July 29, 2010 Readout
From GlueXWiki
Teleconference Time: 11:00 a.m. EST
- ESNET and EVO session
- Phone in CC L207 is 757-269-7084
- Phone:
- +1-800-377-8846 : US
- +1-888-276-7715 : Canada
- +1-302-709-8424 : International
- then enter participant code: 77438230# (remember the "#"). Phone connection only upon request.
Contents
Items for followup from previous meeting
- Testing goals and setup (Serguei)
- Will to find out if there is any feedback from USM on terms and conditions from our procurement package.
- Will to update statement of work for USM contract and develop detailed schedule.
- Collect this information of testing on the wiki for ease of presenting information. (USM)
Documents to Review
Tentative Agenda
- Announcements
- Review of Action Items
- Bcal thresholds and resolution at low energies (PDF Slides) (Matt)
- SiPM Radiation Hardness Test (Update from Yi)
- Geometry
- Light Guide Gluing (Chuck)
- SiPM positioning (Chuck)
- Update - USM
- Status of statement of work (SOW)
- Simulation runs
- Cosmic-ray setup at UofR
- Light guides
Minutes
Attendees: Yi, Fernando, Beni, John, Elton, Eugene, Chuck (JLab); Matt, Dan (IU); Andrei, George (UofR); Pedro (USM).
- Announcements
- Review of Action Items
- Bcal thresholds and resolution at low energies (PDF Slides) (Matt)
- Model resolutions using MC reconstruction
- Use old geometry (no summing, inner segments SiPMs, outer segments FM pmts)
- Optimistic, since summing will likely degrade performance. Dan is implementing the new scheme and will rerun programs when complete.
- New normalization comes from Andrei, corresponds to 165 photons/MeV in fiber/side compared to nominal 75 photons/MeV in fiber/side.
- Results show that a factor of 10 increase in dark current changes resolution sigma by about a factor of 2.
- Estimation of Cross Talk GueX-doc-1553 (Yi)
- SiPM Radiation Hardness Test#Test with RadCon AmBe Source (Update from Yi)
- See page for details. Radiation tests with RadCon calibrated AmBe neutron source (En ~1-10 MeV).
- SiPM Radiation Hardness Test#Fluence simulation of Hall D gives an estimated 6.5 years for SiPMs (at 10**7 s/year) to increase dark rate by a factor of 10.
- One anomalous 1x1mm2 cell irradiated in Hall A shows a dark rate increase by factors of 4 higher than other measurements and needs checking.
- Additional checks needed:
- Check annealing time for 1 and 9mm2 units irradiated with RadCon source
- (Beni) Check if increasing temperature helps annealing process
- Check temperature dependence of annealing
- (Eugene) Silicon micro-strips at CERN are kept cold ( about -70 deg) to increase radiation hardness from krad to Mrad. (Freeze out defects?) It is worth understanding the mechanism.
- Geometry
- Light Guide Gluing (Chuck)
- Check options for gluing guides on module before installation into magnet
- Consider not gluing guides to each other using a band to secure them at the base and the fitted plate with square holes at the other end.
- SiPM positioning (Chuck)
- Make window opening for sensor large enough so that it does not impede adjustment of distance between sensor and guide
- Next: must design the gas volume for dry air (or nitrogen), as well as scheme to avoid problems with condensation.
- Update - USM
- No report.
- Simulation runs
- Cosmic-ray setup at UofR
- Light guides