Speaker
Jing Wu
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/P5.1005.pdf
Simulation and Experimental Test Research on Hydrogen/Deuterium-α
Visible Spectra Diagnosis Based on HL-2A Tokamak
J. Wu1, L.M.Yao1, P.Chen1, H.Wen1, M.T.Zou1, Y.J.Chen1, W.Zhang1, J.T.Shen1
1 School of Physical Electronics, University of Electronic Science and Technology of China,
Chengdu 610054, China
As a priority diagnosis in the tokamak fusion device, the hydrogen-α and visible
spectroscopy could measure the distribution of impurities and hydrogen/deuterium densities
in the divertor and scraping of layers. In the divertor and scraping layer area, firstly, because
the divertor and the wall regions’ strong light reflection, directly and accurately measure the
region of impurities (helium, carbon, tungsten, etc.) and hydrogen/deuterium distribution
becomes difficult. Secondly, the strong magnetic field leads to the existence of Zeeman
splitting in the visible spectrum of this region, and the magnetic field is different in edge
locations, results in Zeeman splitting different. Based on this, the hydrogen-α and visible
spectrum diagnosis system of HL-2A were established. The visible emission spectra were
measured and fitted by simulation and experimental researches. The Zeeman Effect was used
to distinguish the reflected light information at different positions, thereby accurately
impurities, hydrogen/deuterium in the divertor and scraping layer could be obtained for
spatial and temporal distribution. It is important to study the steady-state operation of the
fusion device ITER and CFETR by measuring the correlation result under different
experimental discharge conditions, carrying out the constraint mode conversion, the fuel
cycle, the impurity and the plasma interaction researches. The author would thank Dr.
Manfred for the discussion of the test work on JET and design work for the ITER using
Zeeman paten to resolve the reflection light error on edge Dα diagnostics.
