Author: Mitsuda, C.
Paper Title Page
TUOCB03 Magnet Development for SPring-8 Upgrade 1093
  • T. Watanabe, T. Aoki, K. Fukami, S. Matsubara, C. Mitsuda, S. Takano, T. Taniuchi, K. Tsumaki
    JASRI/SPring-8, Hyogo-ken, Japan
  • T. Hara, H. Kimura
    RIKEN SPring-8 Center, Sayo-cho, Sayo-gun, Hyogo, Japan
  One of the features for newly designed magnets for the SPring-8 major upgrade plan* is permanent magnet based dipole magnets for substantial energy saving. The new dipole magnets have been designed to be equipped with (i) a field variable function by controlling magnetic flux into a beam axis, (ii) a nose structure on iron poles for smooth B-field transition in the longitudinal gradient field, and (iii) a nearly zero temperature coefficient of magnet circuit with the help of a shunt alloy**. Demagnetization due to radiation is also a critical issue. At SPring-8, demagnetization process has been intensively studied, and the effect has been considered in the design of dipole magnets. Although electromagnet based multi-pole magnets are rather conventional technologies, yet new magnets need to be designed to fit in the next generation high packing factor lattice with as reasonably lower energy consumption as possible. Magnet alignment will be a key development as well; in order to secure adequate dynamic apertures, magnets ought to be aligned within tens of microns. Current design and recent progress in the developments of magnets and alignment schemes will be presented.
* H. Tanaka et al., SPring-8 Upgrade Project, in the abstracts.
** T. Taniuchi et al., Proc. of IPAC2015, WEPMA050.
slides icon Slides TUOCB03 [4.014 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUOCB03  
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THPMW020 Solid-state Compact Kicker Pulsar using Strip-line Type Blumlein with SIC-MOSFET in Spring-8 3585
  • C. Mitsuda, T. Honiden, K. Kobayashi, T. Kobayashi, S. Sasaki
    JASRI/SPring-8, Hyogo-ken, Japan
  • N. Sekine
    Sekine Electric Works Co. Ltd, Osaka, Japan
  In the case of handling the electron beam by bunch-by-bunch and turn-by-turn with a kicker at the SPring-8, the performances required to a pulsar are short pulse width (<40ns) and high repetitions (>208kHz). In order to achieve these specifications, the short pulsed high voltage output and the utilization of the solid-state switch is necessary for an inductance load. In order to suppress the supplied voltage as low as as possible, it is an important feature to realize the extremely small-sized pulsar to be set near the kicker. On the basis of the experiences in developing the solid-state pulsar of 400ns/2kV using Si-MOSFET*, combination of the SiC-MOSFET and the strip-line type Blumlein pulse forming network (BPFN) was applied to the prototype driver to achieve a shorter pulse and higher power than Si-type driver. The completed pulsar accomplished a compact size (external dimensions; 300(H)x400(W)x400(D)mm). Furthermore, the targeted short-pulsed high voltage output of 123ns/12kV was obtained by 6 BPFNs serial connection to the load inductance of 800 nH. The BPFN detailed design to enable the compact size, high reliability and stability at high repetitions will be reported.
* C.Mitsuda et al., Proc. of IPAC2013, MOPAWA003
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW020  
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