Measurement of plasma rotation velocities with electrode biasing in the Saskatchewan Torus-Modified (STOR-M) tokamak

Xiao, C.; Jain, K. K.; Zhang, W.; Hirose, Akira

doi:10.1063/1.870626

Cited by 24 publications

(15 citation statements)

References 11 publications

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“…The first, contact method makes use of either a "probe" electrode placed in the tokamak or stellarator plasma (plus a power source or bank of capacitors), as in [56,[57][58][59][60][61][62], or an emission electrode (e.g. from tungsten or LaB 6 ) [56,63,64], to which the potential relative to the vacuum wall is supplied, and a power of no less than about 50-100 kW is spent.…”

Section: External Control Over Transport In Plasmamentioning

confidence: 99%

Toroidal stellarator diode: discharge features and electron transport

Lesnyakov

Волков

2006

Plasma Devices and Operations

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The radial dependences of the emission current I em of a small thermionic emitter at different anode voltages, as well as the current-voltage characteristics (CVCs) and the dependence of I em on the magnetic field B were measured to investigate the relationship between the electron transport and the E × B electric and magnetic fields in the toroidal stellarator diode system in stellarator-type magnetic traps (Uragan-3M and Uragan-2M torsatrons). It is demonstrated that the electron transport in the discharge is controlled to a large measure by an applied radial electric field, while the current jump (nonlinear dynamic behaviour) in the discharge is due to the attainment of the critical value by the radial electric field and to the occurrence of the ionization process. A phenomenological description of the CVCs showing a hysteresis behaviour is presented. A large variety of electron transport scalings (I em -B dependences) were obtained in two different torsatrons.

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Section: External Control Over Transport In Plasmamentioning

confidence: 99%

Toroidal stellarator diode: discharge features and electron transport

Lesnyakov

Волков

2006

Plasma Devices and Operations

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“…Mach probe measurements [7] suggest that the toroidal velocity increases (decreases) after positive (negative) biasing. A poloidal velocity shear layer is formed only with negative biasing, but not with positive biasing.…”

Section: Biasing Induced H-modementioning

confidence: 99%

The Role of Plasma Biasing in the H‐Modes in the STOR‐M Tokamak

Xiao

Hirose

2000

Contrib. Plasma Phys.

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H‐modes have been induced in the STOR‐M tokamak with various techniques, including short current pulses, electrode/limiter biasing, and compact torus injection.The common features of the H‐modes in STOR‐M include a sudden drop in the Hα radiation level, a significant increase in the electron density, and modification of the edge electron density and floating potential profiles. Other phenomena specific to certain types of H‐modes in STOR‐M will also be presented.

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“…Previously, series of dc and low frequency (around a hertz) ac electrode biasing [5][6][7][8][9][10] as well as turbulent feedback experiments [11][12][13] have been performed to understand the nature of turbulent transport and improved confinement achieved by edge turbulence suppression. Recently, it was planned to perform high frequency, within kilo-Hertz range, electrode biasing experiments on the STOR-M tokamak to study dependency of transport on biasing voltage frequency.…”

Section: Introductionmentioning

confidence: 99%

Application of high frequency biasing and its effect in STOR-M tokamak

Basu,

Nakajima,

Melnikov

et al. 2019

Preprint

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A pulsed oscillating power amplier has been developed to apply high frequency biasing voltage to an electrode at the edge of STOR-M tokamak plasma. The power amplier can deliver a peak-to-peak oscillating voltage up to 120V and current 30A within the frequency range 1kHz-50kHz. The electrode is located in the equatorial plane at radius ρ = 0.88. The frequency of the applied voltage has been varied between discharges. It is observed that the plasma density and soft x-ray intensity from the plasma core region usually increase within the frequency range 1kHz-5kHz but seldom increase above 5kHz. Transport simulation has been carried out for STOR-M tokamak parameters using the ASTRA simulation code to understand the physical process behind experimental observations. The model is based on the stabilizing effect of the pondermotive force due to oscillating inhomogeneous electric field produced by biasing voltage which can suppress anomalous transport. Simulation results can reproduce the experiment quite well.

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Measurement of plasma rotation velocities with electrode biasing in the Saskatchewan Torus-Modified (STOR-M) tokamak

Cited by 24 publications

References 11 publications

Toroidal stellarator diode: discharge features and electron transport

Toroidal stellarator diode: discharge features and electron transport

The Role of Plasma Biasing in the H‐Modes in the STOR‐M Tokamak

Application of high frequency biasing and its effect in STOR-M tokamak

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