Design and construction of cryopump is reported that feeds from primary source to cool component up to 30 ft from source. Liquid oxygen or nitrogen is gravity fed through loop system to copper fibers enclosing component at room temperature where fluid boils, cools object, vaporizes and recycles through tubing loop

Batson, P. J.

Milleron, N.

English

NASA Technical Reports Server

December 1972
	 B72-10314 
•	
AEC-NASA TECH BRIEF 
Lawrence Berkeley Laboratory 
AEC-NASA Tech Briefs announce new technology derived from the research and development program of the U.S. AEC 
or from AEC-NASA interagency efforts. They are issued to encourage commercial application. Tech Briefs are available 
on a subscription basis from the National Technical information Service, Springfield, Virginia 22151. Requests for 
individual copies or questions relating to the Tech Brief program may be directed to the Technology Utilization Office, 
NASA, Code KT, Washington, D.C. 20546. 
A Cryopump for Cooling Objects at a Distance 
.
Primary 
. Source 
Heat
Insulation 
The problem: 
In cryogenic applications, there is a frequent require-
ment for cooling components that are not in the proxim-
ity of the primary cooling source. An example of such 
a requirement includes superconducting magnet coils 
which are to be cooled simultaneously.
ctOr 
smperature 
)fl: 
imp has been developed, which is fed from 
source, for cooling a component located up 
to 3 m (10 ft) away from the source. 
How it's done: 
The cryopump, as shown in the figure, receives liquid 
gas from the primary source through the insulated tubing. 
The gas is gravity fed into the cryopump chamber until 
it breaks through the surface tension in a screen and en-
ters the internal tube. This tube is a loop connected to 
the heat conductor which is located about 2.5 cm from 
(continued overleaf) 
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Energy Commission and/or the National Aeronautics and Space document, or warrants that the use of any information, apparatus, 
Administration. Neither the United States Government nor any per- method, or process disclosed in this document may not infringe pri-
son acting on behalf of the United States Government assumes any vately owned rights.
C
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the bottom. The conductor is at room temperature and 
conveys approximately 1 W to the liquid gas, causing it 
to boil. As a result of boiling, a geyser-like effect is 
created which forces the liquid out of the top outlet and 
into the fibers. These fibers are made of very thin strands 
of copper wire which are connected to the object. Liquid 
gas boiling through these fibers removes the heat from 
the object and vaporizes. The vaporized gas returns to 
the primary source through the same tube for recycling. 
The developed pump uses liquid oxygen or nitrogen 
and will operate in the temperature range between 50 to 
100 K. Two or more of these pumps may be cascaded to 
extend the lateral and/or vertical cryopumping distance.
Note: 
Requests for further information may be directed to: 
Mr. Robert J. Morris 
Technical Information Division 
Lawrence Berkeley Laboratory 
University of California 
Berkeley, California 94720 
Reference: B72-10314 
Patent status: 
No patent action is contemplated by AEC or NASA. 
Source: N. Milleron and P. J. Batson 
Lawrence Berkeley Laboratory 
(LRL- 1003 1)
S 
B72-l0314
	 Category 03


A cryopump for cooling objects at a distance

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