Effects of a hybrid superconducting three-pole wiggler on the stored beam at the SAGA-LS storage ring
Effects of a hybrid superconducting three-pole wiggler on the stored beam at the SAGA-LS storage ring
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混合超导三极摆动器对 SAGA-LS 存储环存储光束的影响
DOI：
10.1016/j.nima.2012.04.047
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
T. Kaneyasu
中科院分区：
文献类型：
--
作者：
S. Koda;Y. Iwasaki;Y. Takabayashi;T. Kaneyasu
为了评估混合三极摆动器在实际存储环上的适用性，在Saga光源的1.4GeV存储环上研究了混合三极摆动器对光束的实际影响。摆动器的开发目的是产生大约 40keV 的硬 X 射线。磁体系统由三个隔离极组成：一个超导主极和两个常导侧极。为了抑制由隔离极结构引起的第二磁场积分的增加，为主极产生负磁场的厚场夹位于主极的两端。这种带有磁场钳位的隔离极结构产生了不寻常的磁场分布。通过测量研究了摆动场对存储环的实际影响（例如，聚焦力、六极杆强度、辐射功率和光束发射率）。计算结果与实际磁场计算模型基本吻合，并通过磁场测量结果进行了修正。实际的多极效应是相对可以容忍或可控的。此外，场钳位和常导侧极的采用，有助于降低侧极峰值场，从而减少侧极曲率分布引起的束流效应。
Practical effects of a hybrid three-pole wiggler on the beam was investigated at 1.4GeV storage ring of Saga light source in the viewpoint of evaluation of the applicability of the wiggler on actual storage ring. The wiggler was developed to generate hard X-rays up to 40keV approximately. The magnet system consisted of three isolated poles—a superconducting main pole and two normal-conducting side poles. To suppress the increase in the second magnetic field integral caused by the isolated pole structure, thick field clamps that generate a negative field for the main pole were located at both ends of the main pole. This isolated pole structure with field clamps generated an unusual field distribution. The practical effects of the wiggler field on the storage ring (e.g., the focusing force, the sextupole strength, radiation power and the beam emittance ) were investigated by performing measurements. The results agreed roughly with practical field calculation model, which was corrected by result of the magnetic field measurement. Practical multipole effects were relatively tolerable or controllable. In addition, the employment of the field clamps and the normal-conducting side pole, which contributed to the decrease of peak field of the side poles, brought about reduction of beam effects due to curvature distribution at the side poles.