Difference between revisions of "Jun 26, 2012 Readout"
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##* The dark current measurements seem to be low. Data have been taken with the oscilloscope to cross check the measurements (in progress). | ##* The dark current measurements seem to be low. Data have been taken with the oscilloscope to cross check the measurements (in progress). | ||
## Light guides | ## Light guides | ||
+ | ##* Internal cracks (barely visible) developed in 400 of the type A light guides. The cracks are very small, but due to uncertainties of how they might develop, they are being fabricated again. | ||
+ | ##* Cracks happened during milling. Presumably this was due to locally produced heat during machining. The lubrication is a mixture of lubricant and coolant, not water, automatic feed from the machine. | ||
+ | ##* The cutting tool was changed and resolved this issue. It does not seem to be due the material. | ||
+ | ##* John: How many guides have been machined since the tool and process were fixed? Over 300. | ||
+ | ##* There have been some delays due to machine repairs | ||
+ | ##* Waiting for repairs, the process has been optimized and time per piece reduce by 20%. | ||
+ | ##* Status: 50% of guides are machined, 6% have polishing complete. All jigs have been complete, but guides HJK and A still need to be machined. | ||
+ | ##* Shipping: Expect the first shipment second week in July. | ||
# Status of testing at JLab | # Status of testing at JLab | ||
## [https://halldweb1.jlab.org/elog-halld/SiPM/ Hall-D ELOG]. | ## [https://halldweb1.jlab.org/elog-halld/SiPM/ Hall-D ELOG]. | ||
+ | ##* Inventory shown in log book entry. Many units are dispersed around the collaboration and test setups need to evaluated in relation to number of spares that might be available. | ||
+ | ##* Will has sent an inquiry to Hamamatsu to find out if we can order additional SiPMs at this time. No response yet. | ||
# Status of work at Regina | # Status of work at Regina | ||
## [[BCAL Beam Tests 2012]]: [https://halldweb1.jlab.org/wiki/images/f/f5/Edepos-meet120626.pdf Analysis & Simulations] (Andrei & Irina) | ## [[BCAL Beam Tests 2012]]: [https://halldweb1.jlab.org/wiki/images/f/f5/Edepos-meet120626.pdf Analysis & Simulations] (Andrei & Irina) | ||
+ | ##* Simulation shows a 10% resolution at 5 deg and 1.9 GeV. Data shows approximately 13% resolution. Analysis is ongoing. | ||
## BCAL Cosmics at Regina | ## BCAL Cosmics at Regina | ||
+ | ##* Detectors are being repaired and are almost ready to go. | ||
+ | ##* Students are getting trained in the process and preparing to come to JLab, They will be at the lab on July 10. | ||
# Other | # Other |
Revision as of 15:23, 26 June 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 and Canada
- +1-303-248-0285 : International
- then use participant code: 3421244# (the # is needed when using the phone)
- OR from www.readytalk.com type access code 3421244 into "join a meeting" without the # (you need java plugin)
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
- SiPMs
- Investigate the optimum overbias setting for the SiPMs (Serguei and Orlando)
Presentations from recent meetings
Tentative Agenda
- Announcements
- Review of Action Items
- Update from Athens: monitoring
- Update from USM
- SiPM Update (Javiera)
- Light guides
- Status of testing at JLab
- Status of work at Regina
- BCAL Beam Tests 2012: Analysis & Simulations (Andrei & Irina)
- BCAL Cosmics at Regina
- Other
Minutes
Attending: Elton, Beni, David, John, Ben, Yi, Tim (Jlab); Will, Javiera, Orlando, Iñaki (USM); Zisis, Andrei (UofR); Christina, George, Stratos (Athens)
- Announcements
- Students (and Zisis) from UofR arrive on July 9
- Review of Action Items
- Update from Athens: monitoring
- SiPMs for testing. One in regular mail (needs to be tracked down) and 3 to be hand-carried by George
- Orders
- Requests have been made, but little response.
- Update from USM
- SiPM Update (Javiera)
- Fourth shipment from Hamamatsu arrived on June 20
- All units from first three shipments completed in stage 3. Starting to test 4th shipment
- 265 units PDE measured in stage 2. 15 more required to complete all measurements
- Zisis: request a summary table from Javiera during update.
- Discussion on what information must be provided on the tested SiPMs
- Will: Suggestion to provide a dump of the data base for each shipment delivered. Note that this is simply a snapshot in time that can change when analyses are updated.
- Consider various options for concise summaries also.
- Yi: JLab has three tables a) specification and Hamamatsu data b) All run information and raw data c) summary of measurements
- Failed units: one from USM with a dead channel, one from JLab that fails to meet one of the specifications.
- Contract and pulse shape
- Pulse shape measurements are dominated by the response of the JLab preamps. Is is worth doing these systematically
- Elton: Checking signals on scope can be very informative.
- Revisiting the dark current measurements (Orlando)
- The dark current measurements seem to be low. Data have been taken with the oscilloscope to cross check the measurements (in progress).
- Light guides
- Internal cracks (barely visible) developed in 400 of the type A light guides. The cracks are very small, but due to uncertainties of how they might develop, they are being fabricated again.
- Cracks happened during milling. Presumably this was due to locally produced heat during machining. The lubrication is a mixture of lubricant and coolant, not water, automatic feed from the machine.
- The cutting tool was changed and resolved this issue. It does not seem to be due the material.
- John: How many guides have been machined since the tool and process were fixed? Over 300.
- There have been some delays due to machine repairs
- Waiting for repairs, the process has been optimized and time per piece reduce by 20%.
- Status: 50% of guides are machined, 6% have polishing complete. All jigs have been complete, but guides HJK and A still need to be machined.
- Shipping: Expect the first shipment second week in July.
- SiPM Update (Javiera)
- Status of testing at JLab
- Hall-D ELOG.
- Inventory shown in log book entry. Many units are dispersed around the collaboration and test setups need to evaluated in relation to number of spares that might be available.
- Will has sent an inquiry to Hamamatsu to find out if we can order additional SiPMs at this time. No response yet.
- Hall-D ELOG.
- Status of work at Regina
- BCAL Beam Tests 2012: Analysis & Simulations (Andrei & Irina)
- Simulation shows a 10% resolution at 5 deg and 1.9 GeV. Data shows approximately 13% resolution. Analysis is ongoing.
- BCAL Cosmics at Regina
- Detectors are being repaired and are almost ready to go.
- Students are getting trained in the process and preparing to come to JLab, They will be at the lab on July 10.
- BCAL Beam Tests 2012: Analysis & Simulations (Andrei & Irina)
- Other