Difference between revisions of "Sep 2, 2008 Calorimetry"
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=Minutes= | =Minutes= | ||
− | Attending: | + | Attending: Athens: Christina, George, Pavlos; UofR: Zisis, George, Kathryn, Blake; JLab: Elton, Beni, Tim, Fernando; IU: Matt, Mijahlo, Claire Tareert; FIU: Werner. |
+ | |||
+ | == Announcements == | ||
+ | * Claire Tareert is a new research associate at IU. Welcome! | ||
+ | == Review of Calibration Issues == | ||
+ | * Athens update report: [http://argus.phys.uregina.ca/cgi-bin/private/DocDB/ShowDocument?docid=1092 GlueX-doc-1092] | ||
+ | * Christina went over the posted presentation | ||
+ | # First the laser option was presented | ||
+ | #* APD used to monitor the absolute light from the laser, but noise pick up from the laser was a problem. Elton indicated that a full shield was necessary to shield the laser. Method for shielding similar laser can be found on the bottom of page 3 of Hall B [http://www.jlab.org/Hall-B/notes/clas_notes91/note91-002.pdf CLAS-NOTE 91-002]. | ||
+ | # The second LED option was presented. | ||
+ | #* 2x1 cm2 boards with the LED and pulsing electronics have been made; 35 boards produced. | ||
+ | #* The idea is to place the boards near each pmt to be calibrated, e.g. on the light guide of the SiPMs. George: could be placed on the tapered length of the guide. | ||
+ | #* Fernando asked about the temperature dependence: it has not yet been measured. | ||
+ | #* Control board (for about 30 LEDs) has been constructed and would be placed about 2-3 m away from the LED. | ||
+ | #* Question about masking individual channels for firing? This would check (optical) cross talk between channels. | ||
+ | #* The calibration system needs to have its requirements clearly defined. Each subsystem (Fcal, Bcal, Start counter) reviewed its requirements, but further refinement is necessary. | ||
+ | #* Elton prepared the following table to clarify the requirements. We need to complete it to provide adequate feedback to Athens: | ||
+ | == Reports== | ||
+ | * [[Fiber Test Stand at JLAB]] (Beni) | ||
+ | * [[Fiber Tests at Regina]] (Kathryn) |
Revision as of 12:58, 2 September 2008
- Phone:
- +1-800-377-8846 : US
- +1-888-276-7715 : Canada
- +1-302-709-8424 : International
- then enter participant code: 39527048# (remember the "#")
Contents
Items for followup from last meeting
- George: report on trip to Edmonton
- Estimates of pedestal width (electronic noise, etc.) for FM PMTs. The dark rate should be negligigle in this case.
- Resolution studies with up-to-date geometry (Blake) ONGOING
- Resolution studies with different segmentation for the outer section. - LOWER PRIORITY
- Add F100 rad hard glass to simulation. - Matt will do this
- Decision on Bcal sampling fraction needed by Sep. - Work by Stamatis (on vacation) will be summarized upon his return.
Documents to Review
- Please place documents here for review in advance of meeting
- Calibration-Monitoring
- Paul Smith's Fiber Pulser
Tentative Agenda
Note: This meeting will be dedicated to reviewing calibration issues. Other reports will be included as time permits.
- Announcements
- Review of Calibration Issues
- Athens update report: GlueX-doc-1092
- Reports
- Fiber Test Stand at JLAB (Beni)
- Fiber Tests at Regina (Kathryn)
- Updates
- FCAL
- BCAL
- Comments on the collaboration meeting. Suggestions from last meeting
- Any other business
Minutes
Attending: Athens: Christina, George, Pavlos; UofR: Zisis, George, Kathryn, Blake; JLab: Elton, Beni, Tim, Fernando; IU: Matt, Mijahlo, Claire Tareert; FIU: Werner.
Announcements
- Claire Tareert is a new research associate at IU. Welcome!
Review of Calibration Issues
- Athens update report: GlueX-doc-1092
- Christina went over the posted presentation
- First the laser option was presented
- APD used to monitor the absolute light from the laser, but noise pick up from the laser was a problem. Elton indicated that a full shield was necessary to shield the laser. Method for shielding similar laser can be found on the bottom of page 3 of Hall B CLAS-NOTE 91-002.
- The second LED option was presented.
- 2x1 cm2 boards with the LED and pulsing electronics have been made; 35 boards produced.
- The idea is to place the boards near each pmt to be calibrated, e.g. on the light guide of the SiPMs. George: could be placed on the tapered length of the guide.
- Fernando asked about the temperature dependence: it has not yet been measured.
- Control board (for about 30 LEDs) has been constructed and would be placed about 2-3 m away from the LED.
- Question about masking individual channels for firing? This would check (optical) cross talk between channels.
- The calibration system needs to have its requirements clearly defined. Each subsystem (Fcal, Bcal, Start counter) reviewed its requirements, but further refinement is necessary.
- Elton prepared the following table to clarify the requirements. We need to complete it to provide adequate feedback to Athens:
Reports
- Fiber Test Stand at JLAB (Beni)
- Fiber Tests at Regina (Kathryn)