General Meeting Summary 4/14/22

PARTICIPANTS: Aaron Brown, Alexandre Camsonne, Charles Hyde, Arshak Asaturyan, Fernando Barbosa, Carlos Munoz-Camacho, Tanja Horn, Rolf Ent, Abishek Karki, Brad Sawatzky, Erik Wrighton, Hamlet Mkrtchyan, Steven Lassiter, Marie Boer, Vladimir Berdnikov, Paulo Medeiros

HV DIVIDERS

• received ten first articles - tested - matched the reference

• proceeded with production - some delays with Samtex connectors, but resolved now

• in process of assembling - ~20% complete - expect to the on schedule

FRAME TEMPERATURE AND HUMIDITY SENSORS

• DSG provided model - each sensor requires 4 slots in the keysight terminal block

• Determine if enough space for cables etc. inside the enclosure

• 24 (12x2) slots available in front 2 blocks

• instead of placing humidity sensors inside on the frame attach them on the panel at front

• at back no issue - enough space - need long cables though

• Need to purchase: sensors, boards, cables

• Action item: send drawings and any other information to Aaron

• Also needed: modification of the top plate/panel

• Brad can coordinate

UPDATES FROM DSG

• EPICS HV Controls

• Impact of cooling shell (10 degC) - thermal analysis with no continous heat load (at ambient temperature) - 210 crystals in central zone hottest (between 19.0 and 20.5 degC)

• concentrated at back - impacts only tail of shower
• need to review longitudinal heat map
• any impact on resolution?

• still need to include cooling at back

• assume 0.5 W/channel,

• Carbon fiber thermal conductivity

• .5523w/m*degc
• back mu metal has higher conductivity (19 W/m*K)

• Is there an option to turn on/off HV row by row (or column by column)

• working on turning off all channels for one module

• Air flow at back of the crystals, no flow at front part of crystal

• Model air as fluid? - not yet

• Action items

• collect all information in repository
• evaluate if the material could be published in a journal

MECHANICAL/ENGINEERING

• NPS deck has been installed almost completely

• Stairs in place - needs to be mounted

• Note: it's a temporary fitting - needs to be taken off again for rotation to reach 5 deg angle in PionLT

INSTALLATION SCHEDULE

• Revisited to assist with scheduling the next experiments in Hall C

• 41 days from beam off (1 March 2023) until all support structures ready (HB removal, take down beam line, platform install and fitting, cable tray layout, cable connections, etc.) - total is ~2-3 months

• Roof block - presently consider modifying existing roof block

• Mechanically can be ready by 1 May 2023 - assume until 29 May 2023 for cable hookup and checkout

• Experiment schedule - will NPS experiment be scheduled or need to go for Jeopardy

ASSEMBLY PREPARATIONS

• Assembly space - on track to be available at end of April

• Shelving - request was put in, but not yet available - alternatives available

• Action item:

• Brad and Vladimir will further discuss offline

• Onsite personnel - in particular for May as this is where crystal wrapping has to be completed before the IJCLab-Orsay team arrives for stacking

• for wrapping ideally need two shifts of ~4 hours each per day with each shift 2-3 people
• so far the following teams have indicated availability: AANL (2), CUA (2-3), DSG (1-2 at the end of May only)
• close, but still room for additional collaborators - will follow up by email
• Action items:

• collect number of collaborators on site in May
• organize a shift schedule for the crystal wrapping

• Safety documents preparation - Brad will check

• DAQ/Electronics and Analyzer

• moving forward
• meeting every 1-2 weeks organized by David Hamilton

NEXT MEETING: THURSDAY MAY 12 AT 9:00AM ET