Difference between revisions of "Dec 14, 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) | ||
− | # Add Fcal dead channels into the MC. [Matt and Elton] | + | # <strike> Add Fcal dead channels into the MC. [Matt and Elton] </strike> See links below |
# 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: Why the matching efficiency decreased by about 2% when the charged clusterizer was included into the analysis. | + | # <strike> BCAL matching efficiency: Why the matching efficiency decreased by about 2% when the charged clusterizer was included into the analysis. </strike> In progress by Simon |
Complete after new launch | Complete after new launch | ||
Line 40: | Line 40: | ||
# FCAL Update | # FCAL Update | ||
## Run preparations | ## Run preparations | ||
+ | ## [https://logbooks.jlab.org/entry/3504395 Nonlinear correction in MC] | ||
+ | ## [https://logbooks.jlab.org/entry/3504431 CCDB block efficiency update] | ||
## Other updates | ## Other updates | ||
+ | ##* Photon Efficiency Update [https://halldweb1.jlab.org/wiki/index.php/File:GlueX_Updates_Dec14_2017_calmtg.pdf (Jon)] | ||
# BCAL update | # BCAL update | ||
## Run preparations | ## Run preparations | ||
## Other updates | ## Other updates | ||
# Calibrations | # Calibrations | ||
− | |||
# Reconstruction and Simulation | # Reconstruction and Simulation | ||
− | |||
− | |||
# NIM articles | # NIM articles | ||
# Any other business | # Any other business | ||
= Minutes = | = Minutes = | ||
− | + | ''Attendees: Elton, Mark, Colin, Simon (JLab); Sean (FSU); Matt, Jon (IU); George (Athens); Zisis (UofR); Will (CMU). | |
− | + | ||
# Announcements | # Announcements | ||
# Action Items | # Action Items | ||
# FCAL Update | # FCAL Update | ||
− | ## Run preparations | + | ## Run preparations (Colin) |
+ | ##* Chris has 14 bases to be replaced tomorrow. 16 additional bases dropping 100 V below set point. Have 10 bases ready for the test bench today. Could be used on Monday. | ||
+ | ##* Matt: What is the current failure rate? Colin: too many issues being sorted out to get a good number right now. | ||
+ | ##* Elton: What voltages are to be used for the spring 2018? Colin: Would like to take LED data at various voltages to establish gain vs voltage curves. (Mark and Colin will take dat today). Need about 10k events per run. | ||
+ | ##* Procedure: Use the measured gains using pi0 peaks and voltages during spring 2017 to predict new voltage to set new gains. | ||
+ | ##* Discussion about edge blocks (3 inner layers and 3 outer layers). Gains not determined during calibration. Need to get the best estimate in order to make HV adjustments. | ||
+ | ##* Matt: Could also use LED data to adjust relative gains with nearest neighbors, but we expect LED signal input variations due to light collection. | ||
+ | ##* Matt: On the longer time scale, would like to use MC to estimate leakage so that pi0 peaks can be adjusted to expected (degraded) position and calibrate accordingly. | ||
+ | ## LED script (Mark) | ||
+ | ##* Modified Fcal LED pulser script to cycle at 10 min intervals at 10 Hz. Blue set to 29V; violet to 11.9 V and green to 9.9 V. | ||
+ | ##* Want to run at 2 voltages? Matt: Yes, but careful that outer pmts do not get too much light. | ||
+ | ##* Mark: How to choose voltages? -Match dynamic range to limit number of overflows for high light channels, but yet increase distance from pedestals for low light channels. | ||
+ | ## [https://logbooks.jlab.org/entry/3504395 Nonlinear correction in MC] (Matt) | ||
+ | ##* Using photon particle gun. Plotted Ereconstructed/Egenerated vs Ereconstructed. | ||
+ | ##* Use piece-wise continuous linear+exponential function to fit non-linearity. | ||
+ | ##* Sacrificing the lowest point (0.25 GeV), function reproduces data < 0.75 GeV. | ||
+ | ##* Mark: The non-linearities should be calibrated in MC in the same was as data (eventually). | ||
+ | ##* Elton: Need a better matching at low energies if we are going to reconstruct showers down to 0.25 GeV, where corrected means are off by 6%. | ||
+ | ##* Finding the physics channels that require using low-energy photons can be used to drive the reevaluation of this correction. | ||
+ | ##* Matt: Could Sean take the constants in the log entry and add them to ccdb? Yes. | ||
+ | ## [https://logbooks.jlab.org/entry/3504431 CCDB block efficiency update] (Elton) | ||
+ | ##* Added block efficiencies computed by Matt based on LED data to the ccdb. | ||
+ | ##* Peaks in efficiency can be found at zero efficiency (dead channels), and eff~0.6-0.7. This could be due to channels being on 2/3 of the time. Another possibility, mentioned by Matt is that 3 LED colors were used to compute efficiencies and then averaged. If 2 of the 3 LED signals were above threshold that would create the same result. | ||
+ | ##* Next step is to generate a large omega MC sample to check calibrations and overall scale in MC. | ||
+ | ##* Sean asked if Matt could check linearity to higher energies (e.g. 10 GeV) with adequate input data. Matt: Yes. Sean will ask Thomas to generate more events at higher energies. | ||
## Other updates | ## Other updates | ||
+ | ##* Photon Efficiency Update [https://halldweb1.jlab.org/wiki/index.php/File:GlueX_Updates_Dec14_2017_calmtg.pdf (Jon)] | ||
+ | ##* Update on efficiency computations using gp->omega p, omega->pi+pi-pi0, pi0->g(g). Require one reconstructed gamma, E>0.5 GeV. Eliminate events with additional more than 2 clusters. | ||
+ | ##* Perform kinematic fit to reaction with one gamma missing. Select on kinematic CL for both samples with two reconstructed photons (numerator) and one or two reconstructed photons (denominator) | ||
+ | ##* Estimate efficiency by determining the ratio of events in the omega peak using recoil proton missing mass divided by the number in the omega invariant mass peak. | ||
# BCAL update | # BCAL update | ||
## Run preparations | ## Run preparations | ||
+ | ##* Python libraries became corrupted in June and had to be fixed (David). LED pulser is now running again and Mark left instructions on the BCAL expert page. | ||
## Other updates | ## Other updates | ||
# Calibrations | # Calibrations | ||
− | # | + | #* Tegan task is to compare calibrations using exclusive vs inclusive samples (but is in the middle of exams) |
# Reconstruction and Simulation | # Reconstruction and Simulation | ||
− | ## | + | #* Zisis: Neutron reconstruction. Andrei continues to study this and will suggest best places to include neutron clusterizer code integrated into the neutral and charged particle clusterizers. |
− | # | + | #* Sean: Checking timing resolution for BCAL. Latest updates indicate that situation is ok, though not perfect. He has sent files to Mark for evaluation. |
+ | #* BCAL non-linear corrections: Will to evaluate the latest MC updates and check non-linearities in MC using single photon particle gun. | ||
# NIM articles | # NIM articles | ||
+ | #* Many comments received, which are being included into "final" draft. Elton and Zisis will talk next week to review final changes. | ||
# Any other business | # Any other business |
Latest revision as of 15:00, 14 December 2017
Contents
[hide]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.
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- 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
- Check in the code, including scripts, that is used for recent calibrations into git (BCAL: Mark)
-
Add Fcal dead channels into the MC. [Matt and Elton]See links below - Add monitoring plots for charged particle clusterizer [Will to suggest plots and collaborate with Mark]
-
BCAL matching efficiency: Why the matching efficiency decreased by about 2% when the charged clusterizer was included into the analysis.In progress by Simon
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
References
- FCAL HDFCAL log book
- BCAL HDBCAL log book
Tentative Agenda
- Announcements
- Action Items
- FCAL Update
- Run preparations
- Nonlinear correction in MC
- CCDB block efficiency update
- Other updates
- Photon Efficiency Update (Jon)
- BCAL update
- Run preparations
- Other updates
- Calibrations
- Reconstruction and Simulation
- NIM articles
- Any other business
Minutes
Attendees: Elton, Mark, Colin, Simon (JLab); Sean (FSU); Matt, Jon (IU); George (Athens); Zisis (UofR); Will (CMU).
- Announcements
- Action Items
- FCAL Update
- Run preparations (Colin)
- Chris has 14 bases to be replaced tomorrow. 16 additional bases dropping 100 V below set point. Have 10 bases ready for the test bench today. Could be used on Monday.
- Matt: What is the current failure rate? Colin: too many issues being sorted out to get a good number right now.
- Elton: What voltages are to be used for the spring 2018? Colin: Would like to take LED data at various voltages to establish gain vs voltage curves. (Mark and Colin will take dat today). Need about 10k events per run.
- Procedure: Use the measured gains using pi0 peaks and voltages during spring 2017 to predict new voltage to set new gains.
- Discussion about edge blocks (3 inner layers and 3 outer layers). Gains not determined during calibration. Need to get the best estimate in order to make HV adjustments.
- Matt: Could also use LED data to adjust relative gains with nearest neighbors, but we expect LED signal input variations due to light collection.
- Matt: On the longer time scale, would like to use MC to estimate leakage so that pi0 peaks can be adjusted to expected (degraded) position and calibrate accordingly.
- LED script (Mark)
- Modified Fcal LED pulser script to cycle at 10 min intervals at 10 Hz. Blue set to 29V; violet to 11.9 V and green to 9.9 V.
- Want to run at 2 voltages? Matt: Yes, but careful that outer pmts do not get too much light.
- Mark: How to choose voltages? -Match dynamic range to limit number of overflows for high light channels, but yet increase distance from pedestals for low light channels.
- Nonlinear correction in MC (Matt)
- Using photon particle gun. Plotted Ereconstructed/Egenerated vs Ereconstructed.
- Use piece-wise continuous linear+exponential function to fit non-linearity.
- Sacrificing the lowest point (0.25 GeV), function reproduces data < 0.75 GeV.
- Mark: The non-linearities should be calibrated in MC in the same was as data (eventually).
- Elton: Need a better matching at low energies if we are going to reconstruct showers down to 0.25 GeV, where corrected means are off by 6%.
- Finding the physics channels that require using low-energy photons can be used to drive the reevaluation of this correction.
- Matt: Could Sean take the constants in the log entry and add them to ccdb? Yes.
- CCDB block efficiency update (Elton)
- Added block efficiencies computed by Matt based on LED data to the ccdb.
- Peaks in efficiency can be found at zero efficiency (dead channels), and eff~0.6-0.7. This could be due to channels being on 2/3 of the time. Another possibility, mentioned by Matt is that 3 LED colors were used to compute efficiencies and then averaged. If 2 of the 3 LED signals were above threshold that would create the same result.
- Next step is to generate a large omega MC sample to check calibrations and overall scale in MC.
- Sean asked if Matt could check linearity to higher energies (e.g. 10 GeV) with adequate input data. Matt: Yes. Sean will ask Thomas to generate more events at higher energies.
- Other updates
- Photon Efficiency Update (Jon)
- Update on efficiency computations using gp->omega p, omega->pi+pi-pi0, pi0->g(g). Require one reconstructed gamma, E>0.5 GeV. Eliminate events with additional more than 2 clusters.
- Perform kinematic fit to reaction with one gamma missing. Select on kinematic CL for both samples with two reconstructed photons (numerator) and one or two reconstructed photons (denominator)
- Estimate efficiency by determining the ratio of events in the omega peak using recoil proton missing mass divided by the number in the omega invariant mass peak.
- Run preparations (Colin)
- BCAL update
- Run preparations
- Python libraries became corrupted in June and had to be fixed (David). LED pulser is now running again and Mark left instructions on the BCAL expert page.
- Other updates
- Run preparations
- Calibrations
- Tegan task is to compare calibrations using exclusive vs inclusive samples (but is in the middle of exams)
- Reconstruction and Simulation
- Zisis: Neutron reconstruction. Andrei continues to study this and will suggest best places to include neutron clusterizer code integrated into the neutral and charged particle clusterizers.
- Sean: Checking timing resolution for BCAL. Latest updates indicate that situation is ok, though not perfect. He has sent files to Mark for evaluation.
- BCAL non-linear corrections: Will to evaluate the latest MC updates and check non-linearities in MC using single photon particle gun.
- NIM articles
- Many comments received, which are being included into "final" draft. Elton and Zisis will talk next week to review final changes.
- Any other business