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 (horizonal and vertical in the spectrometer coordinate system) 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)