Difference between revisions of "September 9, 2019 FCAL Insert Design Meeting"
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* Discussed Monitoring system | * Discussed Monitoring system | ||
** Use 1/2" acrylic sheet same as FCAL | ** Use 1/2" acrylic sheet same as FCAL | ||
| + | ** Discussed possibility of pre-assembling the acrylic, fibers and rohacell | ||
| + | ** Layout fibers coming through rohacell and cut angles on acrylic - Keith/Tim | ||
| + | ** Fabricate a test piece - Tim/Keith/Josh | ||
== Action items == | == Action items == | ||
Revision as of 16:03, 10 September 2019
Meeting Time and Place
Monday Sept 9 2pm At Jefferson Lab, room TED 2504
- Present - Sasha Somov, Josh Crafts, Vlad, Eugene, Stephanie, Keith Harding, Tim
Agenda
- Discuss 40x40 crystal assembly with 19 Lead glass modules around
- Crystals move to 12.5 cm from US face of lead glass
- 40x40 crystal matrix starts with shim to be able to go to 32x32 fairly easy.
- Decision to pre-measure stacks of crystals and the existing FCAL to determine bottom row offsets
- Discuss installing Rohacel US of crystals to fill hole and support the lead glass blocks
- Rohacel properties Media:Rohacel cut sheet.pdf
- Radiation Hardness https://p25ext.lanl.gov/phenix/mvd/notes/1997/PHENIX-MVD-97-5/radiation.html
- http://www.phenix.bnl.gov/WWW/publish/bosze/phenixnote272/radiation.html (same data)
- Discuss Tungsten absorber
- Cover 1.5 crystals ok?
- Rohacell supported
- Monitoring System
- Use Acrylic sheet, how thick?
- How to attach fibers?
- 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 - removeable plate
- electronics patch panels DS of crystal pmts
- Brass strap soldering progress
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
- Layout fibers coming through rohacell and cut angles on acrylic - Keith/Tim
- Fabricate a test piece - Tim/Keith/Josh
