Detection of a new parametric decay instability branch in TST-2 during high harmonic fast wave heating

Adachi, Y.; Ejiri, A.; Takase, Y.; Watanabe, O.; Oosako, T.; Tojo, H.; Kainaga, S.; Masuda, T.; Sasaki, M.; Sugiyama, J.; Yamaguchi, T.

doi:doi:10.1063/1.2955574

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Review of Scientific Instruments / Volume 79 / Issue 10 / PROCEEDINGS OF THE 17TH TOPICAL CONFERENCE ON HIGH-TEMPERATURE PLASMA DIAGNOSTICS / OPTICAL (IR, VISIBLE, UV, EUV), MOTIONAL STARK EFFECT, CHARGE EXCHANGE, RECOMBINATION, BEAM EMISSION SPECTROSCOPY, OPTICAL SPECTROSCOPY, AND SUPRATHERMAL ELECTRONS—BRENTLY STRATTON, SESSION CHAIRMAN

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Rev. Sci. Instrum. 79, 10F507 (2008); http://dx.doi.org/10.1063/1.2955574 (3 pages)

Detection of a new parametric decay instability branch in TST-2 during high harmonic fast wave heating ^a

^a Contributed paper, published as part of the Proceedings of the 17th Topical Conference on High-Temperature Plasma Diagnostics, Albuquerque, New Mexico, May 2008.

Y. Adachi, A. Ejiri, Y. Takase, O. Watanabe, T. Oosako, H. Tojo, S. Kainaga, T. Masuda, M. Sasaki, J. Sugiyama, and T. Yamaguchi

The University of Tokyo, Kashiwa 277-8561, Japan

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(Received 12 May 2008; accepted 1 June 2008; published online 31 October 2008)

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Abstract

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Article Objects (6)

Related Content

Parametric decay instability (PDI) is often observed in the TST-2 spherical tokamak during high harmonic fast wave heating by rf pickup probes. The frequency spectrum exhibits lower and upper sideband peaks in addition to the pump wave at f₀ = 21 MHz. Two types of PDI are observed. One is the well-known decay into the ion-cyclotron quasimode (nf_ci) and the ion Bernstein wave (f₀−nf_ci). The other is a newly found decay with the sideband frequency between f₀ and f₀−f_ci. The frequency difference between this sideband and the pump increases in proportion to B_t. Moreover, high-speed visible light measuring systems with photomultiplier tubes or hybrid photodetectors viewing the plasma core detected oscillation of light emission at around f₀.

Article Outline

INTRODUCTION
MEASUREMENT SYSTEM
EXPERIMENTAL RESULTS AND DISCUSSION
1. Measurement by a rf pickup probe
2. Measurement by a high-speed visible light measuring system

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KEYWORDS and PACS

Keywords

parametric instability, photodetectors, photomultipliers, plasma Bernstein waves, plasma heating, plasma oscillations, plasma probes, Tokamak devices

PACS

52.35.Py

Macroinstabilities (hydromagnetic, e.g., kink, fire-hose, mirror, ballooning, tearing, trapped-particle, flute, Rayleigh-Taylor, etc.)
52.55.Fa

Tokamaks, spherical tokamaks
52.70.Ds

Electric and magnetic measurements
52.35.Hr

Electromagnetic waves (e.g., electron-cyclotron, Whistler, Bernstein, upper hybrid, lower hybrid)
52.35.Fp

Electrostatic waves and oscillations (e.g., ion-acoustic waves)
52.50.-b

Plasma production and heating

ARTICLE DATA

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http://dx.doi.org/10.1063/1.2955574

PUBLICATION DATA

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0034-6748 (print)

1089-7623 (online)

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American Institute of Physics

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Rev. Sci. Instrum. 77, 10E933 (2006)RSINAK00007700001010E933000001

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