A two-crystal X-ray spectrometer system has been implemented in the EAST tokamak to simultaneously diagnose high- and low-temperature plasmas using He- and H-like argon spectra. But for future fusion devices like ITER and Chinese Fusion Engineering Test Reactor (CFETR), argon ions become fully stripped in the core and the intensity of the H-like lines will be significantly at high temperatures (Te > 5 keV). With increasing auxiliary heating power on EAST, the core plasma temperature could also reach 5 keV and higher. In such conditions, the use of a xenon puff becomes an appropriate choice for both ion-temperature and flow-velocity measurements. A new two-crystal system using a quartz 110 crystal (2d = 4.913 Å) to view He-like argon lines and a quartz 011 crystal (2d = 6.686 Å) to view Ne-like xenon spectra has been deployed on a poloidal X-ray crystal spectrometer. While the He-like argon spectra will be used to measure the plasma temperature in the edge plasma region, the Ne-like xenon spectra will be used for measurement in the hot core. The new crystal arrangement allows a wide temperature measurement ranging from 0.5 to 10 keV or even higher, being the first tests for burning plasmas like ITER and CFETR. The preliminary result of lab-tests, Ne-like xenon lines measurement will be presented.
Upgrade of X-ray crystal spectrometer for high temperature measurement using neon-like xenon lines on EAST
Note: Paper published as part of the Proceedings of the 22nd Topical Conference on High-Temperature Plasma Diagnostics, San Diego, California, April 2018.
R. J. Hu, J. Chen, L. F. Delgado-Aparicio, Q. P. Wang, X. W. Du, J. Shen, X. S. Yang, F. D. Wang, J. Fu, Y. Y. Li, M. Bitter, K. W. Hill, N. A. Pablant, S. G. Lee, Y. J. Shi, B. N. Wan, M. Y. Ye, B. Lyu; Upgrade of X-ray crystal spectrometer for high temperature measurement using neon-like xenon lines on EAST. Rev. Sci. Instrum. 1 October 2018; 89 (10): 10F110. https://doi.org/10.1063/1.5038885
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