The analysis of alfvén wave current drive and plasma heating in TCABR tokamak

Application of microwave reflectometry to study Alfvén wave resonances in the TCABR tokamak is described. A microwave reflectometer was used to register plasma density oscillations driven by the excited Alfvén waves, under the condition of the spectrum scanned by a controlled plasma density rise. It is shown that when the position of the local Alfvén resonance r A , which is defined by the relation ϭk ʈ (r A )C A (r A ), is close to the plasma zone where the microwave signal is reflected, the high-frequency modulation of the output signal of the reflectometer at the rf generator frequency increases. This method can give information about the localization of the rf power deposition zone in Alfvén wave plasma heating and current drive experiments. It also allows finding the plasma current profile in the region of the rf power deposition.

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“…15,16 The basic parameters in this investigation were the following. Plasma current I P ϭ70-95 kA; edge safety factor q(a)Ӎ3.…”

Section: Methodsmentioning

confidence: 99%

Application of microwave reflectometry to register Alfvén wave resonances in the TCABR tokamak

Ruchko

Valencia

Galvão

et al. 2004

Review of Scientific Instruments

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“…The experiments were carried out in the tokamak TCABR (a=0.18m, R=0.61m, B = 1.1T) [1,2]. The basic parameters in this investigation were the following.…”

Section: Methodsmentioning

confidence: 99%

“…The study of the excited RF field structure is essential part of the Alfvén wave experimental program that is currently carried out in TCABR tokamak [1,2,3]. These experiments should help to find out the optimal conditions for antennae performance and to ensure the effective plasma heating and noninductive current drive.…”

Section: Introductionmentioning

confidence: 99%

Identification of the Alfvén wave resonances in the TCABR tokamak by the microwave reflectometry

Ruchko¹,

Galvão²,

Lerche³

et al. 2004

Braz. J. Phys.

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The experimental results on the Alfvén mode structure identification by the microwave reflectometry in TCABR tokamak are presented. The knowledge of the spatial spectrum of the excited waves is crucial for optimization of Alfvén wave plasma heating and noninductive current drive scenarios in tokamak plasmas. No less important is the possibility to use the Alfvén wave excitation for diagnostic purposes. A microwave reflectometer with fixed frequency was used to register plasma density oscillations driven by the excited Alfvén waves, under the condition of the spectrum scanned by a controlled plasma density rise. It is shown that when the position of the local Alfvén resonance, r A , which is defined by relation ω = k // (r A )C A (r A ), is close to the plasma zone where the microwave signal is reflected, the high-frequency modulation of the output signal of the reflectometer at the RF generator frequency increases. The possibility to use the observed effect for finding the plasma current profile in tokamaks is discussed.

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“…The difficulties brought by high dielectric constants of ST plasmas are absent for Alfven waves. Indeed, the experimental evidences of Alfven wave current drive (AWCD) have been observed in the Phaedrus-T [6] and the TCABR [7] tokamaks without seeing serious trapped electron effects that was previously thought to reduce or eliminate the effects of current drive [8]. Of course, these two are both conventional tokamaks with relatively higher aspect ratio A = R 0 /a > 3, where R 0 and a are the major radius and minor radius * Corresponding author.…”

Section: Introductionmentioning

confidence: 99%

Analysis and design of the Alfven wave antenna system for the SUNIST spherical tokamak

Tan

Gao

2009

Fusion Engineering and Design

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The analysis of alfvén wave current drive and plasma heating in TCABR tokamak

Cited by 11 publications

References 2 publications

Application of microwave reflectometry to register Alfvén wave resonances in the TCABR tokamak

Application of microwave reflectometry to register Alfvén wave resonances in the TCABR tokamak

Identification of the Alfvén wave resonances in the TCABR tokamak by the microwave reflectometry

Analysis and design of the Alfven wave antenna system for the SUNIST spherical tokamak

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