Difference between revisions of "JEF meeting, February 7, 2020"
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* Status of the crystal production (SICCAS) | * Status of the crystal production (SICCAS) | ||
* Status of PMT checks | * Status of PMT checks | ||
− | * [https://halldweb.jlab.org/detectors/fcal2 Estimates of the anode current] | + | * [https://halldweb.jlab.org/detectors/fcal2/anode_current.pptx Estimates of the anode current] |
* [https://halldweb.jlab.org/wiki/index.php/Module_Design Preparation for module fabrication] | * [https://halldweb.jlab.org/wiki/index.php/Module_Design Preparation for module fabrication] | ||
+ | |||
+ | =Minutes= | ||
+ | Attendees: Igal, Arshak, Phil, Josh, Zisis, Jane, Liping, Vlad B., Tim W., Tim B., Sasha, S.T. | ||
+ | *TEDF setup: almost ready to go, network connection still pending. Here are a couple of photographs: [https://logbooks.jlab.org/entry/3779017]. | ||
+ | ** Safety documentation in the works... | ||
+ | ** Radioactive source needs container | ||
+ | ** Oven used for pre-shaping ESR wrapping is taking 1-2 hours to heat up was raised as a potential construction efficiency issue | ||
+ | *** Can be mitigated by planning the work appropriately. | ||
+ | *** Can in principle borrow usage of an oven owned by Hall B. | ||
+ | * Lab has money for buying 600 more crystals, but might need a new contract | ||
+ | * Contract with Wuhan is still not fully on the real sheet | ||
+ | * Batch of PMTs all checked for dimensions, 18-20% do not meet our spec | ||
+ | ** Tim B. might take some PMTs back with him the week of 1/10- to do other checks at UNCW | ||
+ | * We went over various items in Sasha's module fabrication materials spreadsheet | ||
+ | ** CMU is setting up to construct the steel PMT housing, when ready of mass production can produce ~150/month | ||
+ | ** Received quote for 350 micron mu-metal | ||
+ | ** Received several quotes for 50 micron mu metal | ||
+ | ** Considered using a few layers of 100 micron mu-metal instead of 350+50, might be an order of magnitude cheaper | ||
+ | ** Brass strips on order | ||
+ | ** 500 brass flanges on order | ||
+ | ** PMT tension plates: 2 samples in house, 3 quotes | ||
+ | ** Kapton is here | ||
+ | ** Two ideas for light guides: 18 mm diameter stock item verses 18.8 mm that would need to be machined: factor of 2 difference in price, machining would add $12k | ||
+ | * Sasha reported results of his PMT anode current study. | ||
+ | ** Gain of 24 currently in use for CCAL is too high, could work with much lower gain, say 2-3x. | ||
+ | ** Maybe use this lower gain setting for the inner part of FCAL2, use "active bases without dividers" for rest? | ||
+ | ** Plan to do more studies with CCAL: 3x and 6x amplification | ||
+ | ** Baseline shifts are an issue in flashADC due to AC coupling |
Latest revision as of 11:48, 10 February 2020
Meeting time and location= 10:00 am EST (JLab time) CC-F226
Connection instructions
We are using BlueJeans Video/Audio conferencing. Our meeting ID number is 992533564. Click "Expand" for more details.
- Make sure you have created a BlueJeans account via your JLab CUE account using this link:
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Agenda
- Infrastructure update (TEDF, light yield setup, etc.)
- Status of the crystal production (SICCAS)
- Status of PMT checks
- Estimates of the anode current
- Preparation for module fabrication
Minutes
Attendees: Igal, Arshak, Phil, Josh, Zisis, Jane, Liping, Vlad B., Tim W., Tim B., Sasha, S.T.
- TEDF setup: almost ready to go, network connection still pending. Here are a couple of photographs: [1].
- Safety documentation in the works...
- Radioactive source needs container
- Oven used for pre-shaping ESR wrapping is taking 1-2 hours to heat up was raised as a potential construction efficiency issue
- Can be mitigated by planning the work appropriately.
- Can in principle borrow usage of an oven owned by Hall B.
- Lab has money for buying 600 more crystals, but might need a new contract
- Contract with Wuhan is still not fully on the real sheet
- Batch of PMTs all checked for dimensions, 18-20% do not meet our spec
- Tim B. might take some PMTs back with him the week of 1/10- to do other checks at UNCW
- We went over various items in Sasha's module fabrication materials spreadsheet
- CMU is setting up to construct the steel PMT housing, when ready of mass production can produce ~150/month
- Received quote for 350 micron mu-metal
- Received several quotes for 50 micron mu metal
- Considered using a few layers of 100 micron mu-metal instead of 350+50, might be an order of magnitude cheaper
- Brass strips on order
- 500 brass flanges on order
- PMT tension plates: 2 samples in house, 3 quotes
- Kapton is here
- Two ideas for light guides: 18 mm diameter stock item verses 18.8 mm that would need to be machined: factor of 2 difference in price, machining would add $12k
- Sasha reported results of his PMT anode current study.
- Gain of 24 currently in use for CCAL is too high, could work with much lower gain, say 2-3x.
- Maybe use this lower gain setting for the inner part of FCAL2, use "active bases without dividers" for rest?
- Plan to do more studies with CCAL: 3x and 6x amplification
- Baseline shifts are an issue in flashADC due to AC coupling