Low-Q MHD activity studies on TFR

,

doi:10.1088/0029-5515/24/6/011

Nucl. Fusion

1984

DOI: 10.1088/0029-5515/24/6/011

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Low-Q MHD activity studies on TFR

Abstract: TFR has been operated in low-q(a) conditions, with a special emphasis on the understanding of the so-called current limit. Several schemes have been used, one of the most promising being magnetic surface skinning with a variable toroidal field. A detailed analysis of Mirnov coil and soft-X-ray signals is presented and the results are discussed.

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Cited by 8 publications

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Investigations of low q a discharges in the SINP tokamak

et al. 2002

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Low edge safety factor discharges including very low q a (1 q a 2) and ultra low q a (0 q a 1) have been obtained in the SINP tokamak. It has been observed that accessibility of these discharges depends crucially on the fast rate of plasma current rise. Several interesting results in terms of different time scales like T q a , τ R etc have been obtained using a set of softwares developed at SINP. From fluctuation analysis of the external magnetic probe data it has been found that MHD instabilities m 1, n 1 and m 2, n 1 etc. play major role in the evolution of these discharges. To investigate the internal details of these discharges, an internal magnetic probe system has been developed using which current density j φ and other related parameters have been estimated. By carrying out a resistive stability analysis, evidence of the above-mentioned MHD instabilities have again been found. The physical processes lying behind the accessibility and evolution of the low q a discharges have been thoroughly investigated.

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Investigations of low q a discharges in the SINP tokamak

et al. 2002

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MHD mode evolutions prior to minor and major disruptions in SST-1 plasma

Dhongde

Pradhan

Bhandarkar

2017

Fusion Engineering and Design

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Self-organized magnetic equilibria in tokamak plasmas with very low edge safety factor

et al. 2022

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Tokamak plasmas often exhibit self-organizing behavior in which internal modes shape the toroidal current density profile, a common example being the sawtooth instability. However, such behavior has not been studied in detail for edge safety factor below 2 due to disruptive kink instabilities that typically prevent operation in this regime. Now, steady tokamak plasmas with an edge safety factor down to 0.8 have been created in the Madison Symmetric Torus, where disruptions are prevented due to a thick, conductive wall and a feedback power supply that sustains the plasma current. Internal measurements and nonlinear magnetohydrodynamic modeling reveal a family of safety factor profiles with a central value clamped near unity as the edge safety factor decreases, indicating current profile broadening through a relaxation process. As the safety factor decreases, the magnetic fluctuations become irregular, and the electron energy confinement time decreases.

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Low-Q MHD activity studies on TFR

Cited by 8 publications

References 11 publications

Investigations of low q a discharges in the SINP tokamak

Investigations of low q a discharges in the SINP tokamak

MHD mode evolutions prior to minor and major disruptions in SST-1 plasma

Self-organized magnetic equilibria in tokamak plasmas with very low edge safety factor

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