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Zhong Yong Chen,Bao Nian Wan,Yuejiang Shi 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.2
The trapping of runaway electrons into local magnetic mirrors in a toroidal magnetic field has been observed in slide away discharges in the HT-7 tokamak. When the discharges went into the slide-away region with Parail-Pogutse instabilities, strong oscillations in the hard X-ray flux and in the electron cyclotron emission are observed. The runaway electrons are trapped into the local magnetic mirrors when they are pitch angle scattered by the anomalous Doppler resonance effect.
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.