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Journal Articles

Beam separation experiment with prototype non-destructive electrostatic septum and study for device improvement

Nagayama, Shota; Harada, Hiroyuki; Shimogawa, Tetsushi*; Sato, Atsushi*; Yamada, Ippei; Chimura, Motoki; Kojima, Kunihiro; Yamamoto, Kazami; Kinsho, Michikazu

Proceedings of 20th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.526 - 530, 2023/11

We have been developing "Non-destructive electrostatic septum" for a slow extraction. This septum has multiple electrodes placed around the region without the beam hitting and separate the beam by its electric field. To evaluate its electric field, we have built a prototype septum and a test machine, which consists of an electron gun and monitors. This test machine can measure the electric field indirectly by using a narrow electron beam. The experiment results of prototype septum is good agreement with the calculation one. However, this electric field distribution is not enough to separate the beam. A step function-like electric field distribution is ideal for the beam separation with minimal negative effect on the beam. We have studied to improve the electrode configuration to match the beam shape. In this paper, we present the result of the electric field measurements and the septum improvement. Additionally, we describe the future plan of this development.

Journal Articles

Study of non-destructive slow beam extraction method in particle accelerator

Nagayama, Shota; Harada, Hiroyuki; Shimogawa, Tetsushi*; Yamada, Ippei; Chimura, Motoki; Yamamoto, Kazami; Kinsho, Michikazu

Proceedings of 19th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.503 - 507, 2023/01

Synchrotron accelerators realize physics experiments and radiation cancer treatment using the slow extraction technique, in which beams are stored in the ring and gradually delivered. We have devised and are currently developing a "non-destructive electrostatic septum" based on a new method, which in principle cannot be solved by conventional methods and is a cause of equipment failure and output limitation. It is ideal to generate a force distribution similar to a staircase function with discontinuous gaps at the boundary. In this presentation, we will show the calculation method for optimizing the electrode and wire configuration to generate a Lorentz force with a distribution similar to a staircase function in vacuum, and the calculation results of the beam breakup due to the generated Lorentz force. The compact proof-of-principle machine developed for the ongoing demonstration of this method will also be introduced.

Journal Articles

Proposal of non-destructive device for slow extraction

Shimogawa, Tetsushi*; Harada, Hiroyuki

Proceedings of 16th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.1156 - 1158, 2019/07

A particle beam from accelerators has been applied not only to physics experiments but also medical applications. In the slow extraction which extract beam from a synchrotron during a large number of turns, the accelerated beam is blown up and extracted by the electrostatic septum. The septum consists of electrode and septum for separating between extraction and circulating beam. Generally, the wire and plate are used for septum. In this case, the beam hits on septum. Consequently, the extraction efficiency and the beam power are limited. We propose the non-destructive electrostatic septum. The multiple electrodes arrange surround the beam and produce the electric field for separation and deflect the beam. There are no materials in the beam orbit area. This will be reported introduction of our proposed non-destructive electrostatic septum.

Journal Articles

Clinical significance of L-type amino acid transporter 1 expression as a prognostic marker and potential of new targeting therapy in biliary tract cancer

Kaira, Kyoichi*; Sunose, Yutaka*; Ohshima, Yasuhiro; Ishioka, Noriko; Arakawa, Kazuhisa*; Ogawa, Tetsushi*; Sunaga, Noriaki*; Shimizu, Kimihiro*; Tominaga, Hideyuki*; Oriuchi, Noboru*; et al.

BMC Cancer, 13, p.482_1 - 482_12, 2013/10

 Times Cited Count:68 Percentile:89(Oncology)

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