September 25, 2019 FCAL Insert Design Meeting
From GlueXWiki
Meeting Time and Place
Wednesday Sept 25 1:30 pm At Jefferson Lab, room TED 2504
- Present - Sasha Somov, Josh Crafts, Eugene, Stephanie, Keith Harding, Tim, Fernando, Chris Stanislav
Agenda
- Action items from last meeting https://halldweb.jlab.org/wiki/index.php/September_9,_2019_FCAL_Insert_Design_Meeting#Agenda
- Discuss Center tube
- 1mm thick wall minimum. ID is 3.8 cm
- Upstream end flush with upstream face of acrylic
- Discuss Tungsten absorber
- Cover 1.5 crystals ok?
- Rohacell supported
- Monitoring System
- Use 1/2" Acrylic sheet with 45 degree angles on edges
- How to attach fibers? Media:Acrylic_sheet.pdf
- What size fibers?
- Ok to make test piece as shown?
- Cooling of blocks - 2.1 KW needed
- 2 Chillers like those used for BCAL ($16K ea)
- 4 water to air Heat exchangers around crystal area
- 9 parallel circuits for each chiller
- potted copper tube into aluminum blocks
- Cooling of inner tube - removable plate
- Proposed manifold similar to BCAL
- Support structure and assy sequence
- electronics patch panels DS of crystal pmts
- Discussed Brazing of PMT module straps and new mag field tests
- Sasha wishes to assemble a new 9 module array for magnetic field testing
- 18mm diameter light guides are needed - josh found some on Amazon - tim will order
- 6mm longer with 50 micron larger ID mag shield steel needed - Submitted to machine shop Media:1020_shield.pdf
- additional mu metal shields needed (same as previous - 350 microns) - Tim ordered Due Oct 18-
- Have steel shields annealed - Tim looking into it >900C
- Sasha wishes to assemble a new 9 module array for magnetic field testing
- Discuss test fixture for PMTs in beam
- Need to fabricate steel case - Media:Steel_shield.pdf
- need to fabricate support structure - Tim
- Need to fabricate feedthru panel - Josh/Tim
- need to fabricated aluminum base plate - Josh/Tim
Minutes and Action Items
- Inner Tube
- ok to use 2mm wall
- Acrylic Monitoring sheet
- make 1/2" thick with 6mm bevel on outer edges only
- Drill holes with diamond end mill for polished bottom
- 1mm fiber probably ok
- look at putting a rubber gasket on end flange of modules to prevent cross talk
- make test piece Determine size to fit in dark box
- Cooling Manifold
- Need to make sure there is room to replace FCAL module electronics
- Need humidity control in dark room
- Electronics Patch Panels
- Fernando informed us that a 48 wire cable will be used for HV
- HV cables carries 48 individual wires, large bend radius Media:Radiall_connector.pdf
- PCB mounted connector to bring power from Radiall to individual bases Media:SamtekHV.pdf
- still need 1600 signal connectors on patch panel using same connectors as ComCal
- Layout separate HV and signal patch panels - Keith
- Develop Installation/Assembly sequence for detector - Keith