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

After boronization of the vacuum chamber of the L-2M stellarator, radiative losses from ohmically and ECR heated plasmas were reduced by a factor of 3-4. Under these conditions, radiative losses in the ECRH regime comprise only 10-15% of the input microwave power. Some effects have been detected tha...

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Published inPlasma physics reports Vol. 31; no. 6; pp. 452 - 461
Main Authors Meshcheryakov, A. I., Akulina, D. K., Batanov, G. M., Berezhetskii, M. S., Voronov, G. S., Gladkov, G. A., Grebenshchikov, S. E., Grinchuk, V. A., Grishina, I. A., Kolik, L. V., Larionova, N. F., Letunov, A. A., Logvinenko, V. P., Petrov, A. E., Pshenichnikov, A. A., Ryabenko, G. A., Sarksyan, K. A., Skvortsova, N. N., Fedyanin, O. I., Kharchev, N. K., Khol’nov, Yu. V., Sharapov, V. M.
Format Journal Article
LanguageEnglish
Published United States 01.06.2005
Subjects
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ECR HEATING
ELECTRON CYCLOTRON-RESONANCE
ELECTRON TEMPERATURE
ENERGY LOSSES
GLOW DISCHARGES
ION TEMPERATURE
MICROWAVE RADIATION
PLASMA
PLASMA CONFINEMENT
RF SYSTEMS
STELLARATORS
TURBULENCE
WALL EFFECTS
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Summary:After boronization of the vacuum chamber of the L-2M stellarator, radiative losses from ohmically and ECR heated plasmas were reduced by a factor of 3-4. Under these conditions, radiative losses in the ECRH regime comprise only 10-15% of the input microwave power. Some effects have been detected that were not observed previously: a substantial increase in the gradient of the electron temperature near the separatrix, a preferentially outward-directed radial turbulent particle flux (both throughout the discharge phase and from shot to shot), and a longer (by a factor of 2-3) duration of the plasma cooling phase.
ISSN:1063-780X
1562-6938
DOI:10.1134/1.1947330