Global magnetohydrodynamic instabilities in the L-2M stellarator

Михайлов, М. И.; Shchepetov, S. V.; Nührenberg, C.; Nührenberg, J.

doi:10.1134/s1063780x15120107

Cited by 6 publications

(6 citation statements)

References 14 publications

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“…Peeling modes were also observed in experiments [11][12][13]. In all cases experiments [11][12][13] and calculations [6][7][8] were performed for classical stellarators.…”

Section: Introductionmentioning

confidence: 72%

“…The results of these experiments are consistent with the calcul ations of stability of the m/n = 5/4 peeling mode and its localization along the radius. External peeling mode was found in calculations [8]. Resistive interchange modes cannot be responsible for fast drop of plasma pressure; their growth rates are too low [12].…”

Section: Analytical Calculations and Brief Analysis Of Experimental O...mentioning

confidence: 84%

“…However, it is well known that higher modes may be stabilized due to finite ion Larmor radius effects. A simplest approximation yields: T n n eaB / / pi 0i 0i 0 0 0 is the ion diamagnetic drift angular frequency, T 0i is the ion temperature in energetic units, n 0 is the density, c is velocity of light, e is the elementary charge; prime defines differentiation with respect to a. MHD growth rate γ mhd ~ V A /R [8,19], therefore drift frequency will overcome it at certain m. The influence of finite ion Larmor radius effects on L2M plasma stability was considered in [12]. It was shown that poloidal mode number necessary to stabilize resistive interchanges is m ~ 15 [12].…”

Section: Analytical Calculations and Brief Analysis Of Experimental O...mentioning

confidence: 99%

“…Numerical and analytical calculations [8,13] show that the mode produces a moderate magnetic field in the vacuum region and it is not easy to identify it with local magnetic probes. Besides, the mode with given poloidal and toroidal numbers is very sensitive to plasma edge rotational transform value.…”

Section: Analytical Calculations and Brief Analysis Of Experimental O...mentioning

confidence: 99%

“…[5], for a review). It is necessary to mention that peeling modes for zero net current plasma were found numerically [6][7][8]. In all cases the numerical code CAS3D [9,10] was used.…”

Section: Introductionmentioning

confidence: 99%

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On plasma edge ideal MHD stability/instability condition in Mercier stable magnetic hill configurations

Shchepetov

2016

Plasma Phys. Control. Fusion

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The stability of peeling modes in zero net current stellarator plasma is studied in high poloidal mode number m 1 approximation. The vacuum region solution is taken into account. Under these conditions in Mercier stable magnetic hill plasmas internal peeling modes are stable. External peeling modes can be unstable, but several limitations on them are found. It is shown that an analytically derived pressure gradient threshold is in reasonable agreement with the experimental observations and numerical calculations. The threshold decreases with increasing poloidal mode number m. It is shown, however, that higher modes may be stabilized due to finite ion Larmor radius effects. For the sake of definiteness, we have investigated peeling mode behavior in Mercier unstable plasma. It is shown that both external and internal peeling modes can be unstable in this regime. However, external and internal peeling modes in this case are definitely different.

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“…Peeling modes were also observed in experiments [11][12][13]. In all cases experiments [11][12][13] and calculations [6][7][8] were performed for classical stellarators.…”

Section: Introductionmentioning

confidence: 72%

Section: Analytical Calculations and Brief Analysis Of Experimental O...mentioning

confidence: 84%

Section: Analytical Calculations and Brief Analysis Of Experimental O...mentioning

confidence: 99%

Section: Analytical Calculations and Brief Analysis Of Experimental O...mentioning

confidence: 99%

“…[5], for a review). It is necessary to mention that peeling modes for zero net current plasma were found numerically [6][7][8]. In all cases the numerical code CAS3D [9,10] was used.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations