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Ultraclean CCD project
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Treatment of cryostat components

Overview table

Material Washing Vacuum baking
(10-2 mBar)
Possible solvent Hand cleaning 1. Ultrasonic bath with Tickopur detergent (temperature, duration) 2. Ultrasonic bath with pure water or non-ultrasonic bath with solvent (temperature, duration) Maximum temperature Minimum duration
Fiberglass (modified Epoxy material) Acetone no 85 oC, 30 min. 35 oC, 30 min. 120 oC 16 h
Metals (Aluminium parts and stainless steel) Acetone yes 85 oC, 30 min. 35 oC, 30 min. 180 oC 16 h
Electronic boards ZIF-sockets Alcohol no 85 oC, 30 min. 35 oC, 30 min. 150 oC 72 h
Raw boards Alcohol no 85 oC, 30 min. 35 oC, 30 min. 120 oC 72 h
Soldered boards Alcohol yes no no 85 oC 72 h
CCDs EEV no no no no 80 oC 72 h
Tektronix no no no no 55 oC 72 h
MIT / LL no no no no 60 oC 72 h
Vacuum connectors Alcohol no 85 oC, 30 min. 35 oC, 30 min. 85 oC 16 h
Welded inner tank Acetone yes 85 oC, 30 min. 35 oC, 30 min. 85 oC 72 h
CFC inner tank structure Alcohol yes 85 oC, 30 min. 35 oC, 30 min. 85 oC 72 h
Painted shields no
(alcohol, only for areas without paint)		 no no no 120 oC 72 h
Glued components Alcohol yes no no 120 oC 72 h
VITON O-rings Alcohol yes 85 oC, 30 min. 35 oC, 30 min. 120 oC 16 h
Zeolite (sorption pump) Store in dry atmosphere no - - 180 - 350 oC 16 h
Active charcoal Alcohol is possible no - - 100 oC 16 h
Vacuum pipes Acetone yes 85 oC, 30 min. 35 oC, 30 min. 180 oC 16 h
Pumps Vacuum valve Alcohol yes - - 120 oC 16 h
Vacuum gauge Alcohol yes - - 85 oC 16 h

Cryostat integration and final tests

Click here for the   Overview of all steps as summary.

Step Tools Hints
1 Integration of parts Gloves Clean room class 100
2 All O-rings with grease without gloves Clean room class 100
3 Pumping only oil free pumps to 10-2 mBar  
4 Leak test Leak tester  
5 Baking of sorption pumps and cold plate in tank alone Vacuum pump Cold plate + 40 °C,
sorption pump 80 - 200 °C
6 Assembly of ready cryostat head with tank Gloves Sorption pump and cold plate remains hot;
clean room class 100
7 Leak test Leak tester  
8 Baking sorption pump and cold plate Vacuum pump  
9 Cool down test Liquid nitrogen Pumping during cooling down with cold-trap

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Last update: Mar 24, 2004
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