Speaker
Yi Yu
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/P5.1006.pdf
Development and First Result of Phase Contrast Imaging Diagnostic on
HL-2A tokamak
Y.Yu1,M.Xu2,S.B.Gong1,2,L.Nie2,T.Lan1,R.Ke2,Y.F.Wu1,2,B.D.Yuan1,2,D.Guo2,T.Long2,H.
J.Wang1,S.F.Mao1,M.Y.Ye1,X.R.Duan2 and HL-2A team
1
School of Physics, University of Science and Technology of China, 230026, Hefei, China
2
Southwestern Institute of Physics, P. O. Box 432, 610041, Chengdu, China
We report the development of Phase Contrast Imaging (PCI) diagnostic on HL-2A
tokamak, together with first experimental results. This diagnostic is to measure the phase
shift of a CO2 laser probe when it passes through plasma. This system is designed to
diagnose plasma density fluctuations with the maximum wavenumber of 15 cm-1. The
designed wavenumber resolution is 2cm-1, and the time resolution can reach 0.2 μs. The
broad kρs ranges from 0.2 to 3. The signal series in different PCI channels show a
pronounced modulation of incident laser beam by the sound wave. The conversion
relationship between the chord integral plasma density fluctuation and the signal intensity
is 2.3×1013 m-2/mV, indicating a high sensitivity. First experimental results show the
ability for turbulence investigation.
