Difference between revisions of "Sep 7, 2017 Calorimeter"
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= Action Items = | = Action Items = | ||
− | # 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 | # Add Fcal dead channels into the MC | ||
− | # Matt will send a question to Sean on how tightly the calibration constants are coupled to the software version. | + | # <strike> Matt will send a question to Sean on how tightly the calibration constants are coupled to the software version. </strike> Matt contacted Sean and there is no direct coupling between constants and software versions. |
= References = | = References = | ||
Line 36: | Line 36: | ||
# FCAL Update | # FCAL Update | ||
## [https://halldweb.jlab.org/wiki/images/5/5c/MStaibFCALGains7Sep2017.pdf FCAL Gains] - Mike | ## [https://halldweb.jlab.org/wiki/images/5/5c/MStaibFCALGains7Sep2017.pdf FCAL Gains] - Mike | ||
− | ## [[Media:Fcal_7sep2017.pdf | FCAL Update]] | + | ## [[Media:Fcal_7sep2017.pdf | FCAL Update (Matt)]] |
# BCAL update | # BCAL update | ||
# Calibrations | # Calibrations | ||
Line 46: | Line 46: | ||
= Minutes = | = Minutes = | ||
− | ''Attendees: | + | ''Attendees: Elton, Mark, Colin Gleason (JLab); Matt, Jon (IU); Ahmed, Tegan, Andrei (UofR); Will, Mike, Curtis (CMU); Christina, George (Athens); Sean (NW). |
+ | |||
+ | # Announcements | ||
+ | #* Colin Gleason is replacing Adesh as IU's representative at JLab. Welcome! | ||
+ | # Action Items | ||
+ | # Activities during the down | ||
+ | # FCAL Update | ||
+ | ## [https://halldweb.jlab.org/wiki/images/5/5c/MStaibFCALGains7Sep2017.pdf FCAL Gains] - Mike | ||
+ | ##* Investigating omega sample (2016) and occupancies in FCAL near beam hole | ||
+ | ##* Finds that apparent inefficient channels are due to mis-calibration in regions where FCAL blocks were excluded from the trigger. | ||
+ | ##* Borrowed Will's new procedure for determining BCAL gains using a histogram-fit-adjust method instead of the original bootstrap method. | ||
+ | ##* New method shows that inner blocks can be calibrated and recovered in analysis. | ||
+ | ##* Note that 2017 data shows similar problems | ||
+ | ##* Matt: Need to use new method to determine accurate gains, which can be used to set new HV for the upcoming run. | ||
+ | ## [[Media:Fcal_7sep2017.pdf | FCAL Update (Matt)]] | ||
+ | ##* Changes to geometry and MC using Richard's help: a) steel straps around blocks, b) size of blocks, c) light tight cover, d) add light guide as sensitive region in MC | ||
+ | ##* Changes to block spacing (4.000 -> 4.016 cm) changes reconstructed pi0 mass and therefore affects gain determination. | ||
+ | ##* Would like to use Mike's new hist-fit-adjust method with new geometry to get new set of gains. | ||
+ | ##* Changes to code are currently on a branch. Sean: When to merge? Matt: does not have a strong preference except to determine new gains will all new inputs at the same time. | ||
+ | ##* Timing: current algorithm takes the time of the largest energy block (sigma~0.3 ns). improved algorithm: uses energy weighted times of hit blocks (sigma~0.25 ns). Both estimate are energy dependent. Timing in MC is a constant sigma~0.4 ns. | ||
+ | ##* Matt: Asked Mark about study to investigate eta resolution in Fcal. In particular, what is the constant term? (FCAL data seems to indicate a high 6-7 % constant term). Mark: Will report back on results of eta study in FCAL. | ||
+ | # BCAL update | ||
+ | # Calibrations | ||
+ | # Reconstruction and Simulation | ||
+ | ## [[2017 mcsmear Workplan]] | ||
+ | # NIM articles | ||
+ | ## Bcal | ||
+ | ##* Elton posted the latest draft of the BCAL NIM paper on the portal ([https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=3385 GlueX-doc-3385) | ||
+ | ##* MC analysis of pi0 data (Will) yields a very small constant term (~1%), and eta data (Mark) yields a constant term of about 4%. The MC has been updated with a constant term of about 3.7. What is the discrepancy? | ||
+ | ##* Will confirmed that he is using the latest MC with the large constant term. | ||
+ | ##* Mark: It could be that the 3.7% constant term for individual cells averages out to a smaller value. This should be investigated. | ||
+ | ##* Mark: The pi0 plot is one of the difference between generated-true values, while the eta data is extracted from measurements. This plot can also be made for eta MC for comparison. | ||
+ | # Any other business |
Latest revision as of 13:36, 7 September 2017
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 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 will send a question to Sean on how tightly the calibration constants are coupled to the software version.Matt contacted Sean and there is no direct coupling between constants and software versions.
References
- FCAL HDFCAL log book
- BCAL HDBCAL log book
Tentative Agenda
- Announcements
- Action Items
- Activities during the down
- FCAL Update
- FCAL Gains - Mike
- FCAL Update (Matt)
- BCAL update
- Calibrations
- Reconstruction and Simulation
- NIM articles
- Any other business
Minutes
Attendees: Elton, Mark, Colin Gleason (JLab); Matt, Jon (IU); Ahmed, Tegan, Andrei (UofR); Will, Mike, Curtis (CMU); Christina, George (Athens); Sean (NW).
- Announcements
- Colin Gleason is replacing Adesh as IU's representative at JLab. Welcome!
- Action Items
- Activities during the down
- FCAL Update
- FCAL Gains - Mike
- Investigating omega sample (2016) and occupancies in FCAL near beam hole
- Finds that apparent inefficient channels are due to mis-calibration in regions where FCAL blocks were excluded from the trigger.
- Borrowed Will's new procedure for determining BCAL gains using a histogram-fit-adjust method instead of the original bootstrap method.
- New method shows that inner blocks can be calibrated and recovered in analysis.
- Note that 2017 data shows similar problems
- Matt: Need to use new method to determine accurate gains, which can be used to set new HV for the upcoming run.
- FCAL Update (Matt)
- Changes to geometry and MC using Richard's help: a) steel straps around blocks, b) size of blocks, c) light tight cover, d) add light guide as sensitive region in MC
- Changes to block spacing (4.000 -> 4.016 cm) changes reconstructed pi0 mass and therefore affects gain determination.
- Would like to use Mike's new hist-fit-adjust method with new geometry to get new set of gains.
- Changes to code are currently on a branch. Sean: When to merge? Matt: does not have a strong preference except to determine new gains will all new inputs at the same time.
- Timing: current algorithm takes the time of the largest energy block (sigma~0.3 ns). improved algorithm: uses energy weighted times of hit blocks (sigma~0.25 ns). Both estimate are energy dependent. Timing in MC is a constant sigma~0.4 ns.
- Matt: Asked Mark about study to investigate eta resolution in Fcal. In particular, what is the constant term? (FCAL data seems to indicate a high 6-7 % constant term). Mark: Will report back on results of eta study in FCAL.
- FCAL Gains - Mike
- BCAL update
- Calibrations
- Reconstruction and Simulation
- NIM articles
- Bcal
- Elton posted the latest draft of the BCAL NIM paper on the portal ([https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=3385 GlueX-doc-3385)
- MC analysis of pi0 data (Will) yields a very small constant term (~1%), and eta data (Mark) yields a constant term of about 4%. The MC has been updated with a constant term of about 3.7. What is the discrepancy?
- Will confirmed that he is using the latest MC with the large constant term.
- Mark: It could be that the 3.7% constant term for individual cells averages out to a smaller value. This should be investigated.
- Mark: The pi0 plot is one of the difference between generated-true values, while the eta data is extracted from measurements. This plot can also be made for eta MC for comparison.
- Bcal
- Any other business