Eddy Current Effects of the J-PARC RCS Sextupole Magnets
Eddy Current Effects of the J-PARC RCS Sextupole Magnets
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DOI：
10.1109/tasc.2008.920538
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发表时间：
2008-06
影响因子：
1.8
通讯作者：
S. Igarashi;T. Adachi;H. Someya;N. Tani;Y. Watanabe
中科院分区：
文献类型：
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作者：
S. Igarashi;T. Adachi;H. Someya;N. Tani;Y. Watanabe
用于日本质子加速器研究综合体的快速循环同步加速器的色度校正的六极磁体具有330 mm的大孔径和320 mm的相对短的长度。因此，不可忽视，三对于设计的最大磁场梯度，需要进行三维磁场计算，以达到半径141.2 mm内所需的磁场质量18.6T/m。考虑了涡流对磁场质量和温升的影响，因为磁体将用频率为25 Hz的电流模式激励。使用谐波线圈的测量证实达到了所需的磁场质量。用磁场计算程序OPERA 3d/ELEKTRA再现了六极分量和18极分量场的测量结果。
Sextupole magnets for the chromaticity correction of the rapid-cycling synchrotron of the Japan Proton Accelerator Research Complex have a large bore of 330 mm and a relatively short length of 320 mm. The end effect, therefore, was not negligible and a three-dimensional magnetic field calculation was necessary to achieve the required field quality of inside the radius of 141.2 mm for the designed maximum field gradient of 18.6 T/m. Eddy current effect on the field quality and temperature rise was considered because the magnets were to be excited with a current pattern of a frequency of 25 Hz. Measurement using harmonic coils confirmed that the required field quality was achieved. Measurement results of the sextupole component and 18-pole component field were reproduced with the magnetic field calculation program OPERA3d/ELEKTRA.