Error field generation of solenoid magnets Page: 2 of 12
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INTRODUCTION
One of the requirements for the design of the Elmo Bumpy Torus-
Proof of Principle machine is that the cumulative error field (Br/B0),
with all of the coils energized, will not exceed 1 x 10 ~ 4 when averaged
around the torus along the minor axis. Figure 1 illustrates the EBT-P
machine at the time this work was performed.
A magnetic field of 4.8 tesla on axis at the coil throat is provided
by 36 solenoids in a toroidal array. With the given criteria, this cor-
responds to a maximum error field of 4.8 gauss. Allowing for possible
magnet misalignment, extraneous system circuitry, etc., the maximum
error field that could be tolerated by the system due to the coils
themselves was determined to be on the order of two gauss.
The question, then, was whether or not the winding technique
could be responsible for generating error fields on this order and, if so,
what method of winding would generate the minimum error field. It
was decided that a computer simulation of various winding techniques
would yield the most straightforward and accurate conclusion.
MAGNET PROTECTION RADIO
SYSTEM
FREQUENCY POWER
<o
POWER BUS
MICROWAVE
POWER tp**
\ ' PRIMARY
\ VACUUM PUMP
CRYOGENIC N2, He
MANIFOLDS
SUPPORT
STRUCTURE
SUPER-CONDUCTING
MAGNET
GYROTRON
WATER COOLANT MANIFOLDS
Figure 1. Elmo Bumpy Torus-Proof of Principle experiment.
2
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Saunders, J. L. Error field generation of solenoid magnets, article, January 1, 1982; United States. (https://digital.library.unt.edu/ark:/67531/metadc1067002/m1/2/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.