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金正 倫計; 神谷 潤一郎; 小泉 欧児*; 那須 昌吾*
Proceedings of 15th Annual Meeting of Particle Accelerator Society of Japan (インターネット), p.668 - 670, 2018/08
J-PARC 3GeVシンクロトロン(RCS)では、リニアックで加速された負水素イオン(H
イオン)を薄膜で陽子に変換する荷電変換入射方式を採用している。この薄膜の寿命が加速器の運転時間を決めるため、荷電変換膜のビームに対する破壊機構を知ることは、加速器を安定に運転する上で重要である。本研究では、荷電変換膜のビームによる破壊機構を解明することを目的として、ラマン分光法により、薄膜の結晶性, 膜組成, 応力等を評価した。RCSで使用しているフォイルは、レーザーによる入熱に対して、大きな応力が発生することが分かった。
神谷 潤一郎; 金正 倫計; 阿部 和彦*; 比嘉 究作*; 小泉 欧児*
Journal of Vacuum Science and Technology A, 36(3), p.03E106_1 - 03E106_10, 2018/05
被引用回数：0 パーセンタイル：0.01(Materials Science, Coatings & Films)J-PARC RCS入射部における懸案事項は、装置が密集しているため保守作業を円滑にするうえで理想的な箇所にベローズが配置できていないことであった。具体的には四極電磁石用と水平シフトバンプ電磁石用のセラミックスビームパイプどうしがフランジを介して接続されている。我々はRCS真空システムの構築を通じて得た、セラミックスビームパイプおよびチタン製低反力ベローズの知見を活用し、セラミックスの形状を改良して長手方向に空間を作り、そこへベローズを挿入するという新しい構造のビームパイプの製作を行うこととした。シフトバンプ電磁石用セラミックスビームパイプについては、フランジ温度がコイルからの漏えい磁場による発熱で、現状で120度にもなっているためこれ以上短くするのは望ましくないことから、四極電磁石用セラミックスビームパイプに対してベローズを有する構造を適用することとした。本報告では保守性を向上させるためにベローズを有する構造へ改良した大口径アルミナセラミックスビームパイプの開発について、設計思想、課題、および各コンポーネントの検証について発表する。
荻原 徳男; 神谷 潤一郎; 菖蒲田 義博; 金正 倫計; 小泉 欧児*
Proceedings of 4th International Particle Accelerator Conference (IPAC '13) (Internet), p.3321 - 3323, 2014/07
In the 3 GeV-RCS (Rapid Cycling Synchrotron) in J-PARC (Japan Accelerator Research Complex) project, large-scale hydro-formed bellows were developed to adjust the gap between the ceramic ducts and/or between the ceramic ducts and the transport ducts. They have been equipped with a newly developed RF shield, because the usual beryllium-copper spring finger contacts were found to be very hard (roughly 1000 N/mm) owing to the large size. The newly developed RF shield is made of metal braid, which consists of wires with a diameter of 0.3-0.5 mm. Because of the spring effect, the contact can change shape easily. In addition, the shield can easily connect the different cross sections in a smooth fashion. Furthermore, this structure is almost free from the dust generation, which is one of the most troublesome problems for the usual spring finger contacts.
小泉 欧児*; 井上 勝*; 荻原 徳男; 神谷 潤一郎; 金正 倫計
no journal, ,
In the 3 GeV Rapid Cycling Synchrotron (RCS) in the Japan Accelerator Research Complex (J-PARC) project, large-scale bellows were needed to adjust the gap between the ceramic ducts and between the ceramic ducts and the transport ducts. The space for setting the bellows are so narrow that the requirements for the bellows were severe. Typical free length and inner diameter of the bellows were 100 mm and 300-400 mm, respectively; nevertheless, the spring rate of less than 100 N/mm was needed. Then pure Ti and SUS 316L steel were selected as materials for bellows; Ti bellows were set in the high radiation field because of its small residual radioactivity, and the SUS 316L bellows in the other area. We have developed the hydro-formed bellows as flexible as welded bellows. Then, we have developed the new polishing method "wet mechanical polishing". Using the fluid containing the minute particles of abrasive we have succeeded to polish the inner-surface of the complicated shape. The average roughness factor Ra of 0.05 
m was obtained. After assembling, mainly to reduce the hydrogen inventory in the bellows, all the bellows have been vacuum-fired for 10h at 650
C for Ti bellows, and at 750C for SUS316L bellows, respectively. Thus we have succeeded in developing the large-scale hydro-formed bellows with the inner-surface polishing, as flexible as welded bellows.
神谷 潤一郎
小泉 欧児*; 那須 昌吾*
A radiation shielding material that is lighter and has lower installation restrictions than conventional methods, and that exhibits excellent shielding efficiency against radiation in the high energy region. The radiation shielding material comprises a complex containing a fibrous nanocarbon material, a primary radiation shielding particle, and a binder, wherein the fibrous nanocarbon material and the primary radiation shielding particle are dispersed in the binder.
神谷 潤一郎
小泉 欧児*; 那須 昌吾*
特願 18843387.4 
公開特許公報
The present invention provides a radiation shielding material that is lighter and has lower installation restriction than conventional methods, and that exhibits excellent shielding efficiency against radiation in the high energy region. The radiation shielding material of the present invention comprises a complex containing a fibrous nanocarbon material, a primary radiation shielding particle, and a binder, wherein the fibrous nanocarbon material and the primary radiation shielding particle are dispersed in the binder.
神谷 潤一郎
小泉 欧児*; 那須 昌吾*
特願 18843387.4 公開特許公報
Provided is a radiation-shielding material which is lighter in weight than the conventional ones, has few restrictions on installation and has an excellent shielding factor for radiation in a high energy region. The radiation-shielding material according to the present invention comprises a composite including a fibrous nanocarbon material, first radiation-shielding particles, and a binder, wherein the fibrous nanocarbon material and the first radiation-shielding particles are dispersed in the binder.
