The Upgrade Of X-ray Crystal Spectrometer And Preliminary Experimental Results On ICRF Flow Drive On EAST

This dissertation mainly introduced the upgrade of the tangential X-ray Imaging Crystal Spectrometer (XICS) system on EAST, including the motivation, upgrading scheme, the installment and debugging of diagnostic system, and the preliminary experimental result on EAST. Based on core plasma toroidal rotation measured by XICS, the preliminary experimental research on plasma toroidal rotation induced by ion cyclotron range of frequency (ICRF) wave on EAST was also carried out, and research results was presented.Due to the high auxiliary heating power and the long-pulse steady-state operation on EAST, plasma with a higher temperature and prolonged discharge time cannot be measured by the original XICS. To this end, the XICS system on EAST was upgraded, and successfully put into operation in the latest EAST campaign, the preliminary experiment result was also obtained. With the application of a new full-size water-cooled PILATUS900K detector, XICS can offer plasma parameters within a temporal and spatial resolution of1.5cm/10ms, and cover the plasma height of-0.9m, not only meeting the high count rate requirement under a high auxiliary heating power, but also improving the ability to work for a long time, so as to meet the measurement of the long-pulse discharge. Using the double crystal, it is the first time for XICS to obtain the He-and H-like spectra of argon ion at the same time on EAST, proving the feasibility of double crystal in improving plasma temperature range for XICS. The absolute wavelength calibration method using x-ray fluorescence still face the challenge of generating the sufficiently intensity characteristic spectral line as a reference wavelength for calibration.Core plasma rotation of both L-mode and H-mode discharges with ICRF minority heating (MH) scheme were measured with the tangential X-ray imaging crystal spectrometer on EAST. Co-current central impurity toroidal rotation change was observed in ICRF-heated L-and H-mode plasmas. Rotation increment as high as30km/s was generated at～1.7MW ICRF power. Scaling results showed similar trend as the Rice scaling, i.e. rotation increase versus stored energy increase, but with significant scattering especially in L-mode plasmas, indicating other parameters may affect plasma rotation. We varied plasma current, toroidal field and magnetic configuration separately to study their effect on L-mode plasma rotation, while keeping other major plasma parameters and heating unchanged during the scanning. It was found that larger plasma current could induce plasma rotation more efficiently. A scan of toroidal magnetic field indicated that the largest rotation was obtained for on-axis ICRF heating. The comparison between lower-single-null (LSN) than (double-null) DN configurations showed that LSN discharges rendered larger rotation change for the same power input and plasma parameters.