High power density electron cyclotron experiments in the L2M stellarator

Abrakov, V.V.; Akulina, D. K.; Andryukhina, E.D.; Batanov, G. M.; Berezhetskij, M.S.; Danilkin, I. S.; Donskaya, N.P.; Fedyanin, O.I.; Gladkov, G. A.; Grebenshchikov, S. E.; Harris, J. H.; Kharchev, N. K.; Khol'nov, Yu.V.; Колик, Л. В.; Коврижных, Л. М.; Larionova, N. F.; Летунов, А. А.; Likin, K. M.; Lyon, J. F.; Meshcheryakov, A. I.; Nechaev, Yu. I.; Petrov, A. E.; Sarksyan, K. A.; Sbitnikova, I.S.

doi:10.1088/0029-5515/37/2/i08

Cited by 40 publications

(3 citation statements)

References 4 publications

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“…ECRH has been used effectively for pre-ionization and start-up assist in many tokamaks and is used routinely for plasma production in stellarators (Lloyd et al 1991, Erckmann andGasparino 1994 andreferences therein;Yao et al 1994, Zhang et al 1995, Abrakov et al 1997. In tokamaks the confinement is poor during start-up, which as a consequence is very sensitive to stray magnetic fields, whereas in stellarators the external coils provide magnetic confinement during breakdown.…”

Section: Pre-ionization and Start-upmentioning

confidence: 99%

Overview of ECRH experimental results

Lloyd

1998

Plasma Phys. Control. Fusion

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A review of the present status of electron cyclotron heating and current drive experiments in toroidal fusion devices is presented. In addition to basic heating and current drive studies the review also addresses advances in wave physics and the application of electron cyclotron waves for instability control, transport studies, pre-ionization/start-up assist, etc. A comprehensive overview is given with particular emphasis on recent advances since the major review of Erckmann and Gasparino (1994) (Plasma Phys. Control. Fusion 36 1869), including results from the latest generation of high-power, high-frequency experiments.

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Section: Pre-ionization and Start-upmentioning

confidence: 99%

Overview of ECRH experimental results

Lloyd

1998

Plasma Phys. Control. Fusion

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“…The L-2M stellarator is an l = 2 stellarator with a major radius of R = 100 cm and a mean plasma radius of r = 11.5 cm [8]. The plasma was created and heated by one or two 75 GHz gyrotrons under electron cyclotron resonance conditions (ECRH) at the second harmonic of the electron gyrofrequency (the magnetic field at the axis was B t = 1.3-1.4 T).…”

Section: Analysis Of Turbulent Fluxesmentioning

confidence: 99%

Statistical analysis and modelling of turbulent fluxes in the plasma of the L-2M stellarator and the FT-2 tokamak

Скворцова¹,

Korolev²,

Batanov³

et al. 2006

Plasma Phys. Control. Fusion

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A comparative analysis is done of data on turbulent fluxes measured in the edge plasma in the L-2M stellarator and the FT-2 tokamak. This analysis is performed using the estimation-maximization algorithm to determine finite mixtures of normal distributions that give the best fit to the probability distributions (PDFs) of the increments of turbulent fluxes. The resulting PDFs indicate non-Brownian motion of particles, and the weight of rare transport events (heavy tails of PDFs of fluxes) can be calculated. The number of the normal processes in model mixtures, as well as their weights in the PDFs of the increments of the turbulent flux, change during L-H transition in FT-2. Characteristically, the number of normal processes for the H-regime of FT-2 is the same as for the L-2M stellarator, and the parameters of Gaussians are also similar. This fact may be interpreted as an indirect indication that the L-2M stellarator operates in the mode of improved plasma confinement (which is consistent with the neoclassical theory for stellarators).

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“…5 When these devices are operated at high plasma densities (overdense plasma, pe Ͼ ce ), direct ECR heating and current drive by the incident electromagnetic (EM) wave are not possible. Alternatively, linear conversion of the EM waves into the electrostatic electron Bernstein wave (EBW) 6 at the upper hybrid resonance (UHR) surface and subsequent damping at the cyclotron harmonics is being tried for overdense plasmas.…”

Section: Introductionmentioning

confidence: 99%

Electron Bernstein wave generation in a linear plasma system

Yadav

Bora

2004

Physics of Plasmas

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Electron Bernstein wave (EBW) generation via mode conversion is observed in a short cylindrical electron cyclotron resonance (ECR) plasma system. ECR plasma with input microwave power varying from 160 to 800 W is produced at an operating pressure of 10−3 mbar with hydrogen gas with a maximum plasma density of 3.1×1010 cm−3 at the center and plasma temperature of 10 eV. The axial magnetic field required for ECR in the system is produced by two identical magnetic coils arranged in the Helmholtz configuration. The fundamental ECR surface (B=875 G) is located at the geometrical center of the plasma system. Microwaves of 2.45±0.02 GHz from a magnetron in TE10 mode are launched radially to have extraordinary (X) wave in plasma. The EBW is observed to be generated at the upper hybrid resonance layer at a distance of 2 cm from the center towards the microwave source. The EBW is assumed to be generated through X-B mode conversion which is inferred by the observation of the parametric decay of the incident wave. The experimental results pertaining to the EBW detection and characterization are discussed in this paper.

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High power density electron cyclotron experiments in the L2M stellarator

Cited by 40 publications

References 4 publications

Overview of ECRH experimental results

Overview of ECRH experimental results

Statistical analysis and modelling of turbulent fluxes in the plasma of the L-2M stellarator and the FT-2 tokamak

Electron Bernstein wave generation in a linear plasma system

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