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LN2 internally cooled M1 prototype (test prep (design and build mounting…
LN2 internally cooled M1 prototype
related systems
carbon cleaning
vacuum
compton shielding
stand (floor to alignment stage)
main questions to be answered by prototype
validate finite element calculations
measure and minimize vibration
demonstrate reliability
people
Allézy
Bryant
Smith
Cutler
prototype tests
leak test mechanical seals
leak test bonded seals (from SIRIUS)
measure cool down deformation, heat off
measure deformation, heat on
measure vibration with water in air, heat off
measure vibration with LN2 in vacuum, heat off
measure vibration with LN2 in vacuum, heat on
test prep
design and build mounting and alignment system ($10k, 8 weeks)
design and build leak test apparatus ($10k, 4 weeks)
establish baseline vibration level with current water internally cooled dummy mirror (4 weeks)
design and build deformation test apparatus ($20k, 8 weeks)
adapt vibration measurement apparatus for LN2 ($2k, 4 weeks)
design and fabricate mirror prototype ($15k, 8 weeks)
acquire / borrow LN2 chiller ($260k)
design and build chiller to mirror plumbing ($2k, 4 weeks)
long term lease / buy smaract ($50k )
design thermal control system for varying heat loads (6 weeks)
cost: $109k parts only (w/o chiller or people's time)
schedule: 46 weeks (depending on availability of people)