Design of rotating resonant magnetic perturbation coil system in the STOR-M tokamak

Elgriw, S.; Adegun, Joseph; Patterson, Michael J.; Rohollahi, Akbar; Basu, Debjyoti; Nakajima, Masaru; Colville, Kale; Gomez, Daniel; Greenwald, Chelsea; Zhang, Jiping; Hirose, Akira; Xiao, C.

doi:10.1016/j.fusengdes.2017.03.161

Cited by 3 publications

(1 citation statement)

References 12 publications

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“…To be specific, in the presence of a static RMP with a sufficiently large amplitude, NTM will be decelerated and finally 'caught' by RMP, called locked mode [17]. For a rotating RMP, it can be used for unlocking the magnetic islands locked by intrinsic EFs and sustaining its toroidal and poloidal rotations [18]. Due to its great significance, many researches were carried out to study the dependence of locked mode threshold on plasma parameters [19], to understand its penetration process and screening mechanism [20,21], and to explore its potential on NTM suppression [22].…”

Section: Introductionmentioning

confidence: 99%

Control of neoclassical tearing mode by synergetic effects of resonant magnetic perturbation and electron cyclotron current drive in reversed magnetic shear tokamak plasmas

et al. 2020

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Synergetic effects of resonant magnetic perturbation (RMP) and electron cyclotron current drive (ECCD) on stabilizing neoclassical tearing mode (NTM) in reversed magnetic shear (RMS) tokamak plasmas are numerically investigated based on a set of reduced MHD equations. For the moderate separation, it is found that the explosive burst induced by the fast reconnection of double tearing mode (DTM) in the RMS configuration can be completely suppressed by externally applied RMPs. Zonal flows with strong shear induced by a rotating RMP play an important role in this suppression process. Moreover, turning on ECCD in advance is essential to mitigate the NTM. For the large separation without the explosive burst, two strategies, i.e. a continuous ECCD with static RMP and a modulated ECCD with rotating RMP, are separately investigated. It is shown that when the NTM is decelerated by a relatively slow rotating RMP, the modulated ECCD can have a better stabilizing effect. In addition, the ECCD deposition widths in both radial and helical angle directions, as well as the ECCD on-duty time, are analyzed in detail. The best effectiveness of ECCD is obtained and the relevant physical mechanisms are discussed.

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Section: Introductionmentioning

confidence: 99%

Control of neoclassical tearing mode by synergetic effects of resonant magnetic perturbation and electron cyclotron current drive in reversed magnetic shear tokamak plasmas

et al. 2020

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A low noise power supply based on buck converter for current regulation in an inductive load

Liu

Tan

Gao

et al. 2018

Review of Scientific Instruments

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High current regulations are widely required in tokamaks to generate a specific magnetic field for plasma confinement which is challenging for power electronics. For high current regulation, the stray inductance will cause high noise and surge voltage that may damage the power electronics. In addition, it is difficult to ensure both a fast response and a steady evolution. In this paper, a power supply based on a buck converter for high current regulation in an inductive load is described, in which insulated gate bipolar transistors are used as switches and two capacitor banks are used for energy storage. The first stage capacitor bank at a higher voltage ensures the fast current growth rate at the beginning of discharge and plays the role of wave filter later to reduce the noise. The second stage capacitor bank at a lower voltage provides the main energy required during discharge. A microcontroller is used to regulate the current by a feedback mechanism. This power supply can regulate the high current in an inductive load with low noise and fast response, which has been applied to the poloidal field coils and the ultrafast reciprocating probe system in the SUNIST (Sino-UNIted Spherical Tokamak) spherical tokamak.

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Design and implementation of a versatile H-bridge power supply for experiments on the STOR-M Tokamak

Bsharat

Patterson

Xiao

2023

Radiation Effects and Defects in Solids

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Design of rotating resonant magnetic perturbation coil system in the STOR-M tokamak

Cited by 3 publications

References 12 publications

Control of neoclassical tearing mode by synergetic effects of resonant magnetic perturbation and electron cyclotron current drive in reversed magnetic shear tokamak plasmas

Control of neoclassical tearing mode by synergetic effects of resonant magnetic perturbation and electron cyclotron current drive in reversed magnetic shear tokamak plasmas

A low noise power supply based on buck converter for current regulation in an inductive load

Design and implementation of a versatile H-bridge power supply for experiments on the STOR-M Tokamak

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