A multiplexer-based multi-channel microwave Doppler backward scattering reflectometer on the HL-2A tokamak
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.
- Publication:
-
Review of Scientific Instruments
- Pub Date:
- October 2018
- DOI:
- 10.1063/1.5035260
- Bibcode:
- 2018RScI...89jH104S