ATTAINMENT OF 10$sup -9$ mm Hg PRESSURE IN UNBAKED VACUUM SYSTEMS BY MOLYBDENUM EVAPORATION
Technical Report
·
OSTI ID:4136103
The deposition of molybdenum by vaporization from simple hairpin filaments was found to reduce the pressure in an unbaked, stainless steel vacuura system to 4 x 10/sup -10/ mm Hg. The deposit of 300 milligrams from a single filament 0.050 inch in diameter and about 6 inches long, has maintained an 85- liter volume at a pressure below 10/sup -9/ mm Hg for a period of over 40 hours. A small, well-trapped diffusion pump is attached to the system to attain the initial pressure of 10/sup -7/ mm Hg and to pump the ungettered components which are presuraably responsible for the ultimate pressure in the system. The geometrical area of the molybdenum substrate was 8 x 10/sup 3/ cm/sup 2/. The initial pumping speed of this deposit was 4 x 10/sup 4/ liters per second for hydrogen. (auth)
- Research Organization:
- California. Univ., Livermore. Lawrence Radiation Lab
- DOE Contract Number:
- W-7405-ENG-48
- NSA Number:
- NSA-14-016744
- OSTI ID:
- 4136103
- Report Number(s):
- UCRL-5889
- Country of Publication:
- United States
- Language:
- English
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