Commissioning the IR Cryostat
Concept study:
final
drawing .
Fabrication:
photo galleries:
cold
screen (+small pieces), warm
vessel (), parts(Moly,
Ni-plating,
), electrical (pcbs,
flex, sensors, heater, , )
Reception, Assembly and
Tests:
- factory tests: Méca 2000 report (??)
- reception and test procedure, assembly scenario 1st
doc(french)
- fiche de suivi montage suivi
Août (.pdf), suivi janvier
2005,
- vacuum test (report TBD): excellent (P<10-7
with cryopumping). Permanent LabView monitoring has found a
non-conformity of Alcatel
ACC1009 gauge (originated in bad factory adjustment of Pirani).
Adjustment done.
- cryogenic test (report TBD):
- LN2 consumption 2.5 l/hour dominated by losses in Dewar and
transfer
line. Fast cooling needs 1 l/hour, 140K
operation 0.2 l/hour
- thermal screen T stable, range 85-293K, permanent monitoring
of 6 points -too much- (e.g. cooling,
145K
fixed, slow, fast
warmup)
- focal plane electronics T stable, range 125-293K, permanently monitored
- cryotiger head T=65K with cold screen
- electrical test (report TBD): done
with cold
clamp&sample ASIC FPE+DSA+floating PC. Noise <1µV with
vacuum pump and Pt100
monitoring on.
- Molybdenum plate
passed reception tests including 1RG-baremux mount
, cryostat
mount and LN2+cryogenerator cooling.
Non-conformities:
- Two month factory delay for the fabrication of the molybdenum
plate supporting the detector. This delay has been used for an upgrade
of the thermal screen (Ni coating + inner black paint).
- The new LN2 transfer line arrived 2 month late just to discover a
wrong
diameter in the cryostat LN2 inlet. Has been fixed at factory. Action:
CCD and IR Dewars were made exchangeable.
Final thermal test has been done in early january
Etienne Barrelet Last
modified: March 13, 2005
