NDLI: Study of plasma confinement in the L-2M stellarator during the formation of an edge transport barrier

Content Provider	Springer Nature Link
Author	Vorov, G. S. Akulina, D. K. Batav, G. M. Berezhetskii, M. S. Vasil’kov, D. G. Vafin, I. Yu. Vorova, E. V. Grebenshchikov, S. E. Grishina, I. A. Kolik, L. V. Lariova, N. F. Logvinenko, V. P. Malakhov, D. V. Meshcheryakov, A. I. Nechaev, Yu. I. Petrov, A. E. Sarksyan, K. A. Saenko, V. V. Skvortsova, N. N. Fedyanin, O. I. Kharchev, N. K. Khol’v, Yu. V. Shchepetov, S. V.
Copyright Year	2010
Abstract	A plasma confinement mode characterized by the formation of an edge transport barrier (ETB) was discovered in the L-2M stellarator after boronization of the vacuum vessel wall. The transition into this mode is accompanied by a jump in the electron temperature by 100–200 eV at the plasma edge and a sharp increase in the gradient of the electron temperature T $_{e}$ in this region. The threshold power for the transition into the ETB confinement mode with an increased electron temperature gradient is P thr▿Te = (60 ± 15)n $_{e}$ [10$^{19}$ m$^{−3}$] kW. The formation of the ETB manifests itself also in a substantial change in the electron density profile. A density peak with a steep gradient at the outer side forms at the plasma edge. The threshold power for the transition into the ETB confinement mode corresponding to a substantial increase in the plasma density gradient near r = a is P thr▿Te = (67 ± 9)n $_{e}$ [10$^{19}$ m$^{−3}$] kW, which agrees to within experimental error with the threshold power for the transition into the ETB confinement mode determined from the sharp increase in the gradient of the electron temperature T $_{e}$. The value of P $_{thr}$ for the L-2M stellarator agrees to within 25% with that obtained from the tokamak scaling. In the ETB confinement mode, the plasma energy W and the energy confinement time τ$_{E}$ determined from diamagnetic measurements increase by 20–30% as compared to those obtained from the stellarator scaling for the confinement mode without an ETB. When the heating power increases by a factor of 2–3 above the threshold value, the effects related to improved energy confinement disappear.
Starting Page	551
Ending Page	557
Page Count	7
File Format	PDF
ISSN	1063780X
Journal	Plasma Physics Reports
Volume Number	36
Issue Number	7
e-ISSN	15626938
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2010-07-22
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Atomic, Molecular, Optical and Plasma Physics
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics

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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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