Direct drive and eddy-current septum magnets.

Kim, S. H.

Argonne National Laboratory

关键词: Eddy Currents;    Magnet Cores;    Septum Magnets;    43 Particle Accelerators;    Thickness;   

DOI  :  10.2172/786922
RP-ID  :  LS-292
RP-ID  :  W-31-109-ENG-38
RP-ID  :  786922

美国|英语

来源: UNT Digital Library

【 摘 要 】

Two types of thin septum magnets, direct drive and eddy current, were compared mainly in 2-D magnetic aspects. For the direct-drive type, the leakage field depended on the finite permeability of the magnet core and not on the thickness of the septum conductor. It was suggested that the leakage field be controlled by reducing the current in the septum conductor or by using a correction coil. There were no significant differences between the two types regarding thermal problems caused by high current densities in the thin septa. The leakage fields with 2-mm septum thicknesses were calculated using OPERA-2d to compare the two types. For the eddy-current type, the leakage fields calculated using OPERA-2d were compared with the calculations from Halbach's model. The leakage fields for the eddy-current type decayed with long time constants.