Effect of the transverse magnetic field on turbulence and parameters of a plasma column in the L-2M stellarator View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2000-01

AUTHORS

D. K. Akulina, G. M. Batanov, M. S. Berezhetskii, G. A. Gladkov, S. E. Grebenshchikov, I. S. Danilkin, L. M. Kovrizhnykh, L. V. Kolik, A. B. Kuznetsov, N. F. Larionova, K. M. Likin, N. I. Malykh, A. I. Meshcheryakov, A. E. Petrov, K. A. Sarksyan, I. S. Sbitnikova, N. N. Skvortsova, O. I. Fedyanin, N. K. Kharchev, Yu. V. Khol'nov, S. V. Shchepetov

ABSTRACT

The influence of magnetic configurations with magnetic hills or wells on the parameters of a plasma column and turbulence characteristics were studied in experiments in which the plasma was created and heated by a microwave beam at the second harmonic of the electron cyclotron frequency. Calculations show that, for 〈β〉=(1.5−2)×10−, a configuration with a magnetic well takes place and the Mercier criterion for stability of the ideal MHD modes is satisfied. It is shown that the compensation of the Shafranov shift of the plasma column by a transverse (vertical) field (Bv/B0=5×10−3) leads to a configuration with a magnetic hill in which the Mercier stability criterion is violated in the central region of the plasma column. It is experimentally shown that the stored plasma energy in the magnetic-hill configuration is reduced by one-half in comparison with the magnetic-well configuration. In the case of a magnetic hill, the energy of fluctuations increases both in the plasma core and near the separatrix, and the quasi-regular components of the wavelet spectra grow. When the Shafranov shift is compensated only partially (Bv/B0∼3×10−3) and the system is near the instability threshold, the stored plasma energy and the central electron temperature are somewhat higher, and the radiation power of fast electrons from non-Maxwellian tails at the second harmonic of the electron gyrofrequency decreases. It is found that the wavelet spectra of fluctuations change, the coherence coefficient for spectral components increases, and the radial electric field near the separatrix decreases. More... »

PAGES

1-9

Identifiers

URI

http://scigraph.springernature.com/pub.10.1134/1.952816

DOI

http://dx.doi.org/10.1134/1.952816

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1050447144


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6 schema:description The influence of magnetic configurations with magnetic hills or wells on the parameters of a plasma column and turbulence characteristics were studied in experiments in which the plasma was created and heated by a microwave beam at the second harmonic of the electron cyclotron frequency. Calculations show that, for 〈β〉=(1.5−2)×10−, a configuration with a magnetic well takes place and the Mercier criterion for stability of the ideal MHD modes is satisfied. It is shown that the compensation of the Shafranov shift of the plasma column by a transverse (vertical) field (Bv/B0=5×10−3) leads to a configuration with a magnetic hill in which the Mercier stability criterion is violated in the central region of the plasma column. It is experimentally shown that the stored plasma energy in the magnetic-hill configuration is reduced by one-half in comparison with the magnetic-well configuration. In the case of a magnetic hill, the energy of fluctuations increases both in the plasma core and near the separatrix, and the quasi-regular components of the wavelet spectra grow. When the Shafranov shift is compensated only partially (Bv/B0∼3×10−3) and the system is near the instability threshold, the stored plasma energy and the central electron temperature are somewhat higher, and the radiation power of fast electrons from non-Maxwellian tails at the second harmonic of the electron gyrofrequency decreases. It is found that the wavelet spectra of fluctuations change, the coherence coefficient for spectral components increases, and the radial electric field near the separatrix decreases.
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13 schema:keywords Hill
14 L-2M stellarator
15 M stellarator
16 MHD modes
17 Mercier criterion
18 Mercier stability criterion
19 Shafranov shift
20 beam
21 calculations
22 cases
23 central electron temperature
24 central region
25 characteristics
26 coefficient
27 coherence coefficient
28 column
29 comparison
30 compensation
31 component increases
32 components
33 configuration
34 core
35 criteria
36 cyclotron frequency
37 effect
38 electric field
39 electron cyclotron frequency
40 electron gyrofrequency
41 electron temperature
42 electrons
43 energy
44 energy of fluctuations
45 experiments
46 fast electrons
47 field
48 fluctuations
49 frequency
50 gyrofrequency
51 harmonics
52 ideal MHD modes
53 increase
54 influence
55 instability threshold
56 magnetic configuration
57 magnetic field
58 magnetic hill
59 magnetic well
60 magnetic-hill configuration
61 magnetic-well configuration
62 microwave beam
63 mode
64 non-Maxwellian tails
65 one-half
66 parameters
67 place
68 plasma
69 plasma column
70 plasma core
71 plasma energy
72 power
73 quasi-regular components
74 radial electric field
75 radiation power
76 region
77 second harmonic
78 separatrix
79 shift
80 spectra
81 spectral components increases
82 stability
83 stability criterion
84 stellarator
85 system
86 tail
87 temperature
88 threshold
89 transverse field
90 transverse magnetic field
91 turbulence
92 turbulence characteristics
93 wavelet spectrum
94 wells
95 schema:name Effect of the transverse magnetic field on turbulence and parameters of a plasma column in the L-2M stellarator
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