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Imaging x-ray crystal spectrometer on EAST
Shi, Yuejiang,Wang, Fudi,Wan, Baonian,Bitter, Manfred,Lee, Sanggon,Bak, Jungyo,Hill, Kennith,Fu, Jia,Li, Yingying,Zhang, Wei,Ti, Ang,Ling, Bili Published jointly by The Institute of Physics and 2010 Plasma physics and controlled fusion Vol.52 No.8
<P>A high-resolution imaging x-ray crystal spectrometer is described for implementation on the EAST tokamak to provide spatially and temporally resolved data on the ion temperature, electron temperature and poloidal plasma rotation. These data are derived from observations of the satellite spectra of helium-like argon, Ar XVII, which is the dominant charge state for electron temperatures in the range from 0.4 to 3.0 keV and which is accessible to EAST. Employing a novel design, which is based on the imaging properties of spherically bent crystals, the spectrometers will provide spectrally and spatially resolved images of the plasma for all experimental conditions, which include ohmically heated discharges as well as plasmas with rf and neutral-beam heating. The experimental setup and initial experimental results are presented.</P>
Fudi Wang,Yuejiang Shi,Wei Zhang,Jia Fu,Yingying Li,Bao Nian Wan,이상곤,Manfred Bitter,Kenneth Hill 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.4
A new high-resolution tangential imaging X-ray crystal spectrometer (TXCS) is described for implementation on the Experimental Advanced Superconducting Tokamak (EAST) to provide spatially and temporally resolved data on the toroidal plasma rotation velocity and on the ion and the electron temperature. These data are derived from observations of the satellite spectra of heliumlike argon (Ar XVII). The TXCS will provide data for all experimental conditions, which include ohmically heated discharges as well as plasmas with radio-frequency (RF) waves and neutral-beam heating. The latest experimental results show that lower hybrid waves (LHW) induce a co-current change in a toroidal rotation of up to 45 km/s in the <i>L</i>-mode plasma core region. A modification of the toroidal rotation develops on the extended plasma region and a long time scale (≥1 s). The experimental setup and the initial experimental results are presented.