Difference between revisions of "September 25, 2019 FCAL Insert Design Meeting"
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== Meeting Time and Place == | == Meeting Time and Place == | ||
− | Wednesday Sept | + | Wednesday Sept 25 1:30 pm |
At Jefferson Lab, room TED 2504 | At Jefferson Lab, room TED 2504 | ||
Revision as of 09:06, 25 September 2019
Meeting Time and Place
Wednesday Sept 25 1:30 pm At Jefferson Lab, room TED 2504
- Present - Sasha Somov, Josh Crafts, Vlad, Eugene, Stephanie, Keith Harding, Tim
Agenda
- Discuss Center tube
- 1mm thick wall minimum. ID is 1.8 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
- 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 -
- 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 the center support tube
- Need to determine material for center tube - Sasha
- consider magnetic properties, thermal conductivity, strength, stiffness
- Need to determine the maximum hole size allowable (assume steel initially) - Tim
- Need to move the upstream end flush with US side of acrylic sheet - Keith
- Need to decide on size of hole (2x2 crystals now) - Sasha
- Need to determine material for center tube - Sasha
- Discussed Monitoring system
- Use 1/2" acrylic sheet same as FCAL
- Discussed possibility of pre-assembling the acrylic, fibers and rohacell
- Determine diameter of fibers - Sasha
- Layout fibers coming through rohacell and cut angles on acrylic - Keith/Tim
- Add fibers to inner hole edge
- Fabricate a test piece - Tim/Keith/Josh
- Discussed feedthru panels attached to cable support chains
- Cables are stiff, ok to attach panels to cables with hinge
- Use ComCal feedthu sizing to develop panels - Keith
- Cables should be strain relived to chains
- Discussed cooling system
- Concept to glue copper tubes to aluminum blocks with thermally conductive epoxy accepted
- Concept to clamp cooling plates to inner support tube accepted
- Assuming 2.1KW total heat load, we would need 2 of the chillers used for BCAL.
- Continue with connections and manifold layou - Keith/Tim
- Discussed Brazing of PMT module straps and new mag field tests
- Josh has successfully brazed and cleaned (warm water) an assembly and is testing
- Test with 2mm cookie to ensure enough pressure can be maintained for good transmission - Josh
- Sasha wishes to assemble a new 9 module array for magnetic field testing
- 18mm diameter light guides are needed - Tim
- 6mm longer with 50 micron larger ID mag shield steel needed - Tim
- additional mu metal shields needed (same as previous - 350 microns) - Tim
- Have steel shields annealed - Tim
- Discussed test fixutre for PMTs in beam
- Need to fabricate steel case - Tim
- need to fabricate support structure - Tim
- Need to fabricate feedthru panel - Josh/Tim
- need to fabricated aluminum base plate - Josh/Tim