JEF meeting, September 8, 2017

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Meeting time and location= 10:30 EST (JLab time) CC-L207

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  • CompCAL/FCAL II strategy


Attendees: Eugene C., Liping G., Alex S., Simon T.

  • We discussed two main options for proceeding:
  1. Build FCAL-II insert "from scratch"
    1. Worst case scenario is that we would have to find funding for purchasing ~2500 lead tungstate crystals.
    2. Disassembling and reassembling FCAL with the new crystals is a major undertaking: need cost/manpower/time estimates
    3. It may be possible to use Hall C crystals after they are done with them, but this is very uncertain.
    4. It is unlikely we will be able to use the existing HyCAL (except maybe as-is for the eta-Primakoff experiment); Eugene has contacted Ashot, no word yet.
  2. Recycle CMS endcap crystals.
    1. The time frame for CMS to remove them and make them ready for other people to use may be ~5 years
    2. The crystals have suffered radiation damage and would need to be annealed.
    3. Due to their truncated pyramid shape, stacking is an issue that needs to be addressed.
    4. The dimensions are a bit larger than the lead tungstate insert solution we originally proposed, so the resolution would be a bit worse and needs to be studied.
    5. A suitable readout solution is needed: APDs? PMTs?
  • Need to present scenarios to management (cost+time)