General Meeting Summary 2/20/20

DISCUSSION 2020 NPS TO-DO LIST

MECHANICAL DESIGN

• Action item: Send updates on kinematics (DVCS) to the Hall C design team

• mainly need NPS angle, distances, and HMS angle to check for interference
• consolidate everything into one table

• Action item: Add a bullet with beamline specific items (this task would start after May 2020)

• vacuum
• corrector
• need to have design and mounting concept

• Crane operation smooth enough for NPS?

• the abrupt stop/start has been a problem for aerogel tray (de)installations and optimizations have been ongoing

MAGNET

• For bullet 2: generate documentation - helpful to see what has been done already and also needed for experiment and safety documentation

• For fringe field vs. current main interest is the effect on the beamline

• impact on physics was discussed at the 2/3 collaboration meeting

FRAME

• Tasks, e.g. quotes, ongoing

• Possible concept for insulation from mu metal (avoid electrical contact with PMT and crystal): instead of insulating material, e.g. kapton or teflon wrapping all tubes (labor intensive and labor is limited), retract the mu metal cylinder from the PMT front face

• can show concept in more detail at next meeting

• Preshaping

• Wrapping material will be shipped to JLab
• A relatively large oven (with max temp ~300degC) is available from Bogdan - how long is it needed?
• Action item: prepare drawings of the needed additional shaping tools for parallel production of pre-shaped wrappers
• Action item: prepare documentation for using the oven

CRYSTALS/GLASS

• Working on paperwork to ship 10 CRYTUR crystals (and also connectors) to Orsay; planning to ship glass in May

• For bullet 3: plan to check with Crytur in May/June on expedited delivery schedule

• Follow up on location of the most recently shipped 10 Crytur crystals - have they arrived at JLab?

HV DIVIDERS

• Calculations from 2/3 collaboration meeting showed a very high anode current (kinematics dependent)for NPS experiments

• Hall D has made measurements of the anode current, but the configuration is different from NPS

• A measurement of the anode current in NPS conditions in Hall C is not feasible

• To verify the NPS calculations, can:

• compare calculation for Hall D configuration with Hall D measured anode current results
• make a measurement of the anode current with LEDs prepared for expected NPS condition - has this been done already by Fernando?

DAQ AND ELECTRONICS

• Tasks are ongoing

• Bullet 8 - confirm with DSG the development of slow control SW has been completed

SIMULATION AND SOFTWARE DEVELOPMENT

• Tasks are ongoing

NPS SCIENCE: TCS

• Postponed to CPS meeting. However, slides are posted and comments welcome

NEXT MEETING: THURSDAY 26 MARCH AT 9:00AM (ET)