Electron cyclotron emission at the fundamental harmonic in GDT magnetic mirror
A. G. Shalashov (1, 2), A. L. Solomakhin (1), E. D. Gospodchikov (1, and 2), L. V. Lubyako (1, 2), D. V. Yakovlev (1), P. A. Bagryansky (1), ((1) Budker Institute of Nuclear Physics SB RAS, Novosibirsk, Russia, (2), Institute of Applied Physics of Russian Academy of Sciences
TL;DR
This study reports on electron cyclotron emission measurements at the fundamental harmonic in the GDT magnetic mirror, revealing thermal and non-thermal electron emissions driven by microwave heating.
Contribution
It introduces new ECE diagnostics for the GDT device and provides experimental analysis of plasma emissions under various discharge conditions.
Findings
Detection of non-thermal ECE indicating suprathermal electrons
Successful implementation of ECE diagnostics near 54.5 GHz
Observation of plasma emission characteristics across different scenarios
Abstract
This paper summarizes the results of experiments on electron cyclotron emission (ECE) measurements at the fundamental harmonic recently performed at the axially symmetric magnetic mirror device GDT (Budker Institute, Novosibirsk). New ECE diagnostics is installed to facilitate the successful electron cyclotron resonance heating experiment and operates in the vicinity of the heating frequency of 54.5 GHz. Besides expected emission of thermal electrons, a clearly resolved non-thermal ECE is observed indicating the presence of suprathermal electrons driven by high-power microwave heating. The particulars of plasma emission are studied experimentally in a broad range of discharge scenarios.
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