Divertor simulation experiment and its future research plan making use of a large tandem mirror device

Nakashima, Y.; Takeda, H.; Hosoi, K.; Yonenaga, R.; Katanuma, I.; Ichimura, Kazuya; Ichimura, M.; Imai, T.; Ishii, Takashi; Kariya, T.; Kiwamoto, Y.; Minami, R.; Miyata, Yasumitsu; Ozawa, H.; Satō, Hiroyuki; Yamaguchi, Yuusuke; Yoshikawa, Masayuki; Asakura, N.; Hatayama, A.; Higashizono, Y.; Kado, S.; Masuzaki, S.; Nishino, Norikazu; Ohno, Noriyasu; Ueda, Y.

doi:10.1016/j.jnucmat.2010.11.081

Cited by 35 publications

(10 citation statements)

References 13 publications

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“…Typically, the radial profile of the heat flux density measured with the calorimeter had the peak on axis [6]. The peak heat-flux of 17 MW/m 2 on the axis was obtained by using a movable calorimeter during the P-ECH injection.…”

Section: Resultsmentioning

confidence: 99%

Development of new mirror antenna for generation of high intermittent heat flux in GAMMA 10 tandem mirror

Minami¹,

Imai²,

Kariya³

et al. 2016

AIP Conference Proceedings

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Abstract. Electron cyclotron heating (ECH) power modulation experiments in GAMMA 10 tandem mirror have been carried out in order to generate and control the high heat flux and to make the ELM (edge localized mode) like intermittent heat load pattern for divertor simulation studies. The maximum energy density obtained by the use of present mirror antenna systems is about 0.08 MJ/m 2 and is still far lower than that of ITER ELM. To achieve the generation of higher heat flux, the development of a new mirror antenna has carried out in order to concentrate the heating power on the axis. The calculated e-folding radius of power density has been improved from 63 mm for the present mirror to 40 mm for the new mirror antenna.

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Section: Resultsmentioning

confidence: 99%

Development of new mirror antenna for generation of high intermittent heat flux in GAMMA 10 tandem mirror

Minami¹,

Imai²,

Kariya³

et al. 2016

AIP Conference Proceedings

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“…Considerable energy transport along the magnetic field line due to the AIC waves is suggested theoretically [6]. Recently, a divertor simulation study using end loss ions has been started in the GAMMA 10 tandem mirror [7]. Mirror-confined hot plasmas with ion temperature around 0.5 keV are transported along the magnetic field line in the standard operation.…”

Section: Ex/p6-20mentioning

confidence: 99%

Coupling of ICRF waves and axial transport of high-energy ions owing to spontaneously excited waves in the GAMMA 10 tandem mirror

Ikezoe¹,

Ichimura²,

Hirata³

et al. 2013

Nucl. Fusion

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Plasmas with high ion-temperature of several keV and strong temperature anisotropy of more than 10 have been produced by using ion-cyclotron range of frequency (ICRF) heating in the GAMMA 10 tandem mirror. In such high performance plasmas with strong anisotropy, high-frequency fluctuations, so-called Alfvén-Ion-Cyclotron (AIC) waves, are spontaneously excited. The AIC waves have several discrete peaks in the frequency spectrum. Couplings between ICRF waves for heating and excited AIC waves are clearly observed in the central cell of GAMMA 10. Low frequency waves which have differential frequencies between discrete peaks of the AIC waves are also observed. Parametric decay of ICRF waves are discussed and pitch angle scattering of high-energy ions owing to those low-frequency waves are clearly detected. Energy transport along the magnetic field line is one of the important subjects when the ICRF power is injected in the perpendicular direction to magnetic field line.

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“…In addi- tion, charge-exchange interaction, which is an ion intrinsic interaction, redistributes the spatial profiles of the neutral particles through momentum transfer. A large device that can produce reactor-relevant ion temperature and ion flux is one candidate to conduct experimental investigation [5]. However, a small linear machine with a radio-frequency (RF) plasma source is also promising because cylindrically wound RF antenna permits ion beam injection into the device.…”

Section: Introductionmentioning

confidence: 99%

Divertor Plasma Simulation Experiment Using Hydrogen Ionizing Plasma and Helium Ion Beam in an RF Plasma Source DT-ALPHA

Takahashi

Kobayashi

Boonyarittipong

et al. 2018

Plasma and Fusion Research

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A helium ion beam was injected into hydrogen ionizing plasma using a radio-frequency plasma source to study divertor plasma. Optical emissions from the hydrogen Balmer series and Fulcher-α band were collected. The emissions of the hydrogen Balmer series clearly increased following the onset of the ion beam injection. The behavior of excited hydrogen atoms slightly depend on its excitation energy. In addition to the Balmer series, the emission from hydrogen molecules increased under the existence of energetic ions. These results indicate that the energetic ion collision affects the population density of the excited hydrogen atoms and molecules.

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Divertor simulation experiment and its future research plan making use of a large tandem mirror device

Cited by 35 publications

References 13 publications

Development of new mirror antenna for generation of high intermittent heat flux in GAMMA 10 tandem mirror

Development of new mirror antenna for generation of high intermittent heat flux in GAMMA 10 tandem mirror

Coupling of ICRF waves and axial transport of high-energy ions owing to spontaneously excited waves in the GAMMA 10 tandem mirror

<b>Divertor Plasma Simulation Experiment Using Hydrogen Ionizing </b><b>Plasma and Helium Ion Beam in an RF Plasma Source </b><b>DT-ALPHA</b>

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