General Meeting Summary 9/12/13

BUDGETARY QUOTES AND MRI PREPARATION

• PbWO4 quotes from three different vendors (Crytur, Kinheng, SICCAS) received so far range between $1000 and $3000 per crystal, which is a factor of at least 4 higher than what was assumed in the cost estimation for FCAL-II we used for original estimations

• Best estimate based on available quotes may be $1,000-$1,500 per crystal

• Some discussion on path forward

• Combine efforts on PbWO4 with other labs/experiments

• PANDA is considering PbWO4 for the EM calorimeter of the target spectrometer. It would be interesting to learn more about their vendor experience.
• BNL may also be considering PbWO4 for new detectors or upgrades. It would be good to learn more about the details, e.g., requirements, vendor experience, time scale.
• CMS is replacing their forward PbWO4 calorimeter. It would be interesting to learn about the timescale of this replacement

• Use PbF2 from DVCS/HA to fill outer region of NPS reducing total number of PbWO4 crystals needed

• About 200 PbF2 crystals of dimension 3cm x 3cm exist

• Explore funding options in Europe

• Orsay funds may be available on timescale two years
• Possibly request funding in a combined proposal France/UK/Italy to European funding opportunity

• Explore additional vendor options in, e.g., Russia and Japan

• TH communicated with Tohuku group about contact information
• Julie/Rolf/Hamlet may have additional contacts in Japan and/or Russia

• Once best estimate confirmed, contact NSF to discuss best option for MRI. MRI deadline is 23 January 2014

• Overview on crystals and rough estimate of NPS PbWO4 requirements:

• Overview crystal requirements (PANDA/CMS/NPS) and comparison to LSO/LYSO
• Analysis of PbWO4 properties and definition of NPS requirements (Hamlet)

• Choice of PMTs

• PMTs from Primex (Hamamatsu R4125, 19mm diameter, gain about 8.7E+5 at 1.5kV max. anode voltage and rise time 2.5ns) work for NPS. Note that we have designed a new active voltage divider that improves the performance of the PMT compared to the performance in PrimEx by a factor of 25.
• Ask quotation from Hamamatsu on this PMT and/or any with similar characteristics

• Some discussion about LSO/LYSO crystals as alternative to PbWO4

• Crystals are under study for next generation HEP experiments
• Pricing seems to be $3,000/crystal
• Caltech group is working with LSO/LYSO for PANDA detectors. It would be interesting to learn more about this.

NPS COLLABORATION MEETING: THURSDAY 14 NOVEMBER

• Best day is Thursday, 14 November. Location will be JLab

• It would be good to start planning out the agenda by our next meeting in October. Some initial ideas on topics are discussed:

• Theory discussion on physics interpretation of RCS (C. Weiss, P. Kroll, other, ...)
• Discussion on plans for submission for pi0 photoproduction proposal (Dipangkar, other...)
• Update from Designer on NPS design (M. Fowler, other ...)
• Discussion on electronics (Fast electronics group)
• Update on HC plans/status

ITEMS FOR NEXT MEETING:

• Budgetary quotes for PbWO4 and PMTs (PbWO4: Hamlet, Julie, Rolf, TH; PMTs: Charles)

• Updates from other facilities and their experience and plans for PbWO4 purchases (Carlos, Rolf)

• Continue discussion of NPS project funding strategies

• Agenda for next collaboration meeting

NEXT MEETING: THUR, 3 OCTOBER at 9AM (EDT)