Difference between revisions of "JEF meeting, February 7, 2020"

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* [https://halldweb.jlab.org/detectors/fcal2/anode_current.pptx 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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  • If connecting via Phone: Dial one of the following numbers and then enter the meeting ID above and hit "#" or "##"
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    • Enter meeting ID above

Agenda

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
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