Effect of vacuum chamber boronization on the plasma parameters in the L-2M stellarator

Meshcheryakov, A. I.; Akulina, D. K.; Batanov, G. M.; Berezhetskiǐ, M. S.; Voronov, G. S.; Gladkov, G. A.; Grebenshchikov, S. E.; Grinchuk, V. A.; Grishina, I. A.; Колик, Л. В.; Larionova, N. F.; Летунов, А. А.; Logvinenko, V. P.; Petrov, A. E.; Pshenichnikov, A. F.; Ryabenko, G. A.; Sarksyan, K. A.; Скворцова, Н. Н.; Fedyanin, O.I.; Kharchev, Ν. K.; Khol'nov, Yu.V.; Шарапов, В. Н.

doi:10.1134/1.1947330

Cited by 31 publications

(9 citation statements)

References 5 publications

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“…Preparation of the vacuum chamber includes long term baking at a temperature of about 200°С, cleaning by an inductive discharge in the residual gas during pumping out, cleaning in a glow discharge in helium at a pressure of ~1 Pa, and boronization of the vacuum chamber wall [6]. After the latter procedure, the impu rity content in the wall is reduced to a level at which the rate of particle supply due to recycling is lower than the rate of particle loss.…”

Section: Measurements and Monitoring Of The Hydrogen And Deuteriummentioning

confidence: 99%

Measurements and monitoring of the hydrogen and deuterium contents in the plasma of the L-2M stellarator

Voronov

Berezhetskiǐ

2012

Plasma Phys. Rep.

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Section: Measurements and Monitoring Of The Hydrogen And Deuteriummentioning

confidence: 99%

Measurements and monitoring of the hydrogen and deuterium contents in the plasma of the L-2M stellarator

Voronov

Berezhetskiǐ

2012

Plasma Phys. Rep.

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“…Turbulent particle fluxes were measured in the edge plasma of the L-2M stellarator [34] with the use of a set of three Langmuir probes. It is well known that the flux Γj is defined as, Γj = δn j δv r j , j = 1 .…”

Section: Approximation Of Turbulent Particle Fluxesmentioning

confidence: 99%

Maximum likelihood algorithm for approximation of local fluctuational fluxes at the plasma periphery by fractional stable distributions

Saenko

2012

Preprint

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Statistical properties of a local fluctuational fluxes measured at the plasma edge are investigated in the work. It's shown that the amplitudes increments of the local fluctuational fluxes decrease by power law. For approximation of experimental PDFs the fractional stable distributions are used. The new algorithm of statistical estimation of the FSD parameters based on maximum likelihood method is described. By using of the algorithm the parameters of FSD are estimated by using experimental samples. It is shown good agreement between experimental and theoretical distributions. On the basis of this results the conclusion is made about applicability of the CTRW model for description of a processes underlying of the plasma turbulence.

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“…На стеллараторе Л-2М с 2002 г. также проводится боронизация стенок вакуумной камеры в тлею-щем разряде с применением карборана, позволившая значительно улучшить параметры разряда [3]. Так, после проведения боронизации стенок вакуумной камеры концентрация примесей кислорода и углерода в разряде уменьшилась в 3-5 раз, радиационные потери уменьшились в 2-3 раза и стали составлять всего 15-25% от вкладываемой энергии.…”

Section: Introductionunclassified

Deposition of Boron Films Under Ohmic Discharges in the L-2m Stellarator Using Metacarborane

Meshcheryakov¹,

Berezhetskij²,

Logvinenko³

et al. 2011

PAST-TF

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В работе приведены результаты экспериментальных исследований импульсной боронизации, проводимой в плазме омического разряда на стеллараторе Л-2М с применением карборана C 2 B 10 H 12 . Исследованы стойкость полученной бороуглеродной плёнки к распылению под действием потока плазмы омического разряда, динамика параметров плазмы в омическом разряде после нанесе-ния бороуглеродных плёнок. Показано, что импульсная боронизация позволяет наносить более плотное и прочное борокарбидное покрытие на стенки камеры стелларатора по сравнению с боронизацией в тлеющем разряде. При этом уменьшается рециклинг водорода со стенки камеры, а также количество примесей углерода и кислорода в водородной плазме омического разряда и соот-ветствующие радиационные потери. Исследованы также светорассеивающие свойства образцов с бороуглеродными плёнками.Ключевые слова: УТС, токамак, стелларатор, радиационные потери, поступление примесей в плазму, бороуглеродные плёнки, боронизация вакуумной камеры, омический нагрев плазмы. DEPOSITION OF BORON FILMS UNDER OHMIC DISCHARGES IN THE L-2M STELLARATOR USING METACARBORANE.A.I. MESHCHERYAKOV, M.S. BEREZHETSKIJ, V.P. LOGVINENKO, A.A. LETUNOV, O.I. BUZHINSKIJ, A.G. VOLOBOY. The results of experimental pulsed boronization are given in this paper. Boronization was carried out with carborane C 2 B 10 H 12 in plasma produced by ohmic discharges in the L-2M stellarator. We have tested the resistance of the obtained boron-carbon films with respect to their scattering under interaction with plasma of ohmic discharges. The dynamics of plasma parameters in the ohmic discharge after applying boron-carbon films was under study. It was shown that pulsed boronization produces more dense and durable boron-carbon coating on the walls of the stellarator chamber compared to boronization in a glow discharge. This significantly decreases the recycling of hydrogen from chamber walls as well as an amount of carbon and oxygen impurities in plasma of ohmic discharge and corresponding radiation losses. The light-scattering properties of the samples with boron-containing films were studied as well.

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Effect of vacuum chamber boronization on the plasma parameters in the L-2M stellarator

Cited by 31 publications

References 5 publications

Measurements and monitoring of the hydrogen and deuterium contents in the plasma of the L-2M stellarator

Measurements and monitoring of the hydrogen and deuterium contents in the plasma of the L-2M stellarator

Maximum likelihood algorithm for approximation of local fluctuational fluxes at the plasma periphery by fractional stable distributions

Deposition of Boron Films Under Ohmic Discharges in the L-2m Stellarator Using Metacarborane

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