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A multiplexer-based multi-channel microwave Doppler backward scattering reflectometer on the HL-2A tokamak
Zhongbing Shi1, Wulyu Zhong1, Zengchen Yang1
1Southwestern Institute of Physics, Chengdu 610041, China.
Abstract:
The Doppler backward scattering (DBS) reflectometer has become a well-established and versatile diagnostic technique for the measurement of density fluctuations and flows in magnetically confined fusion experiments. In this work, a novel multiple fixed-frequency array source with a multiplexer technique is developed and applied in the multi-channel DBS system. The details of the system design and laboratory tests are presented. Preliminary results of Doppler shift frequency spectra measured by the multi-channel DBS reflectometer systems are obtained. Characteristics of plasma rotation and turbulence before and after supersonic molecular beam injection are analyzed.
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