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Journal Articles

Negative excursion of surface electric fields during gamma-ray glows in winter thunderstorms

Wada, Yuki*; Kamogawa, Masashi*; Kubo, Mamoru*; Enoto, Teruaki*; Hayashi, Shugo*; Sawano, Tatsuya*; Yonetoku, Daisuke*; Tsuchiya, Harufumi

Journal of Geophysical Research; Atmospheres, 128(21), p.e2023JD039354_1 - e2023JD039354_20, 2023/11

 Times Cited Count:0 Percentile:0.01(Meteorology & Atmospheric Sciences)

Journal Articles

On the spatial structure of solitary radial electric field at the plasma edge in toroidal confinement devices

Ito, Kimitaka*; Ito, Sanae*; Kamiya, Kensaku; Kasuya, Naohiro*

Plasma Physics and Controlled Fusion, 57(7), p.075008_1 - 075008_7, 2015/07

 Times Cited Count:19 Percentile:68.48(Physics, Fluids & Plasmas)

The solitary radial electric field in the edge of toroidal plasma is studied based on the electric field bifurcation model. Results are applied to tokamak and helical plasmas, and the dependence of the electric field structure on the plasma parameters and geometrical factors is analyzed. The order of magnitude estimate for tokamak plasma is not far from experimental observations. It is shown that, in helical plasmas, the height of electric field structure is reduced substantially owing to the ripple particle transport, while the width is influenced less. The implications of the results for the limit of achievable gradient in the H-mode pedestal are also discussed.

Journal Articles

Development of the radial dose distribution function relevant to the treatment planning system for heavy particle cancer therapy

Moribayashi, Kengo

Physica Scripta, 90(5), p.054013_1 - 054013_5, 2015/05

 Times Cited Count:5 Percentile:40.3(Physics, Multidisciplinary)

Journal Articles

Current clamp at zero level in JT-60U current hole plasmas

Fujita, Takaaki; Suzuki, Takahiro; Oikawa, Toshihiro; Isayama, Akihiko; Hatae, Takaki; Naito, Osamu; Sakamoto, Yoshiteru; Hayashi, Nobuhiko; Hamamatsu, Kiyotaka; Ide, Shunsuke; et al.

Physical Review Letters, 95(7), p.075001_1 - 075001_4, 2005/08

 Times Cited Count:14 Percentile:60.93(Physics, Multidisciplinary)

We found that no current can be driven in a central region of high-temperature, magnetically-confined, axi-symmetric torus plasma once the central current density becomes nearly zero ("current hole"), in spite of high electric conductivity. The current clamp was observed against current drive by a toroidal electric field and a radio-frequency wave in experiments on the JT-60U tokamak. This is a new, stiff, self-organized structure of magnetic field in an axi-symmetric torus plasma.

Journal Articles

Properties of internal transport barrier formation in JT-60U

Sakamoto, Yoshiteru; Suzuki, Takahiro; Ide, Shunsuke; Koide, Yoshihiko; Takenaga, Hidenobu; Kamada, Yutaka; Fujita, Takaaki; Fukuda, Takeshi; Takizuka, Tomonori; Shirai, Hiroshi; et al.

Nuclear Fusion, 44(8), p.876 - 882, 2004/08

 Times Cited Count:34 Percentile:71.92(Physics, Fluids & Plasmas)

Response of the ion thermal diffusivity to the radial electric field Er shear has been investigated in JT-60U and the following results were found. (1) In the case of positive magnetic shear (PS) plasma, the ion thermal diffusivity in the core region shows L mode state, weak internal transport barrier (ITB), and strong ITB depending upon the heating power. In the case of reversed magnetic shear (RS) plasma, however, no power degradation of the ion thermal diffusivity is observed. (2) In the case of weak ITB, the ion thermal diffusivity decreases gradually with increasing the Er shear for both PS and RS plasmas. There exists a threshold of an effective Er shear to change its state from weak to strong ITBs. (3) The threshold of the effective Er shear in the case of RS plasma is small compared with that in the case of PS plasma.

Journal Articles

Toroidal electric field effect and non-linear effect on electron cyclotron current drive in JT-60U

Suzuki, Takahiro; Ide, Shunsuke; Hamamatsu, Kiyotaka; Petty, C. C.*; Lao, L. L.*; Isayama, Akihiko; Fujita, Takaaki; Ikeda, Yoshitaka; Seki, Masami; Moriyama, Shinichi; et al.

Purazuma, Kaku Yugo Gakkai-Shi, 80(6), p.511 - 515, 2004/06

no abstracts in English

Journal Articles

Comparison of electron internal transport barriers in the large helical device and JT-60U plasmas

Ida, Katsumi*; Fujita, Takaaki; Fukuda, Takeshi*; Sakamoto, Yoshiteru; Ide, Shunsuke; Toi, Kazuo*; Inagaki, Shigeru*; Shimozuma, Takashi*; Kubo, Shin*; Idei, Hiroshi*; et al.

Plasma Physics and Controlled Fusion, 46(5A), p.A45 - A50, 2004/05

 Times Cited Count:19 Percentile:53.19(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Spatial structure of internal and edge transport barriers

Fujita, Takaaki

Plasma Physics and Controlled Fusion, 44(5A), p.A19 - A35, 2002/05

 Times Cited Count:28 Percentile:63.84(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Diagnostics for the fusion plasma by using the neutral beams

Suzuki, Takahiro; Sugie, Tatsuo

Purazuma, Kaku Yugo Gakkai-Shi, 78(5), p.411 - 416, 2002/05

no abstracts in English

Journal Articles

Radial patterns of instability and transport in JT-60U internal transport barrier discharges

Rewoldt, G.*; Hill, K. W.*; Nazikian, R. M.*; Tang, W. M.*; Shirai, Hiroshi; Sakamoto, Yoshiteru; Kishimoto, Yasuaki; Ide, Shunsuke; Fujita, Takaaki

Nuclear Fusion, 42(4), p.403 - 411, 2002/04

 Times Cited Count:9 Percentile:30.32(Physics, Fluids & Plasmas)

One class of internal transport barrier discharge in the JT-60U tokamak is characterized by two relatively flat regions of the pressure separated by a region with very large pressure gradient. Linear growth rates for toroidal drift type modes are calculated for discharges in this class, without and with sheared $$E$$$$times$$$$B$$ rotation effects. For cases with fully developed barriers, the results with rotation are consistent with a picture in which the radial electric field generated in part by the steep pressure gradient causes local stabilization, and thus reduction of the local anomalous transport, which allows the steep pressure gradient to persist. If rotation is omitted from the calculation for these cases, or if rotation is included for cases without barriers or with partially developed barriers, the unstable region spreads into the steep pressure gradient region.

Journal Articles

Relations among potential change, fluctuation change and transport barrier in the JFT-2M tokamak

Miura, Yukitoshi; Ido, Takeshi*; Kamiya, Kensaku; Hamada, Yasuji*; JFT-2M Group

Nuclear Fusion, 41(8), p.973 - 979, 2001/08

 Times Cited Count:17 Percentile:47.27(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Generation of radial electric field in the process of full reconnection by kinetic kink mode

Matsumoto, Taro; Tokuda, Shinji; Kishimoto, Yasuaki; Naito, Hiroshi*

Earth Planets and Space, 53(6), p.565 - 570, 2001/06

 Times Cited Count:0 Percentile:0.01(Geosciences, Multidisciplinary)

no abstracts in English

Journal Articles

Generation of radial electric field in the process of full reconnection by kinetic kink mode

Matsumoto, Taro; Tokuda, Shinji; Kishimoto, Yasuaki; Naito, Hiroshi*

Earth Planets and Space, 53(6), p.565 - 570, 2001/00

no abstracts in English

Journal Articles

Active control of internal transport barrier and confinement database in JT-60U reversed shear plasma

Sakamoto, Yoshiteru; Takizuka, Tomonori; Shirai, Hiroshi; Fujita, Takaaki; Kamada, Yutaka; Ide, Shunsuke; Fukuda, Takeshi; Koide, Yoshihiko

Journal of Plasma and Fusion Research SERIES, Vol.4, p.249 - 252, 2001/00

no abstracts in English

Journal Articles

Particle simulation study of the effect of radial electric field on scrape-off layer plasma and sheath formation

Takizuka, Tomonori; Hosokawa, Masanari*

Contributions to Plasma Physics, 40(3-4), p.471 - 477, 2000/11

 Times Cited Count:19 Percentile:51.35(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Runaway electrons in magnetic turbulence and runway current termination in discharges

Yoshino, Ryuji; Tokuda, Shinji

Nuclear Fusion, 40(7), p.1293 - 1309, 2000/07

 Times Cited Count:137 Percentile:95.52(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

High energy electron by laser wakefield acceleration

Nakajima, Kazuhisa; Dewa, Hidenori; Kando, Masaki; Hosokai, Tomonao; Kotaki, Hideyuki

Genshiryoku eye, 46(6), p.62 - 63, 2000/06

no abstracts in English

Journal Articles

$$^{57}$$Fe M$"o$ssbauer spectroscopic study of U$$_{6}$$Fe

Tsutsui, Satoshi; Kobayashi, Yasuhiro*; Nakada, Masami; Nasu, Saburo*; Yamamoto, Etsuji; Haga, Yoshinori; Onuki, Yoshichika

Journal of the Physical Society of Japan, 69(6), p.1764 - 1768, 2000/06

 Times Cited Count:2 Percentile:25.38(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Role of radial electric field and plasma rotation in the time evolution of internal transport barrier in JT-60U

Shirai, Hiroshi; Kikuchi, Mitsuru; Takizuka, Tomonori; Fujita, Takaaki; Koide, Yoshihiko; Sakamoto, Yoshiteru; Naito, Osamu; Hatae, Takaki; Isayama, Akihiko; Kamada, Yutaka; et al.

Plasma Physics and Controlled Fusion, 42(suppl.5A), p.A109 - A115, 2000/05

 Times Cited Count:28 Percentile:64.2(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Temporal behaviour of the potential and fluctuations at the L/H transition on JFT-2M

Ido, Tsuyoshi; Kamiya, Kensaku; Miura, Yukitoshi; Hamada, Yasuji*; Nishizawa, Akimitsu*; Kawasumi, Yoshiaki*

Plasma Physics and Controlled Fusion, 42(5A), p.A309 - A315, 2000/05

 Times Cited Count:18 Percentile:47.9(Physics, Fluids & Plasmas)

no abstracts in English

43 (Records 1-20 displayed on this page)