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Fabrication process qualification of TF Insert Coil using real ITER TF conductor

尾関 秀将; 礒野 高明; 河野 勝己; 齊藤 徹; 川崎 勉; 西野 克巳; 奥野 清; 木戸 修一*; 仙波 智行*; 鈴木 洋三*; et al.

IEEE Transactions on Applied Superconductivity, 25(3), p.4200804_1 - 4200804_4, 2015/06

 被引用回数:0 パーセンタイル:100(Engineering, Electrical & Electronic)

JAEA is planning performance test of 50 m Toroidal Field (TF) conductor of ITER using Central Solenoid Model Coil (CSMC) test facility at Naka-site in Japan. In order to test the conductor, "TF Insert Coil" (TFIC) is under fabrication in cooperate with Hitachi, Ltd. TFIC is a solenoid coil wound in 1.44 m diameter. It is going to be installed into the bore of CSMC, whose maximum magnetic field is 13 T. The maximum driven current of TFIC is 68 kA. In order to prepare for fabrication of TFIC, several trials of components including windings, removal of Cr plating of the strands, welding and compaction of terminal sleeve were carried out for process qualification. The results of trials showed that the winding dimater satisfied its criterion, the Cr plating was clearly removed using non-woven cloth soaked into HCl solution, the mechanical strengths at 4 K of welds at the terminal were enough. Eventually, the fabrication process qualification of TFIC was completed.


Ultralow emittance beam production based on Doppler laser cooling and coupling resonance

野田 章*; 中尾 政夫*; 岡本 宏巳*; 大崎 一哉*; 百合 庸介; 想田 光*; 頓宮 拓*; 神保 光一*; Grieser, M.*; He, Z.*; et al.

Proceedings of 5th International Particle Accelerator Conference (IPAC '14) (Internet), p.28 - 33, 2014/07

Three-dimensional (3D) cooling of 40-keV $$^{24}$$Mg$$^+$$ ion beams with Doppler laser cooling and the coupling resonance has been demonstrated in the storage ring S-LSR of Kyoto University toward the production of ultralow-emittance beams, in other words, ultracold beams and so-called crystalline beams. So far, the transverse temperatures of 6 K and 2 K have been experimentally attained in the horizontal and vertical directions, respectively, at a low beam intensity of about $$10^4$$ ions in the ring. These temperatures are the lowest ever attained by laser cooling of ion beams. Systematic molecular dynamics simulations predict the realization of further lower temperatures, $$approx$$ 1 mK and $$approx$$ 0.1 K in the longitudinal and transverse directions, respectively, if the laser spot size and detuning are properly adjusted even with such a low laser power ($$approx$$ 10 mW) as utilized in the experiments at S-LSR. A 3D ordered state of the beam with 3D laser cooling is also predicted. Recent experimental achievements and latest simulation results are presented.


Approach to the low temperature state oriented for crystalline beam

野田 章*; 中尾 政夫*; 想田 光*; 頓宮 拓*; 神保 光一*; 岡本 宏巳*; 大崎 一哉*; 百合 庸介; Meshkov, I.*; Smirnov, A.*; et al.

Proceedings of 23rd Russian Particle Accelerator Conference (RuPAC 2012) (Internet), p.48 - 52, 2012/09

Various approaches to attaining low-temperature beams have been continued in the cooler storage ring S-LSR at Kyoto University. One-dimensional ordering of electron-cooled 7-MeV protons was realized with an abrupt longitudinal temperature jump from 2 K to 0.3 K at a particle number of around 2000. Laser cooling has been applied to 40-keV $$^{24}$$Mg$$^+$$ beams toward the realization of crystalline beams. For a coasting beam, the lowest longitudinal temperature of 3.6 K was attained at $$4 times 10^4$$ ions. The temperature was limited due to intra-beam scattering (IBS). On the other hand, the transverse temperature of the beam indirectly cooled through IBS was saturated at 500 K for $$2 times 10^7$$ ions. In order to cool the transverse direction further, synchro-betatron resonance coupling has been applied to a bunched Mg beam. The transverse temperature has been reduced to the order of $$10^1$$ K at the beam intensity of $$10^4$$ ions by the reduction of the beam intensity using a scraper.


Simulation of dynamics of carbon dust particles in the JT-60U tokamak

田中 康規*; Smirnov, R. D.*; Pigarov, A. Y.*; 竹永 秀信; 朝倉 伸幸; 上杉 喜彦*; 大野 哲靖*

Journal of Nuclear Materials, 415(Suppl.1), p.S1106 - S1110, 2011/08

 被引用回数:7 パーセンタイル:44.16(Materials Science, Multidisciplinary)



Release conditions of dust particle from plasma-facing wall in oblique magnetic field

冨田 幸博*; 河村 学思*; Smirnov, R.*; 滝塚 知典; Tskhakaya, D.*

Journal of Nuclear Materials, 390-391, p.164 - 167, 2009/06

 被引用回数:3 パーセンタイル:72.81(Materials Science, Multidisciplinary)



Effect of oblieque magnetic field on release conditions of dust particle from plasma-facing wall

冨田 幸博*; Smirnov, R. D.*; 滝塚 知典; Tskhakaya, D.*

Contributions to Plasma Physics, 48(1-3), p.285 - 289, 2008/03

 被引用回数:6 パーセンタイル:71.96(Physics, Fluids & Plasmas)



Effect of truncation of electron velocity distribution on release of dust particle from plasma-facing wall

冨田 幸博*; Smirnov, R.*; 中村 浩章*; Zhu, S.*; 滝塚 知典; Tskhakaya, D.*

Journal of Nuclear Materials, 363-365, p.264 - 269, 2007/06

 被引用回数:5 パーセンタイル:59.58(Materials Science, Multidisciplinary)




白井 敏之*; 田辺 幹夫*; 想田 光*; 池上 将弘*; 藤本 慎司*; 頓宮 拓*; 野田 章*; 野田 耕司*; 渋谷 真二*; 藤本 哲也*; et al.

Proceedings of 9th Symposium on Accelerator and Related Technology for Application, p.19 - 22, 2007/06

The ion storage ring, S-LSR has an electron beam cooler and a laser cooling system. The electron cooler for S-LSR was designed to maximize the effective cooling length in the limited drift space of the ring. Various experiments have been carried out using the electron beam cooling, such as the sweep electron cooling, the one-dimensional ordering experiment of protons, and the short bunch generation. The laser cooling experiment is also currently in progress. Concerning the one-dimensional ordering experiment, the first proton ordering was successfully confirmed. An abrupt drop in the momentum spread and the Schottky noise power have been observed at the proton number of 2000 with electron currents of 25 mA. The transition temperature of the proton ordering is 0.17 meV in the longitudinal direction.


Benchmarking of lower hybrid current drive codes with application to ITER-relevant regimes

Bonoli, P. T.*; Harvey, R. W.*; Kessel, C. E.*; Imbeaux, F.*; 及川 聡洋; Schneider, M.*; Barbato, E.*; Decker, J.*; Giruzzi, G.*; Forest, C. B.*; et al.

Proceedings of 21st IAEA Fusion Energy Conference (FEC 2006) (CD-ROM), 8 Pages, 2007/03



Charging of a spherical dust particle on a plasma-facing wall

冨田 幸博*; Smirnov, R.*; 滝塚 知典; Tskhakaya, D.*

Journal of Plasma Physics, 72(6), p.1015 - 1018, 2006/12

 被引用回数:2 パーセンタイル:92.12(Physics, Fluids & Plasmas)



Gravitational effect on release conditions of dust particle from plasma-facing wall

冨田 幸博*; Smirnov, R.*; 滝塚 知典; Tskhakaya, D.*

Contributions to Plasma Physics, 46(7-9), p.617 - 622, 2006/09

 被引用回数:4 パーセンタイル:83.81(Physics, Fluids & Plasmas)



Two-dimensional simulation study on charging of dust particle on plasma-facing wall

Smirnov, R.*; 冨田 幸博*; Tskhakaya, D.*; 滝塚 知典

Contributions to Plasma Physics, 46(7-9), p.623 - 627, 2006/09

 被引用回数:6 パーセンタイル:76.31(Physics, Fluids & Plasmas)



Microdroplet evolution induced by a laser pulse

Smirnov, M. B.*; Skobelev, I. Y.*; Magunov, A. I.*; Faenov, A. Y.*; Pikuz, T. A.*; 福田 祐仁; 山川 考一; 赤羽 温; 青山 誠; 井上 典洋*; et al.

Journal of Experimental and Theoretical Physics, 98(6), p.1123 - 1132, 2004/06



ITER TF導体を用いたインサート・コイルの製作

尾関 秀将; 礒野 高明; 河野 勝己; 齊藤 徹; 川崎 勉; 西野 克巳; 奥野 清; 木戸 修一*; 仙波 智行*; 鈴木 洋三*; et al.

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