General Meeting Summary 11/12/15

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CRYSTAL TESTING FACILITIES

  • Discussion about available facilities
  • IPN-Orsay: Transmittance (L&T, Ocean Optics fiber-based spectrometer with support structure, Varian Cary 5000), irradiation with source (Co-60, pointlike, 30Gy in 30 min), Light Yield with cosmics
  • Giessen Univ: Transmittance (L&T, Varian Cary 5000, reproducibility ~0.1%), Irradiation with source (Co-60, uniform, 30 Gy in 10 min, room temperature), Light Yield with source (temperature control to 0.1 deg)
  • CUA/CU: Transmittance (L&T, Perkin-Elmer Lambda 750, reproducibility ~0.2%), irradiation option with Xrays (Faxitron CP-160, energy range up to 160 kV), Light Yield with Na-22 source (temperature stabilization better than 1 degree)
  • Caltech: Transmittance (L&T, Perkin-Elmer Lambda 950, reproducibility ~0.2%), irradiation with source (Co-60 for 2-30 rad/hr, Cs-137 for ~7000 rad/hr - sources pointlike?), Light Yield with Cs-137 source (systematic uncertainty 1%)
  • JLab: Transmittance (L&T, integrating sphere, reproducibility few %), prototype tests (light monitoring and recovery, temperature controlled frame, energy resolution), fADC-based readout and triggering
  • Discussion about crystal selection and testing sequence at different institutions
  • Select a sample from 10+5 (2014) and from 30 (2015) crystals, then test at one institution, and send sample to the next institution
  • Discussion about using PbWO4 crystals at an EIC
  • Action item: GEMC of crystal matrix in EIC detector environment


CRYSTALS AT THE DIFFERENT INSTITUTIONS

  • IPN-Orsay has BTCP crystals for testing optical and irradiation setup. Ordered 3 CRYTUR crystals and expecting them in January 2016
  • CUA has BTCP crystals for testing optical and irradiation setup. Also has one 10-cm long CRYTUR crystal (from Rainer) and one 2x2x2 PbF2 cube from SICCAS (through VSL)
  • JLab has 11 SICCAS crystals from 2014 (9 are installed in the prototype, #1 and #4 are available for testing). Also has 30 SICCAS crystals from 2015, which have not yet been tested
  • Caltech has 2 crystals from the SICCAS 2014 set (#5 and #11). Plans to do proton irradiation tests at Los Alamos with crystal #11 over next few months
  • BNL has 2 crystals from the SICCAS 2014 set (#7 and #15). Plans to have these crystals tested at Caltech before returning


CRYSTAL TEST PLAN

  • Select subset of crystals from both 2014 and 2015 by next NPS meeting (December 2015)
  • Send crystals to one facility for testing
  • Once tests are done send crystals to the next facility. Need to check on logistics for sending crystals to Europe.


CRYSTALS AND EIC

  • Discussion about using PbWO4 crystals for the EIC endcap calorimeter and reconfiguring the NPS for that purpose
  • Action item: GEMC of crystal matrix (~1000 crystals of dimensions 2x2x20 cm^3) in EIC detector environment


NPS MAGNET

  • Discussion about two possible options for NPS magnet steel: parts of existing magnets, e.g., 45D45, or parts from the SBS counterweight
  • Additional steel for WACS experiments could be procured through UK funds
  • 3D magnet model has been sent to the designer


COLLABORATION MEETING: 21 JANUARY AT JLAB (time: TBD)

  • General agenda topics as discussed previously include:
  • existing thoughts to make the best optimal photon source needed for the approved polarized WACS experiment, but perhaps also beneficial for other already approved proposals
  • updates on the progress with crystal tests/selection procedures
  • update on magnet design
  • update on PMT HV divider
  • possibiliites for Timelike-Compton Scattering measurements with photon beam, NPS and polarized target in Hall C
  • ...


ITEMS FOR NEXT MEETING:

  • Background simulations
  • Plan for crystal testing 2015/16+
  • Update on magnet
  • Readout
  • NPS collaboration meeting planning
  • Other...


NEXT MEETING: THUR 10 DECEMBER, TIME: 9:00 AM (EST)