OPTICAL FLUCTUATION MEASUREMENTS OF TURBULENCE USING A DIAGNOSTIC BEAM ON PHAEDRUS-T

被引：15
作者：
EVENSEN, H
BROUCHOUS, D
DIEBOLD, D
DOCZY, M
FONCK, RJ
NOLAN, D
机构：
来源：
REVIEW OF SCIENTIFIC INSTRUMENTS | 1992年 / 63卷 / 10期
关键词：
D O I：
10.1063/1.1143552
中图分类号：
TH7 [仪器、仪表];
学科分类号：
0804 ; 080401 ; 081102 ;
摘要：
Plasma density turbulence has been measured with the beam emission spectroscopy (BES) diagnostic system, using a low-power neutral beam with He-0 and H-0 as beam species. In general, He-0 (588 nm) provided the best signal-to-noise ratio due to its lower edge plasma background interference. Simultaneous measurements of edge density fluctuations have been made with BES and Langmuir probes; the spectra are seen to be essentially identical, and the fluctuation amplitudes from both diagnostics are in close agreement. A poloidal coherence length of about 2-4 cm was observed. Radial propagation of modes was not seen, but a lab-frame poloidal phase velocity at r/a = 0.77 of about 7 X 10(5) cm/s in the electron diamagnetic direction was observed, corresponding to m = 8-75 kHz.
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页码：4928 / 4930
页数：3
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