High Performance of Neutral Beam Injectors for Extension of LHD Operational Regime

Takeiri, Y.; Kaneko, O.; Tsumori, K.; Osakabe, M.; Ikeda, K.; Nagaoka, K.; Nakano, H.; Asano, E.; Kondo, Tomoki; Sato, Mamoru; Shibuya, Masayuki; Komada, S.

doi:10.13182/fst10-a10834

Cited by 74 publications

(67 citation statements)

References 24 publications

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“…The total port-through power is 16 MW for the tangential NBIs and 12 MW for the perpendicular NBIs. 19 In this experiment, the combination of perpendicular NBIs and balanced tangential NBIs have been used for plasma heating without net driving force of toroidal flow. The co-directed force is caused by the difference of particle orbit between co-and counter-injected beam ions and charge-exchange loss even in the balanced NBI, and is confirmed by FIT-3D code 20 to be negligibly small in this experimental condition with high magnetic field.…”

Section: Methodsmentioning

confidence: 99%

3-D effects on viscosity and generation of toroidal and poloidal flows in LHD

Nagaoka¹,

Ida²,

Yoshinuma³

et al. 2013

Physics of Plasmas

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Three-dimensional effects on plasma flows have been experimentally studied in the large helical device with 3D configurations. Spontaneous toroidal flow without net driving force using the combination of perpendicular neutral beam injection (NBI) heating and balanced tangential NBI heating has been investigated with two magnetic configurations. Co-and counter-directed spontaneous flows have been observed depending on the collisionality. Toroidal flow shear changes the sign at 0:4 < r eff < 0:6 between co-and counter-flowing plasmas, where r eff is a averaged minor radius. The detailed flow structures have been also examined at the edge region with stochastic magnetic field.

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Section: Methodsmentioning

confidence: 99%

3-D effects on viscosity and generation of toroidal and poloidal flows in LHD

Nagaoka¹,

Ida²,

Yoshinuma³

et al. 2013

Physics of Plasmas

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“…In the experiment discussed below, the plasma was fuelled by hydrogen ice-pellet injection [23], and heated by negative-ionbased neutral beam (NB) injection of up to 180 keV beam energy [24]. The temperature and density profiles were measured by Thomson scattering [25].…”

Section: Methodsmentioning

confidence: 99%

Direct extrapolation of radial profile data to a self-ignited fusion reactor based on the gyro-Bohm model

Miyazawa

Goto

Morisaki

et al. 2011

Fusion Engineering and Design

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“…In LHD, the plasma was initiated by an electron cyclotron heating (ECH) [8] and heated additionally by a neutral beam injection (NBI) [9]. Here, hydrogen is used as a working gas.…”

Section: Experimental Apparatusmentioning

confidence: 99%

Creation of Impurity Source inside Plasmas with Various Types of Tracer-Encapsulated Solid Pellet

Tamura

Sudo

Suzuki

et al. 2015

Plasma and Fusion Research

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A Tracer-Encapsulated Solid Pellet (TESPEL) was developed for promoting an impurity transport study in a magnetically-confined plasma. One of the advantages of the TESPEL is that it can make a three-dimensionally localized impurity source in the plasma. This enables us to inject the tracer impurity inside or in the vicinity of the region of interest. Recently, a new-type TESPEL with a thinner outer shell has been developed in order to achieve a shallower deposition of the tracer impurity. With the TESPEL having the thinner shell, we have achieved about 4 cm shallower deposition of the tracer impurity, compared with the case of the conventional thick-shell type TESPEL with the same outer diameter of about 700 µm. Moreover, for the achievement of the further shallower deposition of the tracer impurity, we also developed the TESPEL with a tracer-impurity-doped thin shell. After the injection of the TESPEL with the tracer-impurity-doped thin shell, the line emissions from the highly-ionized doped impurity are clearly observed with a vacuum ultraviolet spectrometer, which clearly demonstrates its ability to carry the impurity as a new tool.

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High Performance of Neutral Beam Injectors for Extension of LHD Operational Regime

Cited by 74 publications

References 24 publications

3-D effects on viscosity and generation of toroidal and poloidal flows in LHD

3-D effects on viscosity and generation of toroidal and poloidal flows in LHD

Direct extrapolation of radial profile data to a self-ignited fusion reactor based on the gyro-Bohm model

Creation of Impurity Source inside Plasmas with Various Types of Tracer-Encapsulated Solid Pellet

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