Speaker
H.J. Wang
(School of Nuclear Science and Technology)
Description
Abstract：Beam Emission Spectroscopy (BES) diagnostic based on neutral beam injection (NBI) has recently been developed in EAST tokamak. A 128-channel Hamamatsu S8550 APD detector array is chosen as the core device. Three cavity interference filter with a center frequency of 659.33nm and a bandwidth of 1.59nm is used to eliminate the interference Dα signal and carbon impurities radiation. This BES system diagnoses the plasma density fluctuation with a sample rate of 1MHz and a spatial resolution of 1-3cm. It can diagnose a rectangular area in one shot, with a radial length of 20cm and a vertical length of 10cm. in the plasma cross section, which is movable from the core plasma to the edge of low field side of EAST by means of changing the angle of beam splitting lens. Space calibration and filter test are also presented. Data in the recent experiments of BES show the great change of density fluctuations in the L-H transition.
Co-authors
B. Lyu
(Institute of Plasma Physics Chinese Academy of Sciences, Hefei,Anhui, China)
B.D. Yuan
(School of Nuclear Science and Technology, University of Science and Technology of China, Hefei,Anhui, China)
B.N. Wan
(Institute of Plasma Physics Chinese Academy of Sciences, Hefei,Anhui, China)
H.J. Wang
(School of Nuclear Science and Technology, University of Science and Technology of China, Hefei,Anhui, China;Institute of Plasma Physics Chinese Academy of Sciences, Hefei,Anhui, China)
M.Y. Ye
(School of Nuclear Science and Technology, University of Science and Technology of China, Hefei,Anhui, China)
R. Chen
(Institute of Plasma Physics Chinese Academy of Sciences, Hefei,Anhui, China)
S.Y. Feng
(School of Nuclear Science and Technology, University of Science and Technology of China, Hefei,Anhui, China;Institute of Plasma Physics Chinese Academy of Sciences, Hefei,Anhui, China)
Y. Yu
(School of Nuclear Science and Technology, University of Science and Technology of China, Hefei,Anhui, China)
Y.F. Wu
(School of Nuclear Science and Technology, University of Science and Technology of China, Hefei,Anhui, China)
Y.J. Shi
(School of Nuclear Science and Technology, University of Science and Technology of China, Hefei,Anhui, China)
Y.M. Hou
(School of Nuclear Science and Technology, University of Science and Technology of China, Hefei,Anhui, China;Institute of Plasma Physics Chinese Academy of Sciences, Hefei,Anhui, China)
