SOME NEW TECHNIQUES IN ULTRA-HIGH VACUUM

Technical Report · Mon Aug 12 04:00:00 EDT 1963

OSTI ID:4633327

Batzer, T H; Ryan, J F

Simple, reliable metal gaskets of aluminum foil have led to several new techniques. These seals permit prolonged temperature excursions from liquid- nitrogen temperature to 450 deg C. Using foil seals, the outgassing characteristics of a 50-liter aluminum alloy vessel were investigated. The vessel was baked to 240 deg C. The gas composition and evolution rate was determined with and without a molybdenum getter-trap in series with the liquid- nitrogen trap. The trap, getter, and valve were separately baked to 400 deg C. The complete absence of pressure fluctuations typical of diffusion pumped systems in the range of 10/sup -10/ Torr is credited to a special zeolite backing pump which eliminated mechanical-pump contamination by doubling as a trap during roughing. (auth)

• Research Organization: California. Univ., Livermore. Lawrence Radiation Lab.
• DOE Contract Number: W-7405-ENG-48
• NSA Number: NSA-17-039222
• OSTI ID: 4633327
• Report Number(s): UCRL-7393; CONF-209-2
• Country of Publication: United States
• Language: English

Related Subjects

ALUMINUM
ALUMINUM ALLOYS
DEGASSING
DIFFUSION
ENGINEERING AND EQUIPMENT
FOILS
GASES
HIGH TEMPERATURE
IMPURITIES
ION EXCHANGE MATERIALS
LOW TEMPERATURE
METALS
MINERALS
MOLYBDENUM
PRESSURE
PUMPS
QUALITATIVE ANALYSIS
SEALS
TEMPERATURE
TRAPS
VACUUM
VALVES
VARIATIONS
VESSELS
ZEOLITES