D-Zero Collider Detector CC Initial Vacuum Pumping Preparation and Procedure
The initial vacuum pumping of the fully loaded cryostats immediately upon completing the minimum head welding necessary for the cryostat vacuum loading is important to (1) water removal, (2) high vapor pressure (micron level) outgassing, (3) helium mass spectrometer leak checking sensitivity, and (4) a less well understood concern for LAr background contamination. The CC pumping preparation and procedure that has been utilized is recorded here. Recommendations are incorporated in italics and in context to improve the EC vacuum preparations and pumping performance. The estimated pumping loads of large assemblies of (G10) water laden modules are calculated in EN 270. The predicted and experienced water pumping period was ca. 45 days. The cryopump specifically designed to serve this purpose is described in EN 291. These notes are recommended background reading for this work.
- Research Organization:
- Fermi National Accelerator Laboratory (FNAL), Batavia, IL
- Sponsoring Organization:
- DOE Office of Science
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1031808
- Report Number(s):
- FERMILAB-D0-EN-290
- Country of Publication:
- United States
- Language:
- English
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