Difference between revisions of "July 29, 2010 Readout"
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# Announcements | # Announcements | ||
# Review of Action Items | # Review of Action Items | ||
− | # Bcal thresholds and resolution at low energies (Matt) | + | # Bcal thresholds and resolution at low energies ([http://dustbunny.physics.indiana.edu/~mashephe/bcal_dkrate.pdf PDF Slides]) (Matt) |
# [[SiPM Radiation Hardness Test]] (Update from Yi) | # [[SiPM Radiation Hardness Test]] (Update from Yi) | ||
# Geometry | # Geometry | ||
# [http://www.jlab.org/~huttonc/gluing.pptx Light Guide Gluing] (Chuck) | # [http://www.jlab.org/~huttonc/gluing.pptx Light Guide Gluing] (Chuck) | ||
− | # [http://www.jlab.org/~huttonc/ | + | # [http://www.jlab.org/~huttonc/HAMSEAT.pptx SiPM positioning] (Chuck) |
# Update - USM | # Update - USM | ||
#* Status of statement of work (SOW) | #* Status of statement of work (SOW) | ||
Line 34: | Line 34: | ||
= Minutes = | = Minutes = | ||
− | Attendees: | + | 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 ([http://dustbunny.physics.indiana.edu/~mashephe/bcal_dkrate.pdf 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. | ||
+ | # [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=1553 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 | ||
+ | # [http://www.jlab.org/~huttonc/gluing.pptx 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. | ||
+ | # [http://www.jlab.org/~huttonc/HAMSEAT.pptx 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 | ||
+ | #* Will complete tests with calibrated pmt | ||
+ | #* Next measure response using SiPM array, air gap with a) WC and b) trapezoidal guides |
Latest revision as of 17:13, 24 February 2017
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
- Will complete tests with calibrated pmt
- Next measure response using SiPM array, air gap with a) WC and b) trapezoidal guides