Error field generation of solenoid magnets

Conference · Fri Jan 01 00:00:00 EST 1982

OSTI ID:5332743

Saunders, J L

Many applications for large solenoids and solenoidal arrays depend on the high precision of the axial field profile. In cases where requirements of ..delta..B/B for nonaxial fields are on the order of 10/sup -4/, the actual winding techniques of the solenoid need to be considered. Whereas an ideal solenoid consisting of current loops would generate no radial fields along the axis, in reality, the actual current-carrying conductors must follow spiral or helical paths. A straightforward method for determining the radial error fields generated by coils wound with actual techniques employed in magnet fabrication has been developed. The method devised uses a computer code which models a magnet by sending a single, current-carrying filament along the same path taken by the conductor during coil winding. Helical and spiral paths are simulated using small, straight-line current segments. This technique, whose results are presented in this paper, was used to predict radial field errors for the Elmo Bumpy Torus-Proof of Principle magnet. These results include effects due to various winding methods, not only spiral/helical and layer-to-layer transitions, but also the effects caused by worst-case tolerance conditions both from the conductor and the winding form (bobbin). Contributions made by extraneous circuitry (e.g., overhead buswork and incoming leads) are also mentioned.

• Research Organization: General Dynamics Corp., San Diego, CA (USA). Convair Div.
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 5332743
• Report Number(s): CONF-821108-33; ON: DE84003373
• Resource Relation: Conference: Applied superconductivity conference, Knoxville, TN, USA, 30 Nov 1982
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
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MAGNET COILS
ERRORS
SOLENOIDS
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ELECTRICAL EQUIPMENT
ELMO DEVICES
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MAGNETIC MIRRORS
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