A multiplexer-based multi-channel microwave Doppler backward scattering reflectometer on the HL-2A tokamak

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 techn...

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Bibliographic Details
Published in:Review of scientific instruments 2018-10, Vol.89 (10), p.10H104-10H104
Main Authors: Shi, Zhongbing, Zhong, Wulyu, Yang, Zengchen, Liang, Anshu, Wen, Jie, Jiang, Min, Shi, Peiwan, Fu, Binzhong, Chen, Chengyuan, Liu, Zetian, Ding, Xuantong, Yang, Qingwei
Format: Article
Language:English
Subjects:
Beam injection
Diagnostic systems
Doppler effect
Fluid dynamics
Laboratory tests
Molecular beams
Multiplexing
Reflectometers
Rotating plasmas
Scattering
Scientific apparatus & instruments
Systems design
Tokamak devices
Variation
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Summary: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.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.5035260