Causes of major tokamak disruptions

White, R.B.; Monticello, D.

doi:10.2172/5236562

Cited by 5 publications

(7 citation statements)

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“…An independent A' analysis [7], without toroidal effects, has been performed. Here, the current density profiles were fit with a 3-parameter function.…”

Section: Synopsis Of Jipp T-ii Resultsmentioning

confidence: 99%

Non-linear analysis of disruptions in the JIPP T-II tokamak

Hicks¹,

Carreras²,

Holmes³

et al. 1982

Nucl. Fusion

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A comparison is made between results of the profile control experiments on the JEPP T-II tokamak and those of the time evolution of tearing modes. Over a wide range of conditions, non-linear initial-value tearing-mode calculations are consistent with experimental results. In particular, the time scale of soft disruptions, as reflected in the negative Voltage spikes, given by the tearing-mode analysis, agrees with that obtained experimentally.

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“…An independent A' analysis [7], without toroidal effects, has been performed. Here, the current density profiles were fit with a 3-parameter function.…”

Section: Synopsis Of Jipp T-ii Resultsmentioning

confidence: 99%

Non-linear analysis of disruptions in the JIPP T-II tokamak

Hicks¹,

Carreras²,

Holmes³

et al. 1982

Nucl. Fusion

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“…Another effect which would slow the mode growth rates is the existence of some finite plasma resistivity. The m = 2/n = 1 tearing mode has historically been throught of as one fundamental cause of plasma disruptions [24][25][26][27][28][29]. The disruption is believed to occur when the 2/1 island overlaps with a 3/2 island, or contacts the limiter directly.…”

Section: Discussionmentioning

confidence: 99%

“…Analysis of the Bfl loop toroidal array indicates also a strong n = 1 growing perturbation, but it also indicates an n = 0 NUCLEAR FUSION, Vol. 28…”

Section: Delay Perio Dmentioning

confidence: 99%

Characteristics of low-q disruptions in PBX

Kaye¹,

Jahns²,

Morris³

et al. 1988

Nucl. Fusion

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At low q^ (2.3 < q^ < 4.5), in the Princeton Beta Experiment, the discharges are limited by a hard disruption following the growth and sawtooth-like 'crash' of a <25 kHz precursor oscillation. The disruption, which occurs even in discharges with <)3 t > well below the first stability regime boundary (=2.5 /XoI p /aB t), follows the crash of this precursor mode either immediately or with a delay of several milliseconds, with the immediate disruptions primarily occurring in the discharges with (0 t > close to the first regime limit. The highest limiting process. The delay period is interpreted as a period during which a locked mode, consisting of several toroidal components of comparable amplitude, grows. Because of the energy loss associated with the crash, the plasma goes vertically unstable during the delay period. The results of this study indicate that even within the relatively narrow low-q^ operating space, there is a continuum in the characteristics of the low-q^ disruptions with a primary dependence on the value of . While the ideal external kink instability may give rise to the growing oscillations that lead up to the ultimate disruption, the instabilities are weighted towards the edge only at the lowest q^, (<3) and highest . The results of this study indicate that effects outside the scope of ideal MHD theory may play a significant role in low-q^ disruptions.

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“…Use of this technique of measuring x ray fluctuations in tokamaks has been actively pursued at many laboratories since about 1972 [23][24][25][26][27][132][133][134][135][136][137][138] when "sawtooth oscillations" were discovered in the intensity of X-ray emission from the ST tokamak, as measured by a two-<?.etector system [132]. Because of the profound effect (deleterious in some cases and beneficial in others) the various modes of oscillation can have on plasma particle and energy confinement, MFE theorists and experimentalists have devoted much effort to measurement and interpretation of these fluctuations [23][24][25][26][27][132][133][134][135][136][137][138][139]. In addition, the XTS kas been extremely useful in characterizing the effects of impurity radiation on tokamak behavior and understanding the behavior and means of controlling impurities [10] .…”

Section: The X-ray Imaging Systemsmentioning

confidence: 99%