A LIQUID-HELIUM-COOLED TRAP FOR PUMPING GAS BY ADSORPTION
Technical Report
·
OSTI ID:4117576
An apparatus was tested in which two vacuum chambers are connected by a cylindrical hole (2.54 cm in diameter and 50.8 cm long) formed in degassed charcoal that is cooled to the temperature of liquid helium. Portions of the two vacuum chambers are also at or near to liquid-helium temperature. When a hydrogen leak into one chamber was turned on at a rate (0.5 mu l/sec), which resulted in a steady pressure of about 5 x 10/sup -6/ mm Hg, the pressure in the chamber connected to the opposite end of the tube did not rise significantly above the base pressure ( approximately l.5 x 10/sup -8/ mm Hg) for 75 minutes. When the leak rate was increased by a factor of nine, the time delay before the pressure rise was decreased by a factor of about nine. No delay was observed when the charcoal was at liquid-nitrogen temperature. (auth)
- Research Organization:
- California. Univ., Livermore. Lawrence Radiation Lab.
- DOE Contract Number:
- W-7405-ENG-48
- NSA Number:
- NSA-15-007451
- OSTI ID:
- 4117576
- Report Number(s):
- UCRL-6113
- Country of Publication:
- United States
- Language:
- English
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