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Featured researches published by Y. Ijiri.


Nuclear Fusion | 2001

First plasmas in Heliotron J

T. Obiki; T. Mizuuchi; K. Nagasaki; Hiroyuki Okada; F. Sano; K. Hanatani; Y. Liu; T. Hamada; Y. Manabe; Hiroyuki Shidara; W.L. Ang; Y. Ikeda; T. Kobayashi; T. Takamiya; M. Takeda; Y. Ijiri; T. Senju; K. Yaguchi; K. Sakamoto; Kiyoshi Toshi; M. Shibano; K. Kondo; S. Besshou; Y. Nakamura; M. Nakasuga; Masahiro Wakatani; Osamu Yamagishi; K. Aizawa; Y. Kawazome; S. Maeno

Results obtained in the initial experimental phase of Heliotron J are reported. Electron beam mapping of the magnetic surfaces at a reduced DC magnetic field has revealed that the observed surfaces are in basic agreement with the ones calculated on the basis of the measured ambient field around the device. For 53.2 GHz second harmonic ECH hydrogen plasmas, a fairly wide resonance range for breakdown and heating by the TE02 mode has been observed in Heliotron J as compared with that in Heliotron E. With ECH injection powers up to ≈ 400 kW, diamagnetic stored energies up to ≈ 0.7 kJ were obtained without optimized density control.


Nuclear Fusion | 2005

H-mode confinement of Heliotron J

F. Sano; T. Mizuuchi; K. Kondo; K. Nagasaki; Hiroyuki Okada; S. Kobayashi; K. Hanatani; Y. Nakamura; S. Yamamoto; Y. Torii; Yasuhiro Suzuki; Hiroyuki Shidara; M. Kaneko; Hajime Arimoto; T. Azuma; Jun Arakawa; Keisuke Ohashi; M. Kikutake; Nobuhide Shimazaki; T. Hamagami; G. Motojima; H. Yamazaki; Masaki Yamada; H. Kitagawa; T. Tsuji; H. Nakamura; Shinya Watanabe; S. Murakami; N. Nishino; M. Yokoyama

The L–H transition in a helical-axis heliotron, Heliotron J, is investigated. For electron cyclotron heating (ECH), neutral beam injection (NBI) heating and ECH + NBI combination heating plasmas, the confinement quality of the H-mode is examined with an emphasis on its magnetic configuration dependence. The vacuum edge rotational transform, ι(a)/2π, is chosen as a label for the magnetic configuration where ι/2π is the rotational transform and a is the average plasma minor radius in metres. The experimental ι(a)/2π dependence of the enhancement factor over the L-mode confinement reveals that specific configurations exist where high-quality H-modes (1.3 < HISS95 < 1.8) are attained. is the experimental global energy confinement time and is the confinement time scaling from the international stellarator database given as . R is the plasma major radius in metres, is the line-averaged plasma density in 1019 m−3, PL is the power loss in megawatts that accounts for the time derivative of the total plasma energy content and Bt is the toroidal magnetic field strength in tesla (Stroth U. et al 1996 Nucl. Fusion 36 1063). The ι (a)/2π ranges for these configurations are near values that are slightly less than those of the major natural resonances of Heliotron J, i.e. n/m = 4/8, 4/7 and 12/22. To better understand this configuration dependence, the geometrical poloidal viscous damping rate coefficient, Cp, is calculated for different values of ι(a)/2π and compared with the experimental results. The threshold line-averaged density of the H-mode, which depends on the configuration, is in the region of 0.7–2.0 × 1019 m−3 in ECH (0.29 MW) + NBI (0.57 MW) operation. As for the edge plasma characteristics, Langmuir probe measurements have shown a reduced fluctuation-induced transport in the region that begins inside the last closed flux surface (LCFS) and extends into the scrape-off layer. In addition, a negative radial electric field Er (or Er-shear) is simultaneously formed near the LCFS at the transition.


Fusion Technology | 1990

Recent Heliotron E physics study activities and engineering developments

T. Obiki; Masahiro Wakatani; Motoyasu Sato; S. Sudo; F. Sano; Takashi Mutoh; Kimitaka Itoh; K. Kondo; M. Nakasuga; K. Hanatani; H. Zushi; T. Mizuuchi; H. Kaneko; Hiroyuki Okada; Yasuhiko Takeiri; Y. Nakamura; S. Besshou; Y. Ijiri; Masashi Iima; T. Senju; K. Yaguchi; T. Baba; Sakuji Kobayashi; Keiji Matsuo; Katsunori Muraoka; Takashige Tsukishima; Masamitsu Nakajima

Recent studies of transport, magnetohydrodynamic stability, and divertor action on Heliotron E are summarized. A pellet injector and a new diagnostic system are developed. Moreover, the Heliotron groups is conducting research and development on heating and other new systems for the Large Helical Device.


Nuclear Fusion | 1986

Particle and energy balance analysis of a currentless high beta plasma in Heliotron E

F. Sano; T. Obiki; O. Motojima; Masahiko Sato; S. Sudo; K. Hanatani; H. Zushi; S. Besshou; T. Mutoh; H. Kaneko; T. Mizuuchi; Hiroyuki Okada; K. Kondo; S. Morimoto; M. Nakasuga; Y. Nakashima; K. Magome; M. Iima; T. Kawabata; I. Ohtake; Y. Ijiri; A. Iiyoshi; K. Uo

An ion and electron energy balance analysis has been made of the MHD stable high beta plasma produced by neutral beam injection in Heliotron E. The currentless target plasma was generated by 53.2 GHz second-harmonic ECH (~ 160 kW) at a magnetic field of Bh = 0.94 T. The linear density rise due to intense gas puffing during neutral beam injection increased the volume averaged beta value up to ≈ 1.5 − 2.0%. The results of 1-D transport codes show that the global energy balance is dominated by the electron loss channels in which radiation is predominant. The particle balance in the beam-assisted density rise phase cannot be accounted for without an inward convection of bulk particles, indicating a similarity to the transport of impurities. So far, the observed beta values are not restricted by MHD activity.


Fusion Science and Technology | 2004

Observation of H-mode operation windows for ECH plasmas in heliotron J

F. Sano; T. Mizuuchi; K. Nagasaki; Hiroyuki Okada; S. Kobayashi; K. Kondo; K. Hanatani; Y. Nakamura; M. Nakasuga; S. Besshou; S. Yamamoto; M. Yokoyama; Yasuhiro Suzuki; Y. Manabe; Hiroyuki Shidara; T. Takamiya; Y. Ohno; Y. Nishioka; Hidetoshi Yukimoto; Koichi Takahashi; Y. Fukagawa; H. Kawazome; M. Kaneko; S. Tsuboi; S. Nakazawa; S. Nishio; Masaki Yamada; Y. Ijiri; T. Senju; K. Yaguchi

Abstract The H-mode transition properties of 70-GHz, 0.4-MW electron cyclotron heating (ECH) plasmas in Heliotron J have been studied with special reference to their magnetic configuration dependences, such as the edge iota dependences. Two edge iota windows for the H-mode transition were observed to be (a) 0.54 < ɩ(a)/2π < 0.56 in separatrix discharge plasmas and (b) 0.62 < ɩ(a)/2π < 0.63 in partial wall-limiter discharge plasmas if a certain threshold line-averaged electron density ([overbar]ne = 1.2-1.6 × 1019 m-3) is achieved, where ɩ(a) is the vacuum edge iota value and a is the plasma minor radius, respectively. A strong dependence of the quality of the H-mode on the edge topology conditions was revealed. The energy confinement time for the separatrix discharge plasmas was found to be enhanced beyond the normal ISS95 scaling in the transient H-mode phase, being 50% longer than that in the “before transition” phase. The window characteristics are discussed on the basis of the calculated geometrical poloidal viscous damping rate coefficient in a collisional plasma, indicating that the behavior of the viscous damping rate coefficient alone could not explain the observed characteristics. The bootstrap current properties of ECH plasmas and the relevant electron cyclotron current drive experimental results are also discussed.


Applications of Radio-Frequency Power to Plasmas: 7th Topical Conference | 1987

ICRF heating of currentless plasma in heliotron E

T. Mutoh; Hiroyuki Okada; O. Motojima; Y. Nakamura; M. Sato; H. Zushi; K. Kondo; Nobuaki Noda; H. Kaneko; T. Mizuuchi; F. Sano; S. Sudo; Y. Takeiri; K. Akaishi; T. Kawabata; Y. Ijiri; K. Itoh; S. Morimoto; A. Iiyoshi; K. Uo

Fast-wave and slow-heatings have been performed to study the heating properties, and to study the confinement properties of plasmas in a rare collisional regime. For the fast-wave (minority) heating, ion temperature increased from 200 eV to 650 eV at an electron density of 2.2 x 10/sup 19/ m/sup -3/ at an ICRF power of 1.5 MW. With the carbonization of the vacuum chamber, the ICRF pulse became able to sustain the plasma for 100 msec without ECH pulse. For the slow-wave (Ion Cyclotron Wave) heating, T/sub i/ increased up to 1.e keV at n-bar/sub 6/ of 0.6 x 10/sup 19/ m/sup -3/. The ion heating strongly depended on the electron density and better ion energy confinement was observed at high electron temperature region. These results were consistent with the calculation of the ambipolar neoclassical diffusion in the rare collisional regime. This high T/sub i/ and T/sub e/ plasma condition possibly corresponds to the electron root with a positive radial electric field E/sub r/.


Fusion Science and Technology | 2006

Configuration Control for the Confinement Improvement in Heliotron J

T. Mizuuchi; F. Sano; K. Nagasaki; Hiroyuki Okada; S. Kobayashi; K. Hanatani; Y. Torii; Y. Ijiri; T. Senju; K. Yaguchi; K. Sakamoto; K. Toshi; M. Shibano; K. Kondo; Y. Nakamura; M. Kaneko; Hajime Arimoto; G. Motojima; S. Fujikawa; H. Kitagawa; H. Nakamura; T. Tsuji; M. Uno; Shinya Watanabe; H. Yabutani; S. Matsuoka; M. Nosaku; N. Watanabe; S. Yamamoto; K.Y. Watanabe

Abstract In the helical-axis heliotron configuration, bumpiness of the Fourier components in Boozer coordinates is introduced to control the neoclassical transport. The bumpiness helps not only to align the mod-Bmin contours with the magnetic flux surfaces but also to control the balance of bootstrap currents due to helical and toroidal ripples. Effects of bumpiness control on the plasma performance (noninductive currents, fast-ion behavior, and global energy confinement) have been investigated in Heliotron J by selecting three configurations with different bumpiness ([curly epsilon]b = B04/B00 = 0.01, 0.06, and 0.15 at ρ = 2/3) but almost the same edge rotational transform and plasma volume. The dependence of noninductive toroidal currents is qualitatively consistent with the neoclassical prediction for the bootstrap current. The high-bumpiness configuration seems to be preferable for the confinement of fast ions. However, the longer global energy confinement time is not observed in the highest-bumpiness configuration ([curly epsilon]b = 0.15). When the dependence of the effective ripple modulation amplitude in International Stellarator Scaling 04 scaling is examined, the experimental results show that the normalized global energy confinement time seems long in the configuration with the minimum effective ripple modulation amplitude, where [curly epsilon]b is 0.06.


Journal of Nuclear Materials | 1989

Study on edge plasma physics and particle control in the Heliotron-E device

Hideki Minagawa; S. Kato; H. Oyama; Hirotaka Toyoda; K. Okazaki; H. Amemiya; Susumu Amemiya; Tomoaki Hino; Toshiro Yamashina; Y. Sakamoto; Hideo Sugai; D. L. Hillis; T. Mizuuchi; T. Obiki; N. Noda; H. Matsuura; K. Kondo; Kenya Akaishi; O. Motojima; H. Kaneko; H. Zushi; Y. Takeiri; M. Sato; F. Sano; T. Mutoh; M. Nakasuga; M. Harada; Hiroyuki Okada; S. Sudo; I. Otake

The edge plasma physics and the particle control under the intrinsic magnetic limiter configuration of a helical system have been studied with the Heliotron-E device, where currentless plasmas of Te ≤ 1–2 keV, Ti ≤ 1 keV and ne ≤ 2 × 1020/m3 are produced by a combination of ECRH, NBI and/or ICRH. It is indicated that the separatrix region of the heliotron device is able to act as a divertor magnetic field. According to calculations of the magnetic field line in the edge region, the separatrix region has some different characteristics from the scrape-off layer in tokamak devices; the existence of a fine structure in the separatrix region and asymmetry of the region in toroidal and poloidal directions are observed. A localized pattern of the heat load on the first wall is experimentally observed. This agrees with the heat-load profile expected from the magnetic configuration and the distribution of the plasma in the edge region. A carbonization of the first wall is successfully applied to the Heliotron E device for reduction of metallic impurity contents. The heat load at the divertor trace decreased and that on the other part of the first wall increased in the high recycling conditions after the carbonization.


Journal of Nuclear Materials | 1989

Effects of carbon wall on the behavior of Heliotron-E plasmas

Nobuaki Noda; T. Mizuuchi; K. Akaishi; T. Senju; K. Kondo; H. Kaneko; O. Motojima; T. Baba; S. Besshou; Masahiko Sato; M. Iima; S. Kobayashi; F. Sano; Y. Takeiri; T. Kawabata; T. Mutoh; Hiroyuki Okada; S. Sudo; H. Zushi; K. Yaguchi; Y. Ijiri; I. Ohtake; M. Harada; H. Matsuura; S. Morimoto; T. Obiki; A. Iiyoshi; K. Uo; H. Minagawa; Tomoaki Hino

Abstract Carbonization was successfully applied to Heliotron-E. Iron-inpurity radiations were strongly reduced with the carbonized wall. Main impacts of the metal reduction on plasma behaviors are sustainment of stored energy during high power, long pulse heating by NBI, achievement of a quasi-steady discharge with a low helical field and high beta, and highest electron density with pellet injection in a quasi-steady state. Hydrogen recycling was very high with the carbonized wall and low density operation was impossible. Helium glow discharge was found to be effective to control the hydrogen recycling with a carbon-tiled wall.


Plasma Science & Technology | 2004

Plasma Confinement Characteristics in Heliotron J—Spontaneous Change of Plasma Confinement State

T. Mizuuchi; Hiroyuki Okada; K. Nagasaki; S. Kobayashi; S. Yamamoto; F. Sano; K. Kondo; K. Hanatani; M. Nakasuga; Y. Nakamura; Yasuhiro Suzuki; Y. Manabe; Hiroyuki Shidara; H. Kawazome; M. Kaneko; Y. Nishioka; Y. Ohno; T. Takamiya; Hidetoshi Yukimoto; Y. Fukagawa; Y. Morita; S. Nakazawa; S. Nishio; Koichi Takahashi; S Tuboi; Masaki Yamada; Keisuke Ohashi; Y. Ijiri; T. Senju; K. Yaguchi

Spontaneous transition of the plasma confinement mode was observed in the helical-axis heliotron device Heliotron J for three different plasma heating schemes, i.e. ECH-only, NBI-only and the combination of ECH and NBI. The transition seems to occur above a certain critical density. In addition to the confinement transition, a spontaneous shift of the hitting position of the divertor plasma flux on the wall was observed. This shift could be related with the change of the edge field topology caused by non-inductive toroidal currents.

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