Neutral injection complex for the Globus-M spherical tokamak

Гусев, В. К.; Dech, A.V.; Esipov, L. A.; Минаев, В. Б.; Barsukov, A. G.; Igon'kina, G. B.; Kuznetsov, V. V.; Panasenkov, A. A.; Sokolov, M. M.; Tilinin, G. N.; Lupin, A. V.; Markov, V. K.

doi:10.1134/s1063784207090058

Cited by 22 publications

(11 citation statements)

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“…Глобус-М2 -компактный (большой радиус R=36 cm, малый радиус r = 24 cm, аспектное отношение A = 1.5) сферический токамак [14,15], который является модернизированной версией токамака Глобус-М [15,16]. Установка Глобус-М2 оборудована двумя [17,18] инжекторами атомов высокой энергии мощностью до 1 MW и энергией инжекции до 30 и 50 keV соответственно. В состав диагностического комплекса токамака входят два анализатора атомов перезарядки (NPA): ACORD-12 и ACORD-24M [19].…”

Section: эксперимент на токамаке глобус-м2unclassified

Анализ Потерь Быстрых Ионов, Вызванных Распространением Тороидальных Альфвеновских Мод В Плазме Сферического Токамака Глобус-М2

Балаченков¹,

Бахарев²,

Варфоломеев³

et al. 2022

Журнал Технической Физики

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With an increase of magnetic field up to 0.8 T and plasma current to 400 kA, fast ion losses rate in the discharges with toroidal Alfven eigenmodes decreased in tokamak Globus-M2 comparing with Globus-M tokamak discharges. Taking into account the data on the discharges with increased magnetic field and plasma current, the regression fit of neutral particle analyzer flux drop in energy channel close to neutral beam energy on relative eigenmode magnitude, the value of magnetic field and plasma current was analyzed. The power of flux drop dependence on TAE magnitude was found to be ~0.5 and inverse proportional on the value of product of magnetic field and plasma current, which is highly likely is determined only by plasma current due to weak dependence on magnetic field. The result obtained indicates that fast ion losses in Globus-M2, stimulated by toroidal Alfven eigenmodes are mostly determined by the shift of passing orbits to the plasma edge. With the increase of plasma current and magnetic field, neutron flux drops arising in the moments of toroidal mode bursts have also decreased.

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Section: эксперимент на токамаке глобус-м2unclassified

Анализ Потерь Быстрых Ионов, Вызванных Распространением Тороидальных Альфвеновских Мод В Плазме Сферического Токамака Глобус-М2

Балаченков¹,

Бахарев²,

Варфоломеев³

et al. 2022

Журнал Технической Физики

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“…Hydrogen and deuterium beams were injected (the NBI complex (Gusev et al. 2007) was implemented on the tokamak). The NBI started 10–15 ms after the plasma current start-up and continued for 30–40 ms.…”

Section: Experimental Set-up and Main Techniquesmentioning

confidence: 99%

Effect of toroidal Alfvén eigenmodes on fast particle confinement in the spherical tokamak Globus-M

et al. 2015

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In experiments with neutral beam injection at the early stage of a Globus-M discharge, instabilities were observed that were excited by fast ions in the frequency range of 50–200 kHz, which were identified as toroidal Alfvén eigenmodes (TAE) (Petrov et al., Plasma Phys. Rep., vol. 37, 2011, pp. 1001–1005). In contradiction with the NSTX and MAST tokamaks, a regime of TAE generation was realized with strongly developed single modes. Magnetic measurements with fast Mirnov probes have shown that most of the modes have toroidal number $n=1$. The influence of the modes on the fast particle confinement was recorded by means of a tangentially directed neutral particle analyser (NPA) and neutron detector. Hydrogen and deuterium were used as target plasma and injected beam for study of the isotopic effect. At deuterium injection into the deuterium plasma, TAE led to the neutron rate dropping by 25 %, whereas NPA fluxes of high energy dropped by 75 %. At hydrogen injection, the drop in the measured NPA fluxes did not exceed 25 %.

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“…Experiments on plasma heating by high-energy neutral beams in the Globus-M tokamak began in late 2002, when the IPM-2 ion source was mounted on the injector [19,32]. The ion source generates hydrogen and deuterium neutral beams with energies of up to 30 keV and powers of up to 0.6 MW.…”

Section: Experimental Studies Of Nbi Plasma Heatingmentioning

confidence: 99%

“…The main parameters of these tokamaks are listed in the table. The NBI heating system of Globus-M was described in detail in [19].…”

Section: Introductionmentioning

confidence: 99%

10.1007/s11452-008-2001-9

2010

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Results from experimental studies on the injection of high-energy neutral hydrogen beams into the plasma of the Globus-M spherical tokamak are reviewed. In the Introduction, the importance of these studies for implementing the controlled fusion research program and constructing the ITER tokamak is proved. Some problems related to the use of neutral beam injection in small and low-aspect-ratio tokamaks is analyzed. Results are presented from numerical simulations of the experiment by using the ASTRA transport code. It is shown that the use of neutral beam injection in the Globus-M tokamak ensures efficient ion heating and increases the plasma stored energy. The greater part of the review is devoted to the survey of experiments on the injection of 22-to 30-keV hydrogen and deuterium beams with a power of 0.4-0.8 MW into the plasma of the Globus-M spherical tokamak in a wide range of plasma currents and densities. The experimental results are analyzed and compared with the results of numerical simulations. The achievement of top plasma parameters is highlighted.

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Neutral injection complex for the Globus-M spherical tokamak

Cited by 22 publications

References 0 publications

Анализ Потерь Быстрых Ионов, Вызванных Распространением Тороидальных Альфвеновских Мод В Плазме Сферического Токамака Глобус-М2

Анализ Потерь Быстрых Ионов, Вызванных Распространением Тороидальных Альфвеновских Мод В Плазме Сферического Токамака Глобус-М2

Effect of toroidal Alfvén eigenmodes on fast particle confinement in the spherical tokamak Globus-M

10.1007/s11452-008-2001-9

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