General Meeting Summary 2/21/19

NPS EXPERIMENT READINESS REVIEW

• Discussion about action items posted on Wiki

• HV divider: check for linearity at low voltages ongoing - focus on anode current
• Magnet: need plan for mapping and running, and safety documents, actual test may not be possible before ERR
• Trigger/electronics: need answer for how software chain handles data rates

• Discussion of ERR charge, agenda, presentations

• Safety documents: radiation budget submitted, need to edit COO (add RCs, etc.) ad ESAD (e.g. additional safety measured required for NPS)
• Agenda - confirm presentations on mechanical structure, electronics, beam line commissioning
• Planning: aim for a meeting in mid-April to go over rough structure of each talk (how many slides, content of slides); plan for a real dry run 1-2 weeks before the ERR

UPDATES

• Magnet (Bogdan)

• cooling, connections being worked on to get magnet ready for testing
• OSP: Charles agreed to write it
• additional safety measures implemented in light of recent magnet events

• Frame (Carlos)

• Mock-up constructed and tests of concept of accessing PMTs from back with boards on rails
• Got quartz fibers (1mm and 0.8mm diameters) to test radiation hardness - in general, fibers are very stiff (more than cables)

• Note that in the past glass fibers were only used for calibrations, e.g. 0.2mm diameter for PANDA, but for curing need larger diameter

• Carried out radiation resistance tests with Silicone cookies - they are radiation hard at high doses (30 Gy and >100 Gy)

• Crystals (Vladimir, Tanja)

• Received 18/55 crystals from CUA order - all pass initial inspection though mechanical quality slightly worse than previous 100 crystals from 2018
• Prototype data analysis ongoing
• Additional prototype data may be possible in next few days

• Simulation (Ho San)

• Nice plots of longitudinal shower profile with and without gaps - not significant difference at peak
• Impact of the gaps between crystals on resolution shown earlier - no significant impact as long as stay <~1mm
• For ERR plot of transverse shower profile might be good

• Mechanical design - update at next meeting

• Angle range of NPS remains at: 5.5 - 57 degrees, but small-to-large-angle changeover is now 23 degrees

NEXT MEETING: THURSDAY 7 MARCH AT 9:00 AM (ET)