General Meeting Summary 1/25/24

Participants: Alexandre, Bogdan, Deb, Ed, Hamlet, Jasper, Josh, Steven L., Mark, Paulo, Tanja, Aaron Brown, Marie, Yeran, Yaopeng Zhang, Rolf, Carlos, Julie, Vardan, Christine, David H., Mark Mathison, Hao Huang,

NPS DEINSTALLATION DISCUSSION

NPS APPROVED SCIENCE PROGRAM AND FUTURE USE OF NPS

• Next time use of NPS?

• no sooner than 4-5 years from now

• There is an approved NPS science program, several LOIs, and new ideas to be submitted to PAC. There are experiments that use:

• (5 approved experiments) NPS at small angles using SHMS as carriage (run group 1a and 1b) and HMS
• (2 approved experiments) NPS at large angles using SHMS as carriage (on the other side to run group 1a) and HMS
• (1 approved experiment) NPS at large angles and the Compact Photon Source
• (1 approved experiment) NPS reconfigured as part of an ECAL+HCAL system downstream from the target
• (1 conditionally approved experiment) NPS + positrons
• currently 2 LOIs and 1 experiment being developed for NPS/NPS+CPS

• When to run Compton Scattering unpolarized with NPS and SHMS/HMS?

• Note this is an approved experiment that requires the NPS (but NOT the CPS)
• Needs further discussion

• Action: make a plan for the next time using the NPS

• meet with Mark and others to discuss about scheduling which of NPS run groups to run first
• ordering is important as some experiments need NPS in its present configuration and some need reconfiguration
• different configurations need different considerations

NPS DEINSTALLATION CONSIDERATIONS

• De-cabling between 5/20 and 6/3 at JLab

• students if possible
• special training needed?
• read EPAS and sign document
• Plan on what cables need to be dismounted first etc.
• usually damage happens to connectors - try to connect cable ends (plastic foam and bag around it and put ties)

• Cables from patch to SHMS - permanent, will stay

• HV cables will come out
• LED cables come out

NPS STORAGE CONSIDERATIONS

• Near term plan: Keep all items together, do proper labeling

• need to have capability to test detector in the storage location or in another designated location
• no work planned over the next year for NPS - so can store

• What access is needed to NPS starting from approximately one year from now (estimate) - needs to be figured out so that can decide if anything needs to be modified

• Do we have procedures for installing NPS for future reference

• example: pay attention to rails - detector moves smoothly on them - should install like that again
• have pictures, have movies, but presently no written documentation
• have a plan and that was followed
• Action: make (rough) documentation for installing NPS

• NPS components storage plans and requirements - Walter's team plans to store the detector in ESB in roped off(?) area

• detector and framework (and side shielding?)
• cables, cable trays,
• magnets - flush lines, etc.
• rails - must be treated, coated to not rust, should be inside
• platform - can be outside, must be painted with anti-rust liquids (storage details not yet in schedule - assumed to get done after deinstallation)
• beam line? - store in physics storage building (storage details need to add to schedule)

• Cooling system in detector

• purge it, keep anti-freeze in
• make maintenance plan - flush out every year
• same with air handling system

• Actions and near term plan:
• make a site map to keep track of NPS components; plan for annual inspection of the NPS components
• make maintenance plan for some of the NPS components, e.g., cooling system and air handling system
• store equipment, mark and label everthing
• document procedures
• make a plan for the next time using the NPS - start with

JLAB OPEN HOUSE AND NPS

• Figure out how NPS should look like for JLab Open House on June 8th, 2024

NEXT MEETING: 22 FEBRUARY 2024 AT 9AM ET