Ontology type: schema:ScholarlyArticle
2015-09
AUTHORSS. V. Shchepetov, Yu. V. Khol’nov, D. G. Vasil’kov
ABSTRACTThe behavior of plasma with a negative current in the range of 5 kA ≤ |J| ≤ 16 kA in the L-2M stellarator is studied. Plasma is created and heated by means of electron cyclotron resonance heating (ECRH). Here, the definition “negative” stands for a toroidal current directed in such a way that it reduces the initial rotational transform µ in absolute value. It is shown that, only at relatively small values of the negative current (|J| ~ 6 kA), the increase in the shear leads to a reduction in electromagnetic turbulence. As |J| rises, the average level of magnetic fluctuations in the stationary phase of the discharge gradually increases. After ECRH is switched off (i.e., when plasma cools down), there is a time interval in which the amplitude of magnetic field fluctuations increases. No coherent three-dimensional modes (e.g., double tearing modes) that could accompany the penetration of the current into the plasma were observed. As for axisymmetric perturbations with m ≠ 0, analysis of the experimental data shows that they are absent at |J| ≤ 8 kA, appear in some discharges at |J| = 9 kA, and are observed in each discharge at |J| ≥ 10 kA. The frequency of these oscillations is on the order of 10 kHz, the poloidal mode number is m = 2, and the duration is 4–6 ms. The absence of oscillations with m = 1 and the small value of the external magnetic field for the m = 2 perturbation indicate that the radial size of the magnetic island is less than 1 cm. This, in turn, suggests that the radial profile of the plasma current changes with increasing |J|. More... »
PAGES696-704
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