Current drive by electron cyclotron waves

Alikaev, V. V.; Parail, V. V.

doi:10.1088/0741-3335/33/13/011

Cited by 29 publications

(41 citation statements)

References 17 publications

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“…Without X2 power, due to the low optical depth of the suprathermal population, the ECE is nearly thermal and tends to represent the bulk temperature. Note that in this case, the effective τ s to be used in equation (6) for the central channel of the radiometer is in fact equal to 0.018 and thus considerably lower than τ s = 0.5, owing to a 10cm relativistic shift towards the HFS. With 0.45MW of X2 power, the suprathermal population is thicker and with reference to equation (4), T ece is intermediate between bulk and suprathermal temperatures.…”

Section: Suprathermal Population Dependence On X2-eccd Preheating Powermentioning

confidence: 91%

High field side measurements of non-thermal electron cyclotron emission on TCV plasmas with ECH and ECCD

Blanchard

Alberti

Coda

et al. 2002

Plasma Phys. Control. Fusion

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Abstract. Measurements of electron cyclotron emission from the high field side of the TCV tokamak have been made on plasmas heated by second and third harmonic X-mode Electron Cyclotron Heating (ECH) and Electron Cyclotron Current Drive (ECCD). Suprathermal Electron Cyclotron Emission (ECE), up to a factor of 6 in excess of thermal emission, is detected in the presence of second harmonic X-mode (X2) ECCD and of third harmonic X-mode (X3) ECH. The measured ECE spectra are modelled using a bi-Maxwellian describing the bulk and the suprathermal electron populations. Suprathermal temperatures between 10-50keV and densities in the range 1 · 10 17 − 6 · 10 18 m −3 are obtained, and correspond to 3 -15 bulk temperatures and 1% -20% bulk densities. Good agreement between ECE suprathermal temperatures and energetic photon temperatures, measured by a hard X-ray camera, is found. For optically thin X3 Low Field Side (LFS) injection in presence of X2 CO-ECCD, the suprathermal population partly explains the discrepancy between global and first pass absorption measurements.

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Section: Suprathermal Population Dependence On X2-eccd Preheating Powermentioning

confidence: 91%

High field side measurements of non-thermal electron cyclotron emission on TCV plasmas with ECH and ECCD

Blanchard

Alberti

Coda

et al. 2002

Plasma Phys. Control. Fusion

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“…Experiments were performed on the T-10 tokamak [23] (major radius R 0 = 1.5 m) which is equipped by a full poloidal graphite limiter of radius a 0 = 0.33 m and a graphite rail limiter inserted in the vacuum chamber through the bottom port of the tokamak. For the experiments described below the minor plasma radius a L determined by the rail limiter was 0.30 m. The experiments were performed in deuterium plasma.…”

Section: Experimental Set-up and Plasma Parametersmentioning

confidence: 99%

Plasma structures and transport in the SOL of the T-10 tokamak

Kirnev

Budaev

Grashin

et al. 2005

Journal of Nuclear Materials

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“…Here I is the total toroidal current in plasma. As it is shown in experiments an auxiliary heating increases the value of n c by factor 1.5 and more [1,[6][7][8]. One may expect that the fusion power also can increase the critical plasma density.…”

Section: Introductionmentioning

confidence: 69%

Thermal Equilibrium and Density Limit in Tokamak-Reactor

Morozov¹,

Vafin²,

Mavrin³

2015

ujpa

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The problem of the thermal equilibrium and density limit in tokamak-reactor are analyzed. The empirical Greenwald criterion determining the critical plasma density may be exceeded in tokamaks with auxiliary heating. One may expect that the fusion power may increase the critical plasma density. The thermal balance in tokamak-reactors is discussed. The critical density is defined by the equality of heating (auxiliary plus fusion) power and radiation losses at the plasma edge. The influence of fusion power input as well as auxiliary heating on the critical density is studied. The analytic model is based on some simplifying assumptions. The auxiliary heating as well as the thermonuclear one is assumed to be localized at the center of the plasma column. The slab geometry is assumed for simplicity. It is shown that the critical density rises up increasing the fusion output drastically using the feedback control.

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Current drive by electron cyclotron waves

Abstract: We review theoretical and experimental investigations of current drive by electron cyclotron waves in tokamaks and stellarators. Advantages and disadvantages of their use in thermonuclear reactors are discussed. KEYWORDSPlasma; electron cyclotron waves; current drive.

Cited by 29 publications

References 17 publications

High field side measurements of non-thermal electron cyclotron emission on TCV plasmas with ECH and ECCD

High field side measurements of non-thermal electron cyclotron emission on TCV plasmas with ECH and ECCD

Plasma structures and transport in the SOL of the T-10 tokamak

Thermal Equilibrium and Density Limit in Tokamak-Reactor

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