RF plasma heating in the Uragan stellarator. I. Wave launching and plasma heating

Dikii, A. G.; Kalinichenko, S. S.; Калмыков, А. А.; Konovalov, I.I.; Ovchinnikov, S. S.; Pavlichenko, O. S.; Pashnev, V. K.; Slavnyi, A.S.; Suprunenko, V. A.; Тарасенко, В. Ф.; Tolok, V.T.; Швец, О. М.

doi:10.1088/0032-1028/18/8/001

Cited by 13 publications

(12 citation statements)

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“…According to Ref. [39], in these experiments a Nagoya type-I11 antenna was used that was equivalent to the Khar'kov frame type antennas employed in earlier experiments (1971( -1976. In contrast to these antennas, the Nagoya type-I11 antenna has an electrostatic screen that is used to diminish the poloidal component of the alternating electric field.…”

Section: Experiments On the Chs Torsatronmentioning

confidence: 99%

Analysis of ICRE ( _ci) plasma production in large scale tokamaks

et al. 1992

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The authors study the possibility of target plasma radiofrequency (RF) production in the ion cyclotron range of frequencies (ICRF) (ω ⩽ ωci) in large scale tokamaks before the startup of an Ohmic discharge. A number of experimental and theoretical studies on dense plasma production in the ICRF in toroidal magnetic devices are reviewed. The criteria for optimal development of the RF discharge stages are analysed, i.e., for RF breakdown of the neutral fill gas in the vicinity of the antenna (non-wave stage, ne << na, where ne and na are the densities of electrons and atoms), and the wave stages of initial ionization (ne < na) and neutral gas burnout (ne approximately na) in the whole volume of the plasma torus. A number of requirements for the design of the antenna system are formulated for all stages of dense plasma ICRF production. A scenario for plasma ICRF production with slot type antennas in the ITER tokamak is proposed. Numerical simulations with a 0-D transport code show that in ITER a target plasma with an electron density of approximately=3*1012 cm-3 can be produced by coupling 3-6 MW of RF power to the plasma at a frequency of approximately=3 MHz. Such a level of RF power is sufficient not only for full ionization of the neutral gas but also for heating the produced plasma to electron temperatures of approximately 80 eV

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Section: Experiments On the Chs Torsatronmentioning

confidence: 99%

Analysis of ICRE ( _ci) plasma production in large scale tokamaks

et al. 1992

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“…Longer RF pulses lead to a neutral-particle influx, which tends to constrict the" current channel and leads to MHD instabilities. In the Heliotron D, an RF coil similar to the Kharkov type [216,217] was used for ICRH in an Ohmically heated plasma. A heating efficiency of 10-20% was observed in the range of n e = 5 X 10 12 ~ 5 X 10 13 cm" 3 , which was in agreement with other experimental results [241,243].…”

Section: Ion Cyclotron Resonant Heating Ion-ion Hybrid Resonant Heatingmentioning

confidence: 99%

Recent stellarator research

Miyamoto

1978

Nucl. Fusion

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This paper intends to review recent stellarator research in various laboratories. Efforts are continuously and actively being made to improve the confinement of plasmas in stellarator fields. Advances in confinement theory are summarized. Experimental results concerning Ohmically heated plasmas as well as currentless plasmas are reviewed. Finally, stellarator reactor studies are briefly introduced.

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“…ICRF wave injection has been applied early in stellarators for plasma production and heating [3][4][5] and recently in tokamaks for plasma preionization [6]. The first applications of ICRF discharges for conditioning of the vacuum vessel were developed for the Uragan-3 torsatron in pulsed mode at low magnetic field (B < 0.5 kG) [5].…”

Section: Introductionmentioning

confidence: 99%

Physical and Electrical Properties of HfAlO_xFilms Prepared by Atomic Layer Deposition Using NH₃/Ar Plasma

Kawahara¹,

Torii²,

Ohji³

et al. 2004

Jpn. J. Appl. Phys.

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The use of a permanent magnetic field in superconducting magnetic fusion devices impedes conditioning by glow discharges as actually applied in most pulsed machines. An alternative has been studied in Tore Supra for this purpose with a 3.8 T permanent field: a discharge produced by ion cyclotron range of frequency wave injection (ICRF). Helium ICRF discharge conditioning (ICRF-DC) has already been shown to desaturate the deuterium-loaded carbon first wall efficiently. In this paper, we describe how D 2 ICRF-DC can be applied to clean the wall or change its hydrogen isotopic ratio. This is achieved by pumping wall-desorbed molecules induced by particle bombardment from the ICRF plasma. The conditioning efficiency is optimized as a function of two input parameters: the gas pressure and the applied power. A plasma characterization is also given as a function of these parameters and a global model has been used to compare the experimental results and to interpret the main processes to which the neutral and charged species are subjected. The key to optimizing ICRF-DC is the wave ion heating to produce energetic particle bombardment of the first wall, while still achieving a low electron density, low-temperature plasma (n e 10 17 m −3 , T e < 6 eV) to avoid reionization and redeposition of wall-desorbed neutrals before they can be evacuated by the torus pumping system. † Permanent address: Asociacion Euratom-Ciemat, Av. Complutense 22,

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RF plasma heating in the Uragan stellarator. I. Wave launching and plasma heating

Cited by 13 publications

References 0 publications

Analysis of ICRE ( _ci) plasma production in large scale tokamaks

Analysis of ICRE ( _ci) plasma production in large scale tokamaks

Recent stellarator research

Physical and Electrical Properties of HfAlO_xFilms Prepared by Atomic Layer Deposition Using NH₃/Ar Plasma

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RF plasma heating in the Uragan stellarator. I. Wave launching and plasma heating

Cited by 13 publications

References 0 publications

Analysis of ICRE ( ci) plasma production in large scale tokamaks

Analysis of ICRE ( ci) plasma production in large scale tokamaks

Recent stellarator research

Physical and Electrical Properties of HfAlOxFilms Prepared by Atomic Layer Deposition Using NH3/Ar Plasma

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Product

Resources

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Analysis of ICRE ( _ci) plasma production in large scale tokamaks

Analysis of ICRE ( _ci) plasma production in large scale tokamaks

Physical and Electrical Properties of HfAlO_xFilms Prepared by Atomic Layer Deposition Using NH₃/Ar Plasma