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Updated: Nov 10, 2025

High-speed Continuous-wave Stimulated Brillouin Scattering Spectrometer for Material Analysis
Published on: September 22, 2017
Doppler backscattering diagnostic with dual homodyne detection on the Globus-M compact spherical tokamak
V V Bulanin1, A Y Yashin1, A V Petrov1
1Advanced Plasma Research Laboratory, Peter the Great St. Petersburg Polytechnic University, 195251 St. Petersburg, Russia.
Abstract:
This article considers a four-frequency microwave Doppler backscattering (DBS) system in the compact spherical tokamak Globus-M. The hardware was adequate for the purposes of studying the peripheral plasma in the tokamak. The multichannel DBS system is based on duplication of a dual homodyne detection circuit for four incident Ka-band frequencies. The ray tracing results for a spherical torus are described, and specific requirements for the antenna tilt adjustment are defined. Some new experimental results are given for using DBS diagnostics on the Globus-M tokamak in order to illustrate its efficiency.
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