Fukami K, Inagaki T, Iwashita T, Nakanishi H, Nishimori N, Takano S, Takemura Y, Taniuchi T, Watanabe T, Yamaguchi H, Tanaka H
Japan Synchrotron Radiation Research Institute, Hyogo 679-5198, Japan.
RIKEN SPring-8 Center, Hyogo 679-5148, Japan.
Rev Sci Instrum. 2022 Feb 1;93(2):023301. doi: 10.1063/5.0074226.
In high-frequency pulsed magnets, such as kickers in particle accelerators, it is essential to reduce eddy currents that could be induced in the magnet core during excitation not to distort and attenuate the magnetic field pulse. A novel iron lamination scheme with additional interlaminar insulation is proposed for the magnet core of such pulsed magnets. A laminated steel sheet core is formed by alternately stacking thin steel and insulation sheets. For application to matched kicker magnets for accelerators, test magnets with the new and conventional iron lamination were designed, assembled, and extensively evaluated. The pulsed magnetic field waveforms of two test magnets with the new lamination successfully matched to below 0.1% over the entire pulse duration, which was significantly better than those with the conventional lamination. Among the applications of the developed high-frequency pulsed magnets, beam injection kickers for the coming next generation light sources and future colliders, where suppression of the transient stored-beam oscillation during beam injection is crucial, are considered to be promising.
在高频脉冲磁铁中，例如粒子加速器中的冲击磁铁，在励磁过程中减少可能在磁芯中感应出的涡流以避免扭曲和衰减磁场脉冲至关重要。针对此类脉冲磁铁的磁芯，提出了一种带有额外层间绝缘的新型铁芯叠片方案。叠片式钢板磁芯由薄钢板和绝缘片交替堆叠而成。为了应用于加速器的匹配冲击磁铁，设计、组装并广泛评估了采用新型和传统铁芯叠片的测试磁铁。采用新型叠片的两个测试磁铁的脉冲磁场波形在整个脉冲持续时间内成功匹配至低于0.1%，这明显优于采用传统叠片的测试磁铁。在已开发的高频脉冲磁铁的应用中，用于下一代光源和未来对撞机的束流注入冲击磁铁被认为具有前景，在这些应用中，抑制束流注入期间的瞬态储存束流振荡至关重要。
