Stellarators

Pavlichenko, O. S.

doi:10.1088/0029-5515/32/1/414

Cited by 11 publications

(11 citation statements)

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“…ICRF heating experiments have been successfully done in helical systems [1][2][3][4][5][6][7] and have demonstrated the effectiveness of this heating method in three-dimensional (3D) magnetic configurations. In the Large Helical Device (LHD), significant performances of this method have also been demonstrated [8][9][10][11] and up to 500 keV of energetic tail ions have been observed by fast neutral particle analysis (NPA) [12,13].…”

Section: Introductionmentioning

confidence: 99%

A global simulation study of ICRF heating in the LHD

et al. 2006

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ICRF heating in the Large Helical Device is studied applying two global simulation codes; a drift kinetic equation solver, GNET, and a wave field solver, TASK/WM. Characteristics of energetic ion distributions in the phase space are investigated changing the resonance heating position; i.e. the on-axis and off-axis heating cases. A clear peak of the energetic ion distribution can be seen in the off-axis heating case because of the stable orbit of resonant energetic ions. The simulation results are also compared with experimental results evaluating the count number of the neutral particle analyzer and a relatively good agreement is obtained.

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Section: Introductionmentioning

confidence: 99%

A global simulation study of ICRF heating in the LHD

et al. 2006

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“…Recent experiments with ICRF heating in helical systems [1][2][3][4][5][6][7] have demonstrated the effectiveness of this heating method in non-axisymmetric configurations. Especially the successes of long term operations [5,6] have shown the importance of ICRF heating for future steady state operations in helical systems.…”

Section: Introductionmentioning

confidence: 99%

Effect of energetic ion loss on ICRF heating efficiency and energy confinement time in heliotrons

et al. 1999

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The ICRF heating efficiency and the global energy confinement time during ICRF heating are investigated, including the effect of energetic ion loss in heliotrons. The approximate formula of ICRF heating efficiency is derived using results based on Monte Carlo simulations (Murakami, S., et al., Fusion Eng. Des. 26 (1995) 209). The global energy confinement time including the energetic ion effect can be expressed in heliotrons in terms of ICRF heating power, plasma density and magnetic field strength. Results in plasmas at CHS show a systematic decrease of the global energy confinement time due to energetic ion loss from the assumed energy confinement scaling law, which is consistent with the experimental observations. The model is also applied to ICRF minority heating in LHD plasmas in two cases of typical magnetic configurations. A clear increase of the global energy confinement time due to the stored energy of energetic tail ions is obtained in the `orbit improved' configuration, while a decrease is observed in the `standard' configuration.

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“…Since the start of the helical confinement research, ICRF heating has a long history. To establish it as a reliable heating scheme in a helical system, there have been many applications on Heliotron-E [10], L-2 [11], ATF [12], CHS [13] and W7-AS [14], etc. In these devices, various wave-heating modes have been tested: slow-wave (ion cyclotron wave), fastwave (mode conversion heating, minority-ion heating, secondharmonic heating), and ion Bernstein wave, etc.…”

Section: Introductionmentioning

confidence: 99%

Ion cyclotron range of frequencies heating and high-energy particle production in the Large Helical Device

Mutoh¹,

Kumazawa²,

Seki³

et al. 2003

Nucl. Fusion

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Significant progress has been made with ion cyclotron range of frequencies (ICRF) heating in the Large Helical Device. This is mainly due to better confinement of the helically trapped particles and less accumulation of impurities in the region of the plasma core. During the past two years, ICRF heating power has been increased from 1.35 to 2.7 MW. Various wave-mode tests were carried out using minority-ion heating, second-harmonic heating, slow-wave heating and high-density fast-wave heating at the fundamental cyclotron frequency. This fundamental heating mode extended the plasma density range of effective ICRF heating to a value of 1×1020 m−3. This use of the heating mode was its first successful application in large fusion devices. Using the minority-ion mode gave the best performance, and the stored energy reached 240 kJ using ICRF alone. This was obtained for the inward-shifted magnetic axis configuration. The improvement associated with the axis-shift was common for both bulk plasma and highly accelerated particles. For the minority-ion mode, high-energy ions up to 500 keV were observed by concentrating the heating power near the plasma axis. The confinement properties of high-energy particles were studied for different magnetic axis configurations, using the power-modulation technique. It confirmed that with the inward-shifted configuration the confinement of high-energy particles was better than with the normal configuration. By increasing the distance of the plasma to the vessel wall to about 2 cm, the impurity influx was sufficiently reduced to allow sustainment of the plasma with ICRF heating alone for more than 2 min.

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Stellarators

Abstract: Report on the 8th International Workshop, IAEA Technical Committee Meeting held at Khar'kov, Union of Soviet Socialist Republics, 27-31 May 1991.

Cited by 11 publications

References 0 publications

A global simulation study of ICRF heating in the LHD

A global simulation study of ICRF heating in the LHD

Effect of energetic ion loss on ICRF heating efficiency and energy confinement time in heliotrons

Ion cyclotron range of frequencies heating and high-energy particle production in the Large Helical Device

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