2022/10/31 by Hongming Zhang, Zichao, Lin, Wang Fudi +24
Materials Science · Physics and Astronomy · #FOS: Physical sciences #Fusion materials and technologies #Magnetic confinement fusion research #Nuclear Physics and Applications #Plasma Physics (physics.plasm-ph)
paper · pdf · doi:10.48550/arxiv.2210.17129
openalex publication_date 2022/10/31 · openalex created_date 2022/11/06 · openalex updated_date 2026/07/28
Impurity degrades tokamak plasmas confinement by causing energy loss, diluting the fuel concentration, even terminating the discharges in some extreme cases. Previously, the suppression effects of on-axis Electron Cyclotron Resonance Heating (ECRH) on the impurity accumulation have been investigated on EAST by the extreme ultraviolet (EUV) spectroscopy. However, it is difficult to quantify the changes in impurity tungsten (W) profile since the W line emissions in the EUV range could not be easily resolved. The X-ray Crystal Spectroscopy (XCS), that used to provide the ion temperature and the rotation velocity by measuring lines emissions in the soft X-ray range, also can be used to study the behavior of impurity W emissions. To begin with, in-situ absolute intensity calibration for Tangential XCS (TXCS) is conducted by analyzing the measurements of the bremsstrahlung radiation intensity. After obtaining the calibration coefficient, W44+ ion density profiles are evaluated by Abel inversion using the spectral line of W XLV (3.9095 Å). Thus, a direct observation of W44+ impurity concentration suppressed by ECRH is accomplished. The obtained W density profiles can be used to analyze the W transport by combining with the impurity transport codes in the future.