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Experimental investigation of the propagation properties of an edge fluctuation in the KT-5C tokamak

Published online by Cambridge University Press:  01 December 1997

ZHAI KAN ,
XU YU-HONG ,
WEN YI-ZHI ,
YU CHANG-XUAN ,
LIU WAN-DONG ,
WANG CHAO ,
ZHUANG GE  and
XU ZHI-ZHAN
ZHAI KAN
Affiliation:
Department of Modern Physics, University of Science and Technology of China, Hefei, 230027 Anhui, China Shanghai Institute of Optics and Fine Mechanics, Academia Sinica, 201800 Shanghai, China
XU YU-HONG
Affiliation:
Department of Modern Physics, University of Science and Technology of China, Hefei, 230027 Anhui, China
WEN YI-ZHI
Affiliation:
Department of Modern Physics, University of Science and Technology of China, Hefei, 230027 Anhui, China
YU CHANG-XUAN
Affiliation:
Department of Modern Physics, University of Science and Technology of China, Hefei, 230027 Anhui, China
LIU WAN-DONG
Affiliation:
Department of Modern Physics, University of Science and Technology of China, Hefei, 230027 Anhui, China
WANG CHAO
Affiliation:
Department of Modern Physics, University of Science and Technology of China, Hefei, 230027 Anhui, China
ZHUANG GE
Affiliation:
Department of Modern Physics, University of Science and Technology of China, Hefei, 230027 Anhui, China
XU ZHI-ZHAN
Affiliation:
Department of Modern Physics, University of Science and Technology of China, Hefei, 230027 Anhui, China Shanghai Institute of Optics and Fine Mechanics, Academia Sinica, 201800 Shanghai, China
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Abstract

It is found on the KT-5C tokamak that an edge fluctuation can be excited using a pair of floating Langmuir-probe pins. This fluctuation propagates along the magnetic field, with its amplitude decreasing drastically when it is off the magnetic field line, which is similar to the results obtained from experiments on the TEXT tokamak. Moreover, our experimental observations indicate that the excited fluctuation propagates with the electron directional motion, and is mainly manifested in an electron density fluctuation. Physically, this excited fluctuation could be considered as modulation of the external electric field by electrons, and is carried by the electron directional motion wherever it goes. These results are in good agreement with the proposed ballistic model that can be derived by solving the linearized Vlasov equation.

Type
Research Article
Information
Journal of Plasma Physics , Volume 58 , Issue 4 , December 1997 , pp. 601 - 612
Copyright
1997 Cambridge University Press

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