Shielding a test chamber for magnetic components enables it to maintain a constant, low magnetic field. The chamber is shielded from ambient magnetic fields by a lead foil cylinder maintained in a superconducting state by liquid helium

Hildebrandt, A. F.

English

NASA Technical Reports Server

Liquid Hel 
Liquid Nitrogen 
Superconducting 
Lead Foil
Magnetically Shielded
rChamber	
Dewar Vessels 
rv^
	 October 1965
	
NASA TECH BRIEF
	
Brief 65-10297 
NASA Tech Briefs are issued by the Technology Utilization Division to summarize specific 
technical innovations derived from the space program. Copies are available to the public from 
the Clearinghouse for Federal Scientific and Technical information, Springfield, Virginia, 22151. 
Superconductor Shields Test Chamber From Ambient Magnetic Fields 
The problem: Constructing an inexpensive test 
chamber that maintains a constant, low magnetic 
field. 
The solution: A test chamber that is shielded from 
ambient magnetic fields by a lead foil cylinder main-
tained in a superconducting state by liquid helium. 
How it's done: The lead cylinder,' constructed of 
0.007-inch-thick foil, is suspended in a Dewar vessel 
filled with liquid helium to cool the lead to a super-
conducting state. A current is induced in the lead foil 
cylinder by the application of a very small magnetic
field (less than 2 x 10 -5 gauss) during the cooling proc- 
ess. The central s pace within this Dewar system then 
encloses the initially applied small magnetic field at a 
constant value even in the presence of steady or chang- 
ing ambient magnetic fields. 
Notes: 
1. The internal field of this device has been demon- 
strated to be axially stable to better than +1 
gamma (10 — gauss) —2 gamma in an ambient field 
of 500 gamma. 
2. This innovation should be useful as a laboratory 
research and testing device for magnetic compo- 
nents. 
-	 (continued overleaf) 
This document was prepared under the sponsorship of the National 
Aeronautics and Space Administration. Neither the United States 
Government nor any person acting on behalf of the United States
Government assumes any liability resulting from the use of the 
information contained in this document, or warrants that such use 
will be free from privately owned rights.
https://ntrs.nasa.gov/search.jsp?R=19650000295 2020-03-11T17:20:33+00:00Z
3. Inquiries concerning this innovation may be di-
rected to:
Technology Utilization Officer 
Jet Propulsion Laboratory 
4800 Oak Grove Drive 
Pasadena, California. 91103 
Reference: B65-10297
Patent status: NASA encourages commercial use 
of this innovation. No patent action is contemplated 
by NASA.
Source: A. F. Hildebrandt 
(J PL-627) 
Brief 65-10297	 Category 02


Superconductor shields test chamber from ambient magnetic fields

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