SEARCH · Search NASA
Results for “CRYOSORPTION”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
Cryosorption - a method for simulating the space vacuum environment
Cryosorption chamber for cryogenic testing of spacecraft in simulated space vacuums
The dynamics of cryosorption pumping
Dynamics of cryosorption pumping of air, argon, and hydrogen by activated charcoal
Cryosorption - a method for simulating the space vacuum environment.
Simulated space vacuum environment by cryosorption pumping system
Role of Cryosorption in Ultrahigh-Vacuum Systems
Cryogenic pumping and cryosorption in ultrahigh vacuum systems
Some Theoretical Aspect of Cryosorption
When a gas or vapor is allowed to come to equilibrium with a solid surface, the concentration of gas molecules is always found to be greater in the immediate vicinity of the surface than in the free gas phase, regardless of the nature of the gas or of the surface. The process by which this surface excess is formed is termed adsorption. In any solid, the atoms at the surface are subject to unbalanced forces of attraction normal to the surface plane; the balance of forces is partially restored by the adsorption of gas molecules. If the forces responsible for adsorption are of van der Waals type, the process is called physical adsorption. Furthermore, if the solid (and its surface) are maintained at relatively low temperatures (say 50°K or below), the term cryosorption is used.
Extreme vacuum technology including cryosorption, diffusion pump and pressure calibration studies Quarterly status report no. 8, 1 May - 1 Aug. 1965
Cryosorption, diffusion pump, and low pressure calibration studies on Penning gauge and cold cathode magnetron
Extreme vacuum technology including cryosorption, diffusion pump and pressure calibration studies Summary technical report, 1 Feb. 1965 - 1 Mar. 1966
Cryosorption, diffusion pump, and pressure calibration studies in extreme vacuum science and technology application program
The dynamics of cryosorption pumping.
Dynamic measurements of speed of pumping by activated charcoal cooled to liquid nitrogen temperatures to evaluate cryosorption
Cryopumping-cryosorption array system for a 3 foot times 3 foot vacuum facility Final report
Performance testing of cryopumping-cryosorption array system
Extreme vacuum technology including cryosorption, diffusion pump and pressure calibration studies quarterly status report no. 7, 1 feb. - 1 may, 1965
Effectiveness of chemical trap in reducing residual gas in ultrahigh vacuum systems by oil diffusion pump
What's old is new again- an activated charcoal cryosorption pump for the Dragonfly gamma ray spectrometer
Explore the source record for details and available documents.
Creation of space vacuum utilizing cryogenic techniques.
Ultrahigh vacuum facility to approach pressure environment of space, utilizing cryopumping and cryosorption
Design of an ultrahigh-vacuum space simulator.
Simulated space vacuum environment by cryosorption pumping system
Sorption pumping of residual gases at cryogenic temperatures.
Cryogenic and cryosorption pumping of residual gases for clean test volume
Creation of space vacuum utilizing cryogenic techniques
Ultrahigh space vacuum simulation utilizing cryopumping and cryosorption techniques
Cryogenic applications for environment simulation.
Some of the applications of cryogenics for simulating space environmental conditions are reviewed, and typical existing space simulation facilities are described. The techniques of adapting cryogenics to environmental simulation are discussed. Special attention is given to cryosorption pumps designed to accelerate cryogenic cooling of the adsorbent material.
The Instrument Test Dewar (ITD): Testing satellite instruments at 1.5 K
The Instrument Test Dewar (ITD) is a cryogenic facility designed and built to test Cosmic Background Explorer (COBE) satellite instruments at 1.5 K. The facility provides a high vacuum and thermal environment with payload thermal, electrical and optical interfaces. There are two concentric vacuum spaces which are not hermitically sealed. The instrument vacuum space is 81.28 cm by 243.84 cm and is cooled by an LHe shroud. The guard vacuum space surrounds an LN2 shroud. There are two separate cryosorption pumping systems and a mechanical LHe pumping system. The data acquisition systems provide payload and housekeeping data. There have been various problems with the facility, and changes and improvements have been made to assure optimum test conditions. COBE instrument testing has been completed on structural, thermal model hardware and the protoflight units.