Difference between revisions of "Feb 28, 2012 Calorimetry"
From GlueXWiki
(→Items for followup from previous meeting(s)) |
(→Minutes) |
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# Review of Action Items | # Review of Action Items | ||
# Monitoring. [[Media:FirstLEDassemblies.ppt]] | # Monitoring. [[Media:FirstLEDassemblies.ppt]] | ||
+ | #* 40 Bcal boards received and tested. Ready to ship | ||
+ | #* Gain variation measured with 6x6 mm2 photodiode. Signal sizes range from 0.6-1.2 V | ||
+ | #* Could investigate grouping the LEDs according to intensity | ||
+ | #* Eugene: Asked about uniformity of light output at the near side. Athens agreed to study the systematics and robustness of assembly. | ||
+ | #* Christina: Indicated that the "flexible" cable is not very flexible and might need modification for the final setup. | ||
# FCAL | # FCAL | ||
## Construction Status: mechanical, bases (notes from Matt) | ## Construction Status: mechanical, bases (notes from Matt) | ||
Line 70: | Line 75: | ||
##* Showed data showing fits that indicate that the x-talk depends on temperature, however there are several reasons that the data sets are not directly comparable. | ##* Showed data showing fits that indicate that the x-talk depends on temperature, however there are several reasons that the data sets are not directly comparable. | ||
##* Yi: Conducted several fitting tests. Finds that a fit to the entire spectrum is independent of temperature, but fits to 3 peaks (method used by USM) at a time show some systematics. | ##* Yi: Conducted several fitting tests. Finds that a fit to the entire spectrum is independent of temperature, but fits to 3 peaks (method used by USM) at a time show some systematics. | ||
− | ##* Problem solved: Orlando | + | ##* Issue: Jump in apparent amplifier gains: Problem solved: Orlando found that a positive-going tail from the preamplifier causes the V792 ADC to misbehave. |
# TDR update | # TDR update | ||
## [[Private:Instructions for the TDR | Instructions for the TDR]] (You must be logged into the wiki to access this page). | ## [[Private:Instructions for the TDR | Instructions for the TDR]] (You must be logged into the wiki to access this page). | ||
## We need to start revising Chapter 4 Detector, Section 4.3 Calorimetry. | ## We need to start revising Chapter 4 Detector, Section 4.3 Calorimetry. | ||
+ | ##* No update this time. | ||
# Simulations/Reconstruction | # Simulations/Reconstruction | ||
# Any other business | # Any other business |
Revision as of 19:29, 28 February 2012
Teleconference Time: 11:00 a.m. EST'
- ESNET (Number is 8542553) and EVO session (GlueX Calorimetry meeting room)
- Phone connection only upon request.
- +1-866-740-1260 : US+Canada
- +1-303-248-0285 : International
- then enter participant code: 3421244# (remember the "#").
- or www.readytalk.com (and code without the #)
Contents
Participant Direct Lines
- JLab Phone: in CC F326 is 757-269-6337 (usual room)
- JLab Phone in CC L207 is 757-269-7084
- Phone in the Regina Videoconference Suite is 306-585-4204
- Athens Phone: in Christina's office is 011-30-210-727-6947
Items for followup from previous meeting(s)
- Monitoring
- Send additional SiPMs to Athens for tests (Elton). Boards have been fabricated, but still need testing.
Tentative Agenda
- Announcements
- Review of Action Items
- Monitoring. Media:FirstLEDassemblies.ppt
- FCAL
- Construction Status: mechanical, bases (notes from Matt)
- Paul and I both visited Total Electronics (the vendor for the CW bases) last Thursday. We went through a variety of issues regarding coating and assembly. They appear to understand where their procedure is deficient. Again, they are saying all the right things. The big question is: will the next batch of boards show improvements in production quality? We'll see.
- Beam tests in Hall B (John)
- small note on distance from CLAS scintillators by Kei
- Construction Status: mechanical, bases (notes from Matt)
- BCAL
- BCAL Beam Tests 2012
- LG gluing schedule and LED attachment by tape
- BCAL Beam Tests 2012
- USM update
- TDR update
- Instructions for the TDR (You must be logged into the wiki to access this page).
- We need to start revising Chapter 4 Detector, Section 4.3 Calorimetry.
- Simulations/Reconstruction
- Any other business
Minutes
Attending: Elton, Eugene, John D., Beni, Yi, David, Sasah, Tim, John L. (JLab); Christina, George, Pavols (Athens); Zisis, George (UofR); Will, Hayk, Javiera, Sergei, Orlando (USM);
- Announcements
- Review of Action Items
- Monitoring. Media:FirstLEDassemblies.ppt
- 40 Bcal boards received and tested. Ready to ship
- Gain variation measured with 6x6 mm2 photodiode. Signal sizes range from 0.6-1.2 V
- Could investigate grouping the LEDs according to intensity
- Eugene: Asked about uniformity of light output at the near side. Athens agreed to study the systematics and robustness of assembly.
- Christina: Indicated that the "flexible" cable is not very flexible and might need modification for the final setup.
- FCAL
- Construction Status: mechanical, bases (notes from Matt)
- Paul and I both visited Total Electronics (the vendor for the CW bases) last Thursday. We went through a variety of issues regarding coating and assembly. They appear to understand where their procedure is deficient. Again, they are saying all the right things. The big question is: will the next batch of boards show improvements in production quality? We'll see.
- Beam tests in Hall B (John)
- small note on distance from CLAS scintillators by Kei
- John reported that they are sorting out the combined Hall B/Fcal data taken. The data with the Fcal trigger looks good. The data with the T-counter triggers have very few hits. Will likely request additional data be taken once all the issues with the present data set are understood.
- Construction Status: mechanical, bases (notes from Matt)
- BCAL
- BCAL Beam Tests 2012
- LG gluing schedule and LED attachment by tape
- Sasha has added the list of electronics to the wiki
- BCAL Beam Tests 2012
- USM update
- Production Manager Report (Javiera)
- Javiera compared data for the width the rise time of pulses taken with the array inserted upside-down. The systematics shown last week follow the electronic channel indicating that it is probably due to the amplifiers (not the sensor).
- Also showed scope traces for the summed array output illuminating the entire array and illuminating a single cell. The widths were only slightly less for the single cell.
- Station 3: Crosstalk vs. temperature (Hayk)
- Only 5 positions in stage with with remaining problems.
- Showed data showing fits that indicate that the x-talk depends on temperature, however there are several reasons that the data sets are not directly comparable.
- Yi: Conducted several fitting tests. Finds that a fit to the entire spectrum is independent of temperature, but fits to 3 peaks (method used by USM) at a time show some systematics.
- Issue: Jump in apparent amplifier gains: Problem solved: Orlando found that a positive-going tail from the preamplifier causes the V792 ADC to misbehave.
- Production Manager Report (Javiera)
- TDR update
- Instructions for the TDR (You must be logged into the wiki to access this page).
- We need to start revising Chapter 4 Detector, Section 4.3 Calorimetry.
- No update this time.
- Simulations/Reconstruction
- Any other business