Erratum: “Observation of tearing mode deceleration and locking due to eddy currents induced in a conducting shell” [Phys. Plasmas <b>11</b>, 2156 (2004)]

Chapman, B. E.; Fitzpatrick, Richard; Craig, D.S.; Martin, P.; Spizzo, G.

doi:10.1063/1.1792614

Cited by 6 publications

(12 citation statements)

References 10 publications

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“…4͑c͒, it is also interesting to highlight that when the dominant mode starts to increase, the corresponding rotation decreases; this can be ascribed to the increase in the electromagnetic braking torque, as described in Ref. 30. The duration of the QSH state in EXTRAP T2R is quite short compared to other devices.…”

Section: Phenomenology Of Qsh Regimesmentioning

confidence: 83%

“…The growth of the dominant mode and the corresponding breaking of the mode velocity during QSH regimes was studied in detail in MST, see Ref. 30 At present, the QSH regime in EXTRAP T2R does not seem to significantly affect the global confinement. An explanation could be that the amplitude of the dominant mode ͑hence the size of island͒ and/or the duration of the QSH state could be too small to produce relevant effects on the confinement.…”

Section: Discussionmentioning

confidence: 99%

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Spontaneous quasi single helicity regimes in EXTRAP T2R reversed-field pinch

et al. 2007

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In recent years, good progress toward a better understanding and control of the plasma performance in reversed-field pinch devices has been made. These improvements consist both of the discovery of spontaneous plasma regimes, termed the quasi single helicity ͑QSH͒ regime, in which part of the plasma core is no longer stochastic, and of the development of techniques for active control of plasma instabilities. In this paper, a systematic study of spontaneous QSH in the EXTRAP T2R device ͓P. R. Brunsell, H. Bergsaker, M. Cecconello et al., Plasma Phys. Control. Fusion 43, 1457 ͑2001͔͒ is presented. In this device, QSH states can occur spontaneously and it is associated with magnetic and thermal structures. A statistical analysis to determine the most favorable experimental conditions to have a transition to the QSH regime will be presented. The results described here are useful to understand the underlying properties of QSH regimes in view of future applications of the QSH active control in EXTRAP T2R; they are also important to have a comparison with the QSH studied in other devices.

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Section: Phenomenology Of Qsh Regimesmentioning

confidence: 83%

Section: Discussionmentioning

confidence: 99%

Spontaneous quasi single helicity regimes in EXTRAP T2R reversed-field pinch

et al. 2007

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“…Magnetic islands are observed to affect the performance of stellarators [1], reversed-field pinches [2], and tokamaks [3]. It is thus important to understand the factors that determine their size.…”

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confidence: 99%

“…Recently, Ottaviani et al [12] have reexamined the mechanisms responsible for density flattening, proposing that collisional parallel transport is the relevant mechanism for flattening when k 2 k D k k k c s , where D k T e =0:51m e e and e is the electron collision frequency. In this Letter, we restrict attention to the regime W s L s =L n where acoustic effects are unimportant, but we retain the parallel transport effects pointed out in Ref.…”

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confidence: 99%

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Natural Velocity of Magnetic Islands

Waelbroeck

2005

Phys. Rev. Lett.

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The phase velocity of magnetic islands is calculated in the semicollisional regime with cold ions. Two solution branches arise, corresponding to islands propagating with the ions and with the electrons. For the ion branch the phase velocity and the polarization current are small. For the electron branch, the phase velocity depends on the ratio of W, the half-width of the island, and s , the Larmor radius calculated with the electron temperature. For W s the phase velocity is larger than the electron drift velocity and the polarization current is destabilizing. For W s , the situation is reversed provided that the density and temperature gradients point in the same direction.

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Two-fluid magnetic island dynamics in slab geometry. II. Islands interacting with resistive walls or resonant magnetic perturbations

Fitzpatrick

Waelbroeck

2005

Physics of Plasmas

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The dynamics of a propagating magnetic island interacting with a resistive wall or a static external resonant magnetic perturbation is investigated using two-fluid, drift-MHD (magnetohydrodynamical) theory in slab geometry. In both cases, the island equation of motion is found to take exactly the same form as that predicted by single-fluid MHD theory. Three separate ion polarization terms are found in the Rutherford island width evolution equa-

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Erratum: “Observation of tearing mode deceleration and locking due to eddy currents induced in a conducting shell” [Phys. Plasmas 11, 2156 (2004)]

Cited by 6 publications

References 10 publications

Spontaneous quasi single helicity regimes in EXTRAP T2R reversed-field pinch

Spontaneous quasi single helicity regimes in EXTRAP T2R reversed-field pinch

Natural Velocity of Magnetic Islands

Two-fluid magnetic island dynamics in slab geometry. II. Islands interacting with resistive walls or resonant magnetic perturbations

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