METHOD FOR PUMPING GASES AT LOW VACUUM PRESSURES
Abstract
A method is given for pumping overpressure "pulses" or "bursts" of gases without a significant rise in base pressure within a "gettering-type" vacuum pump having surfaces within the pumping cavity coated with or comprising clean gettering metal, e.g., Mo or Ta. The cavity is first pumped down by any convenient means to an equilibrium base pressure in the range desired, generally below 10/sup -6/ mm Hg. At this pressure, the metal immediately adsorbs overpressures or "bursts" of gases striking same with thermal motion without raising the base pressure significantiy. Desorption takes place at an equilibrium rate which, of course, is dependent upon the equilibrium pressure, and such desorbed gases are continuously removed by diffuaion pump or other pumping, whereby said overpressures or "bursts" of gases are removed without a rise in the equilibrium pressure and/or back diffusion of the gaseous pulse from the pumping cavity. (AEC)
- Inventors:
- Issue Date:
- Research Org.:
- Originating Research Org. not identified
- OSTI Identifier:
- 4830542
- Patent Number(s):
- 3037685
- Assignee:
- U.S. Atomic Energy Commission
- Patent Classifications (CPCs):
-
H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01J - ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- NSA Number:
- NSA-16-019031
- Resource Type:
- Patent
- Resource Relation:
- Other Information: Orig. Receipt Date: 31-DEC-62
- Country of Publication:
- United States
- Language:
- English
- Subject:
- ENGINEERING AND EQUIPMENT; COATING; COOLING; FUEL CANS; FUEL ELEMENTS; GASES; JOINTS; MOLYBDENUM; PIPES; PRESSURE; PULSES; PUMPS; REACTORS; SEALS; SHOCK WAVES; TANTALUM; TEMPERATURE; VACUUM; VALVES
Citation Formats
Milleron, N. METHOD FOR PUMPING GASES AT LOW VACUUM PRESSURES. United States: N. p., 1962.
Web.
Milleron, N. METHOD FOR PUMPING GASES AT LOW VACUUM PRESSURES. United States.
Milleron, N. Fri .
"METHOD FOR PUMPING GASES AT LOW VACUUM PRESSURES". United States.
@article{osti_4830542,
title = {METHOD FOR PUMPING GASES AT LOW VACUUM PRESSURES},
author = {Milleron, N},
abstractNote = {A method is given for pumping overpressure "pulses" or "bursts" of gases without a significant rise in base pressure within a "gettering-type" vacuum pump having surfaces within the pumping cavity coated with or comprising clean gettering metal, e.g., Mo or Ta. The cavity is first pumped down by any convenient means to an equilibrium base pressure in the range desired, generally below 10/sup -6/ mm Hg. At this pressure, the metal immediately adsorbs overpressures or "bursts" of gases striking same with thermal motion without raising the base pressure significantiy. Desorption takes place at an equilibrium rate which, of course, is dependent upon the equilibrium pressure, and such desorbed gases are continuously removed by diffuaion pump or other pumping, whereby said overpressures or "bursts" of gases are removed without a rise in the equilibrium pressure and/or back diffusion of the gaseous pulse from the pumping cavity. (AEC)},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1962},
month = {6}
}