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

被引：5
|
作者：
Adachi, Y. [1 ]
Ejiri, A. [1 ]
Takase, Y. [1 ]
Watanabe, O. [1 ]
Oosako, T. [1 ]
Tojo, H. [1 ]
Kainaga, S. [1 ]
Masuda, T. [1 ]
Sasaki, M. [1 ]
Sugiyama, J. [1 ]
Yamaguchi, T. [1 ]
机构：
[1] Univ Tokyo, Kashiwa, Chiba 2778561, Japan
来源：
REVIEW OF SCIENTIFIC INSTRUMENTS | 2008年 / 79卷 / 10期
关键词：
parametric instability; photodetectors; photomultipliers; plasma Bernstein waves; plasma heating; plasma oscillations; plasma probes; Tokamak devices;
D O I：
10.1063/1.2955574
中图分类号：
TH7 [仪器、仪表];
学科分类号：
0804 ; 080401 ; 081102 ;
摘要：
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 f(0)=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 (f(0)-nf(ci)). The other is a newly found decay with the sideband frequency between f(0) and f(0)-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 f(0).
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页数：3
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