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- Title
Effect of the magnetic field structure on the intensity of electron cyclotron emission from the plasma of the L-2M stellarator.
- Authors
Akulina, D. K.; Gladkov, G. A.; Grebenshchikov, S. E.; Fedyanin, O. I.; Shchepetov, S. V.
- Abstract
Results are presented from experimental studies of the influence of the stellarator magnetic field structure on the plasma behavior in electron-cyclotron resonance regimes with a high heating power per electron. The magnetic field structure was changed by varying the induction current I p from −14 to +14 kA. The plasma electrons were heated at the second harmonic of the electron gyrofrequency by an X-mode microwave beam with a power of P ∼ 200 kW, the average plasma density being in the range n e = (0.5–2) × 1013 cm−3. At I p = 0, the rotational transform varies from $$\rlap{--} \iota $$ (0) = 0.2 on the magnetic axis to 0.8 at the plasma boundary. At a positive current of I p = 13.5 kA, the rotational transform was $$\rlap{--} \iota $$ (0) = 0.8 on the axis and $$\rlap{--} \iota $$ ( a p) = 0.9 at the plasma boundary. Experiments with a positive current have shown that the radiative temperature first increases with current. When the current increases to I p = 11–14 kA, strong modulation appears in the electron cyclotron emission signals received from all the plasma radii, the emission spectrum changes, and the emission intensity decreases. At a negative current of I p = −(6.5–13.5) kA, the rotational transform vanishes at r/a p = 0.4–0.6. In this regime, the number of suprathermal electrons is reduced substantially and the emission intensity decreases at both low and high plasma densities.
- Subjects
MAGNETIC fields; PLASMA gases; TRAPPED-particle instabilities; PLASMA devices; ELECTRONS
- Publication
Plasma Physics Reports, 2006, Vol 32, Issue 6, p461
- ISSN
1063-780X
- Publication type
Article
- DOI
10.1134/S1063780X0606002X