Ultraclean CCD project
Overview table
| Material | Washing | Vacuum baking (10-2 mBar) |
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| Possible solvent | Hand cleaning | 1. Ultrasonic bath with Tickopur detergent (temperature, duration) | 2. Ultrasonic bath with purewater 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 andstainless 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 tankalone | 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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