Difference between revisions of "GlueX Start Counter Meeting, December 9, 2021"
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GlueX Start Counter Meeting<br/> | GlueX Start Counter Meeting<br/> | ||
| − | Thursday, | + | Thursday, December 9, 2021<br/> |
| − | 10:00 am | + | 10:00 am EST<br/> |
[https://jlab.bluejeans.com/ BlueJeans]: [https://bluejeans.com/556286544 556 286 544] | [https://jlab.bluejeans.com/ BlueJeans]: [https://bluejeans.com/556286544 556 286 544] | ||
| Line 7: | Line 7: | ||
# Announcements | # Announcements | ||
| − | # Review of [[GlueX Start Counter Meeting, | + | # Review of [[GlueX Start Counter Meeting, October 14, 2021#Minutes|minutes from the last meeting]] |
# Run report | # Run report | ||
# Resolution and Calibration | # Resolution and Calibration | ||
| Line 14: | Line 14: | ||
== Minutes == | == Minutes == | ||
| − | Present: | + | Present: Eugene Chudakov, Mark Ito, Igal Jaegle, Simon Taylor, Beni Zihlmann |
| − | There is [https://bluejeans.com/s/ | + | There is [https://bluejeans.com/s/3xt7NebOwNA a recording of this meeting] on the BlueJeans site. Use your JLab credentials to gain access. |
| − | + | === Review of minutes from the last meeting === | |
| − | + | We went over the [[GlueX Start Counter Meeting, October 14, 2021#Minutes|minutes from the meeting on October 14th]] without significant comment. | |
| − | + | ||
| − | + | === Run report === | |
| + | |||
| + | Beni showed evidence of increased dark noise in the SiPMs. He looks at a statistic that is sensitive to a high-side tail of the pedestal distribution taken from beam-off data in raw mode. The higher the dark noise, the lower the statistic. This measure was explained at a [[GlueX_Start_Counter_Meeting,_March_21,_2019#SiPM_dark_rate_measurement|previous start counter meeting]]. There is a clear trend, year-to-year, of increased dark noise. | ||
| + | |||
| + | [[File:Paddle response p1.gif|border]]<br> | ||
| + | Pedestal distributions showing high-side tails.<br> | ||
| + | <br> | ||
| + | [[File:Sc darkratetest.gif|border]]<br> | ||
| + | Statistic as a function of run number<br> | ||
| + | |||
| + | We discussed possible ameliorations, including replacing the SiPMs. We are nowhere near deciding on that course of action; more study is needed. | ||
| + | |||
| + | === Calibration === | ||
| + | |||
| + | Mark will try to round up some volunteers to calibrate the start counter for the PrimEx and SRC runs. | ||
Latest revision as of 21:07, 11 December 2021
GlueX Start Counter Meeting
Thursday, December 9, 2021
10:00 am EST
BlueJeans: 556 286 544
Contents
Agenda
- Announcements
- Review of minutes from the last meeting
- Run report
- Resolution and Calibration
- Action Item Review
Minutes
Present: Eugene Chudakov, Mark Ito, Igal Jaegle, Simon Taylor, Beni Zihlmann
There is a recording of this meeting on the BlueJeans site. Use your JLab credentials to gain access.
Review of minutes from the last meeting
We went over the minutes from the meeting on October 14th without significant comment.
Run report
Beni showed evidence of increased dark noise in the SiPMs. He looks at a statistic that is sensitive to a high-side tail of the pedestal distribution taken from beam-off data in raw mode. The higher the dark noise, the lower the statistic. This measure was explained at a previous start counter meeting. There is a clear trend, year-to-year, of increased dark noise.
Pedestal distributions showing high-side tails.
Statistic as a function of run number
We discussed possible ameliorations, including replacing the SiPMs. We are nowhere near deciding on that course of action; more study is needed.
Calibration
Mark will try to round up some volunteers to calibrate the start counter for the PrimEx and SRC runs.
