General Meeting Summary 3/22/17

JLAB DETECTORS

• Discussion about SHMS Aerogel Cherenkov detector (Arthur, Hamlet, Vardan)

• Position dependence data from KPP runs have been analyzed. Results (horizontal and vertical in the spectrometer coordinate system, where X is pointing down and Y beam right) show negligible dependence on vertical position (note and no dependence on horizontal position
• Discussion about getting SP-11 tray ready

• Walter's group is constructing the cover plate
• Next steps: 1) install last layer of SP-11 aerogel tiles and support, 2) install wires, 3) install tray in SHMS and perform cosmics tests

• PMT cabling optimization to be done before next hall closing in Fall

• for possible options keep in mind that cannot have negative impact on tray exchanges/sliding out detector from detector stack and work on other detectors near aerogel

• NPS prototype (Arthur, Hamlet)

• Linearity tests of HV dividers have been completed with single crystal prototype - results show that stable up to 1-2 MHz consistent with design specs
• Discussion about tests of NPS cooling systems with 3x3 prototype - idea is to use a closed-circuit design, need to get a suitable chiller

• Gluex DIRC (Greg)

• Discussion about transportation of DIRC bars from Stanford Linear Accelerator to JLab

• bars will be in a crate and transported by truck, monitoring cameras will be installed for all twelve bars, reference spectra will be monitored during transportation, lead vehicle to warn about uneven roads
• discussion about adding a trailing vehicle to address rear-ending

PIXEL DETECTORS (Rachel)

• Discussion about shipment to CUA

• on schedule to arrive on 3/24
• discussion about procurement of an optical table for gantry

• Discussion about detectors at CERN

• good progress - sealed, dry, cooled - calibration data have been taken in control room

PBWO4 STUDIES AT CUA (Richard, Andres)

• working on assembly of the prototype, e.g. cutting aluminum to size, drilling holes etc (Richard)
• working on attentuator circuit to reduce reflections in APD readout (Andres)

TIMELIKE COMPTON SCATTERING (Vardan, Arthur, Pawel)

• Work on preliminary projections and comparison to already approved experiments ongoing

• Proposal deadline is 22 May, but also need to circulate to NPS collaboration

• Decision on whether or not to move forward with PAC proposal this year will depend on outcome of preliminary projections

NEXT MEETING: WED. 29 March at 10:00 AM (EDT)