DOE Patents title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: 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:
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}
}