Magnetic divertor design in GAMMA10 central cell

Katanuma, I.; Sasagawa, Y.; Tatematsu, Y.; Nakashima, Y.; Cho, T.; Пастухов, В. П.

doi:10.1088/0029-5515/46/5/011

Cited by 24 publications

(14 citation statements)

References 25 publications

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“…The first plan is to install the divertor coils in the central cell. 19 However, in the recent design, one anchor minimum-B magnetic field is to be replaced by a divertor magnetic field, which is plotted in Fig. 9.…”

Section: Flute-mode Fluctuations In the Gamma10 With Divertormentioning

confidence: 99%

“…This is to make a divertor magnetic field inside the GAMMA10 where the case of central cell divertor design was carried out by taking into account the plasma equilibrium. 19 Historically the equilibrium calculation has been carried out in various divertor mirror cells for isotropic pressure plasma, 20 for anisotropic pressure plasma 19,21 and for kinetic KruskalOberman stability theory with anisotropic pressure. 22 The theoretical study of flute mode stability by a magnetic divertor was done first by Lane et al 23 The subsequently the theory was extended by Pastukhov and Sokolov 24 by taking into account the nonparaxial magnetic filed line curvature and then was extended further more by Sasagawa et al 25 by including the anisotropic ion temperature effects.…”

Section: Introductionmentioning

confidence: 99%

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Flute mode fluctuations in the divertor mirror cell

et al. 2010

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The computer code by reduced magnetohydrodynamic equations were made which can simulate the flute interchange modes ͑similar to the Rayleigh-Taylor instability͒ and the instability associated with the presence of nonuniform plasma flows ͑similar to the Kelvin-Helmholtz instability͒. This code is applied to a model divertor and the GAMMA10 ͓M. Inutake et al., Phys. Rev. Lett. 55, 939 ͑1985͔͒ with divertor in order to investigate the flute modes in these divertor cells. The linear growth rate of the flute instability determined by the nonlocal linear analysis agrees with that in the linear phase of the simulations. There is a stable nonlinear steady state in both divertor cells, but the nonlinear steady state is different between the model divertor and the GAMMA10 with divertor.

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Section: Flute-mode Fluctuations In the Gamma10 With Divertormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Flute mode fluctuations in the divertor mirror cell

et al. 2010

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“…2πψ gives the magnetic flux inside a surface of ψ = const, and ϕ corresponds to an angular coordinate. The remaining coordinate ζ is taken as the z-axis or along magnetic field lines [8,9]. The classical viscosity is included in Eqs.…”

Section: Basic Equationsmentioning

confidence: 99%

Role of Flute Modes in the GAMMA10 Tandem Mirror

Katanuma

Yagi

Ichioka

et al. 2010

Plasma and Fusion Research

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The steady state in the GAMMA10 tandem mirror, in which radial transport due to flute mode turbulence is balanced by plasma heating and production, is investigated. The basic equations used here exclude the Alfvén and acoustic modes, which are unnecessary for transport due to the flute modes. The basic equations can be applied to the magnetic divertor if the system is assumed to be axisymmetric. High-pressure effects in non-axisymmetric magnetic fields in GAMMA10 are taken into the magnetic specific volume. Numerical calculation is performed to investigate the transport process due to flute mode fluctuations. Mild plasma heating with production leads the system to a steady state, whereas strong heating with production leads the system into sawtooth-like oscillation due to strong flute mode turbulence.

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“…Для обеспечения МГД-устойчивости открытых ловушек были предложены и эксперименталь-но исследованы [6][7][8] конфигурации магнитного поля с тороидальным дивертором. Сепаратриса дивер-тора также служит «нематериальной стенкой» и может влиять на параметры и пространственные рас-пределения плазменных потоков.…”

Section: Introductionunclassified

Experimental Investigation of Plasma Flows From Open Trap With the Toroidal Divertor Under Ecr Discharge

Berezkin¹,

Bragin²,

Zhil'tsov³

et al. 2014

PAST-TF

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Представлены результаты экспериментальных исследований плазменных потоков, вытекающих из открытой ловушки с торои-дальным дивертором. Холодная плазма создавалась при вводе микроволновой мощности в условиях электронного циклотрон-ного резонанса (ЭЦР). Излучение по волноводу через вакуумноплотное керамическое окно вводилось поперёк оси установ-ки. С помощью ленгмюровских зондов измерены пространственные распределения параметров плазмы. Максимальная плот-ность была ограничена критической плотностью n c (~10 12 см -3 ) для используемой частоты генератора. Обнаружено, что темпе-ратура и плотность плазмы в ловушке и вытекающих потоках практически не зависят от радиуса, когда зона ЭЦР находится в области удержания открытой ловушки, а плотность близка к n c . При плотности n < n c наблюдаются кольцевые плазменные структуры вблизи сепаратрисы, которые разрушались под действием низкочастотной неустойчивости. Обсуждаются возмож-ные механизмы появления структур и характера плазменных потоков.Ключевые слова: открытые ловушки, ЭЦР, тороидальный дивертор, плазменные потоки. EXPERIMENTAL INVESTIGATION OF PLASMA FLOWS FROM OPEN TRAP WITH THE TOROIDAL DIVERTOR UNDER ECR DISCHARGEThe results of the experimental studies of plasma flows escaping from the open trap with the toroidal divertor are presented. Cold plasma was produced introducing the microwave power in the presence of the electron cyclotron resonance (ECR). The radiation passed the waveguide through a ceramic vacuum-tight window being introduced across the axis of the device. By means of the Langmuir probes the spatial distribution of plasma parameters have been measured. The maximum density was limited by the critical density n c (~10 12 cm -3 ) for the used generator frequency. It has been found that the temperature and density of trapped and escaping flows practically do not depend on the radius when the ECR zone is located near the open trap confinement region and density is closed to n c . At a density of n  n c plasma ring structures are observed near the separatrix, which were disintegrating under the influence of the low-frequency shortwave instability. The possible mechanisms of the plasma structures occurrence and the plasma flows nature are discussed.Key words: open trap, ECR, toroidal divertor, plasma flows. ВВЕДЕНИЕСоздание потоков холодной плазмы при вводе микроволновой мощности в условиях электронного циклотронного резонанса (ЭЦР) широко применяется в микроэлектронике, обработке поверхностей, ион-ных источниках, в том числе многозарядных, плазменных ракетных двигателях [1]. Метод успешно при-меняется в системах разделения изотопов [2], имеется предложение использовать его в системах сепара-ции материалов [3], где ионы, вытекающие из источника, нагревались с помощью винтовых антенн. Есте-ственно, такие потоки с последующим нагревом ионов можно использовать и в плазменных двигателях большой мощности [4], где тяга создаётся при течении ионно-горячей плазмы через магнитное сопло.Отметим некоторые преимущества ЭЦР-метода создания плазмы. Метод является бесконт...

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Magnetic divertor design in GAMMA10 central cell

Cited by 24 publications

References 25 publications

Flute mode fluctuations in the divertor mirror cell

Flute mode fluctuations in the divertor mirror cell

Role of Flute Modes in the GAMMA10 Tandem Mirror

Experimental Investigation of Plasma Flows From Open Trap With the Toroidal Divertor Under Ecr Discharge

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