Reaction of turbulence at the edge and in the center of the plasma column to pulsed impurity injection caused by the sputtering of the wall coating in L-2M stellarator

G. M. Batanov; M. S. Berezhetskii; V. D. Borzosekov; D. G. Vasilkov; I. Yu. Vafin; S. E. Grebenshchikov; I. A. Grishina; L. V. Kolik; E. M. Konchekov; N. F. Larionova; A. A. Letunov; V. P. Logvinenko; D. V. Malakhov; A. I. Meshcheryakov; A. E. Petrov; K. A. Sarksian; N. N. Skvortsova; V. D. Stepakhin; N. K. Kharchev; A. A. Kharchevskii; Yu. V. Kholnov; S. V. Shchepetov

doi:10.1134/S1063780X17080049

Reaction of turbulence at the edge and in the center of the plasma column to pulsed impurity injection caused by the sputtering of the wall coating in L-2M stellarator

Authors: Batanov G.M.¹, Berezhetskii M.S.¹, Borzosekov V.D.¹^,2, Vasilkov D.G.¹^,3, Vafin I.Y.¹, Grebenshchikov S.E.¹, Grishina I.A.¹, Kolik L.V.¹, Konchekov E.M.¹^,2, Larionova N.F.¹, Letunov A.A.¹, Logvinenko V.P.¹, Malakhov D.V.¹^,2^,4, Meshcheryakov A.I.¹, Petrov A.E.¹^,2, Sarksian K.A.¹, Skvortsova N.N.¹^,4^,5, Stepakhin V.D.¹^,2, Kharchev N.K.¹, Kharchevskii A.A.¹, Kholnov Y.V.¹, Shchepetov S.V.¹
Affiliations:
1. Prokhorov General Physics Institute
2. Pirogov Russian National Research Medical University
3. Bauman Moscow State Technical University
4. Moscow Technological University
5. National Research Nuclear University “MEPhI,”
Issue: Vol 43, No 8 (2017)
Pages: 818-823
Section: Stellarators
URL: https://journal-vniispk.ru/1063-780X/article/view/186180
DOI: https://doi.org/10.1134/S1063780X17080049
ID: 186180

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Abstract

Impurity injection into plasma caused by the sputtering of the wall coating in the L-2M stellarator during auxiliary electron cyclotron resonance heating leads to a change in the level of plasma density fluctuations with frequencies above 0.25 MHz: suppression of long-wavelength (k_⊥ = 2 cm^–1) density fluctuations in the edge plasma, intensification of short-wavelength (k_⊥ = 30 cm^–1) and long-wavelength (k_⊥ = 1 cm^–1) fluctuations at the midradius of the plasma column, and intensification of short-wavelength fluctuations (k_⊥ = 20 cm^–1) in the plasma center (including the gyroresonance region). At the same time, the level of fluctuations with frequencies below 0.25 MHz remains unchanged. In the edge plasma, a decrease in the plasma potential and suppression of its fluctuations is observed during impurity injection, which also causes an increase in MHD activity.

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Reaction of turbulence at the edge and in the center of the plasma column to pulsed impurity injection caused by the sputtering of the wall coating in L-2M stellarator

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