Difference between revisions of "October 9, 2019 FCAL Insert Design Meeting"
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* Discussed Tungsten absorber | * Discussed Tungsten absorber | ||
** No decision on coverage, still at 1.5 crystals | ** No decision on coverage, still at 1.5 crystals | ||
| + | * Monitoring System | ||
| + | ** Need to order diamond end mill - Tim | ||
| + | ** 1mm fibers for test | ||
| + | ** 2 Test samples made, 15cm square with 6mm 45 degree bevel | ||
| + | * Cooling of blocks - 2.1 KW needed | ||
| + | ** Inner cooling ring move to be in line with outer to keep area behind lead-glass module clear for repairs | ||
== Action items == | == Action items == | ||
Revision as of 13:33, 23 October 2019
Meeting Time and Place =
Wednesday Oct, 9 2:00 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_25,_2019_FCAL_Insert_Design_Meeting
- Discuss Tungsten absorber
- Cover 1.5 crystals ok?
- Rohacell supported
- Monitoring System
- Use 1/2" Acrylic sheet with 45 degree angles on edges
- Testing plan
- 1mm fibers
- 15cm square with 6mm 45 degree bevel
- 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 - needs to clear for FCAL module removal
- 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
- Discussed Tungsten absorber
- No decision on coverage, still at 1.5 crystals
- Monitoring System
- Need to order diamond end mill - Tim
- 1mm fibers for test
- 2 Test samples made, 15cm square with 6mm 45 degree bevel
- Cooling of blocks - 2.1 KW needed
- Inner cooling ring move to be in line with outer to keep area behind lead-glass module clear for repairs
