithms (Mike) | ||
− | |||
= References = | = References = | ||
Line 35: | Line 34: | ||
# Announcements | # Announcements | ||
# Action Items | # Action Items | ||
− | # | + | # Run Preparations |
## FCAL Update | ## FCAL Update | ||
## BCAL Update | ## BCAL Update | ||
# Reconstruction and Simulation | # Reconstruction and Simulation | ||
#* FCAL Hadron reconstruction [https://logbooks.jlab.org/entry/3360676 Log Entry 3360676] (Elton) | #* FCAL Hadron reconstruction [https://logbooks.jlab.org/entry/3360676 Log Entry 3360676] (Elton) | ||
+ | #* FCAL MC nonlinear corrections [https://logbooks.jlab.org/entry/3361053 Log Entry 3361053] (Elton) | ||
# Calibration | # Calibration | ||
## [[Calibration Train | Calibration Challenge]] | ## [[Calibration Train | Calibration Challenge]] | ||
Line 46: | Line 46: | ||
= Minutes = | = Minutes = | ||
− | ''Attendees: | + | ''Attendees: Elton, Mark, Adesh, David (JLab); Sean (NW); Zisis, Ahmed, Noemi, Tegan, Andrei (UofR); Will, Mike (CMU); Matt, Jon (IU) |
+ | |||
+ | # Announcements | ||
+ | # Action Items | ||
+ | # Run Preparations | ||
+ | ## FCAL Update (Adesh) | ||
+ | ##* Matt and Adesh replaced 52 bases last week that showed HV=0 and reported no signals in pulser data | ||
+ | ##* Monitoring with EPICs since then shows about 6 pjs with HV=0 and checked no response with pulser data | ||
+ | ##* [https://logbooks.jlab.org/entry/3360930 Log Entry 3360930] (Jon) Four bases returned to IU found to have corrupt firmware. Reprogrammed and seem ok. Adesh was confused since these bases had a history of HV=0. They were also reprogrammed at JLab before return. Jon: After reprogrammed at IU they can be set and readback 1500 V correctly. They will be monitored for a week and checked before return to JLab. | ||
+ | ## Gain calibration | ||
+ | ##* Checked pedestals in runs with mode 7 and mode 8. All within +/- 1 count, which will be entered into ccdb | ||
+ | ##* [https://logbooks.jlab.org/entry/3360955 Log Entry 3360955] Pi0 calibration | ||
+ | ##* Different calibration constants for mode 7 and mode 8. They differ by about 20%. | ||
+ | ##* Mode 7: sigma~8.6 MeV, mean=134.8 MeV | ||
+ | ##* Mode 8: sigma~11 MeV, mean =135.1 MeV. | ||
+ | ##* Discrepancy in calibrations between mode 7 and mode 8 may be hinted by the different int/peak value mode7=6.5 (Run 2931) and mode 8=7.8 (Run 3079). This difference might be due to different Nsa+Nsb values for firmware and emulation. Adesh will check into this. | ||
+ | ##* Next step is to check in the calibration constants into the ccdb for the two data modes | ||
+ | ##* The HV on the tubes will be adjusted next week to decrease the variation in pmt gains. | ||
+ | ##* Paul's new GUI for scalers will be used to check for hot channels. | ||
+ | ## BCAL Update | ||
+ | # Reconstruction and Simulation | ||
+ | ## Updates from Regina (Zisis) | ||
+ | ##* Noemi continues to investigate the form of time-walk function comparing various options, which require adding columns to the ccdb entry. She will present comparison at the next meeting. | ||
+ | ##* Tegan and Andrei are revisiting the sampling fraction data generated almost 2 years ago by Andrei and Irina. They are considering the best way to incorporate into hdgeant | ||
+ | ## FCAL Hadron reconstruction [https://logbooks.jlab.org/entry/3360676 Log Entry 3360676] (Elton) | ||
+ | ##* Investigating the response of FCAL to hadrons. The energy deposition in the data exhibit a prominent minimum ionizing peak, a shoulder at higher energies thought to be due to Cherenkov light generated in the light guide, and a broad spectrum beginning at zero due to interacting pions. A rough efficiency for detecting a minimum energy in the FCAL per incident pion is shown | ||
+ | ## FCAL MC nonlinear corrections [https://logbooks.jlab.org/entry/3361053 Log Entry 3361053] (Elton) | ||
+ | ##* The MC and data reconstruction use very different set of non-linear corrections. For the data, the constants effectively eliminate the correction. For the MC, the corrections vary from 0.5 to 2 for energies below 6 GeV. | ||
+ | ##* We need to rethink how to incorporate both a scale factor into the MC as well as any non-linear corrections. We need to treat the data and MC on an equal footing. | ||
+ | ## Timing studies (Mike) | ||
+ | ##* Updated timing calibration tables for BCAL have been completed, but still need to be added to ccdb. | ||
+ | # Calibration | ||
+ | ## [[Calibration Train | Calibration Challenge]] | ||
+ | ##* Updates are trickling in. Will likely postpone tomorrow's meeting till early next week. | ||
+ | ##* Would like to include Mike's work. Will has also promised to provide a plugin for the BCAL gain calibration | ||
+ | ##* Sean: Asked about omega->pi0 g events for calibration. Jon has been working on the signal MC for this. Matt: The angular resolution of the missing photon is about 1 degree, which might limit how well this reaction can be used for efficiency studies. | ||
+ | ##* Sean: Are gain uncertainties available? Adesh/Will: No. Matt: Uncertainties should probably be included at the shower level. Elton:The uncertainties are driven by the calorimeter resolutions. We should probably get a parameterization of the resolution (which may also be a function of position) that can be used for input for the software to propagate through to higher level quantities. | ||
+ | # Any other business |
Latest revision as of 14:54, 19 November 2015
Contents
Video Conferencing Information
Meeting Time: 11:00 a.m.
- To join via a Web Browser, go to the page [1] https://bluejeans.com/907185247.
- To join via Polycom room system go to the IP Address: 199.48.152.152 (bjn.vc) and enter the meeting ID: 907185247.
- 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
- 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.
- 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
- Update BCAL clusterizer to improve agreement between simulated and generated MC (Mark)
- Modify covariance matrix for FCAL and BCAL to correspond to the current resolution of the detectors (Matt).
- Change F250 simulation code to match firmware and add flexibility for new algorithms (Mike)
References
Tentative Agenda
- Announcements
- Action Items
- Run Preparations
- FCAL Update
- BCAL Update
- Reconstruction and Simulation
- FCAL Hadron reconstruction Log Entry 3360676 (Elton)
- FCAL MC nonlinear corrections Log Entry 3361053 (Elton)
- Calibration
- Any other business
Minutes
Attendees: Elton, Mark, Adesh, David (JLab); Sean (NW); Zisis, Ahmed, Noemi, Tegan, Andrei (UofR); Will, Mike (CMU); Matt, Jon (IU)
- Announcements
- Action Items
- Run Preparations
- FCAL Update (Adesh)
- Matt and Adesh replaced 52 bases last week that showed HV=0 and reported no signals in pulser data
- Monitoring with EPICs since then shows about 6 pjs with HV=0 and checked no response with pulser data
- Log Entry 3360930 (Jon) Four bases returned to IU found to have corrupt firmware. Reprogrammed and seem ok. Adesh was confused since these bases had a history of HV=0. They were also reprogrammed at JLab before return. Jon: After reprogrammed at IU they can be set and readback 1500 V correctly. They will be monitored for a week and checked before return to JLab.
- Gain calibration
- Checked pedestals in runs with mode 7 and mode 8. All within +/- 1 count, which will be entered into ccdb
- Log Entry 3360955 Pi0 calibration
- Different calibration constants for mode 7 and mode 8. They differ by about 20%.
- Mode 7: sigma~8.6 MeV, mean=134.8 MeV
- Mode 8: sigma~11 MeV, mean =135.1 MeV.
- Discrepancy in calibrations between mode 7 and mode 8 may be hinted by the different int/peak value mode7=6.5 (Run 2931) and mode 8=7.8 (Run 3079). This difference might be due to different Nsa+Nsb values for firmware and emulation. Adesh will check into this.
- Next step is to check in the calibration constants into the ccdb for the two data modes
- The HV on the tubes will be adjusted next week to decrease the variation in pmt gains.
- Paul's new GUI for scalers will be used to check for hot channels.
- BCAL Update
- FCAL Update (Adesh)
- Reconstruction and Simulation
- Updates from Regina (Zisis)
- Noemi continues to investigate the form of time-walk function comparing various options, which require adding columns to the ccdb entry. She will present comparison at the next meeting.
- Tegan and Andrei are revisiting the sampling fraction data generated almost 2 years ago by Andrei and Irina. They are considering the best way to incorporate into hdgeant
- FCAL Hadron reconstruction Log Entry 3360676 (Elton)
- Investigating the response of FCAL to hadrons. The energy deposition in the data exhibit a prominent minimum ionizing peak, a shoulder at higher energies thought to be due to Cherenkov light generated in the light guide, and a broad spectrum beginning at zero due to interacting pions. A rough efficiency for detecting a minimum energy in the FCAL per incident pion is shown
- FCAL MC nonlinear corrections Log Entry 3361053 (Elton)
- The MC and data reconstruction use very different set of non-linear corrections. For the data, the constants effectively eliminate the correction. For the MC, the corrections vary from 0.5 to 2 for energies below 6 GeV.
- We need to rethink how to incorporate both a scale factor into the MC as well as any non-linear corrections. We need to treat the data and MC on an equal footing.
- Timing studies (Mike)
- Updated timing calibration tables for BCAL have been completed, but still need to be added to ccdb.
- Updates from Regina (Zisis)
- Calibration
- Calibration Challenge
- Updates are trickling in. Will likely postpone tomorrow's meeting till early next week.
- Would like to include Mike's work. Will has also promised to provide a plugin for the BCAL gain calibration
- Sean: Asked about omega->pi0 g events for calibration. Jon has been working on the signal MC for this. Matt: The angular resolution of the missing photon is about 1 degree, which might limit how well this reaction can be used for efficiency studies.
- Sean: Are gain uncertainties available? Adesh/Will: No. Matt: Uncertainties should probably be included at the shower level. Elton:The uncertainties are driven by the calorimeter resolutions. We should probably get a parameterization of the resolution (which may also be a function of position) that can be used for input for the software to propagate through to higher level quantities.
- Calibration Challenge
- Any other business