Plasma and Fusion Research

Volume 14, 2402020 (2019)

Regular Articles

Doppler Spectroscopy System for the Plasma Velocity Measurements in SMOLA Helical Mirror
Anna A. INZHEVATKINA1,2), Aleksander V. BURDAKOV2,3), Ivan A. IVANOV1,2), Vladimir V. POSTUPAEV1,2) and Anton V. SUDNIKOV1,2)
1)
Novosibirsk State University, Novosibirsk 630090, Russia
2)
Budker Institute of Nuclear Physics, Novosibirsk 630090, Russia
3)
Novosibirsk State Technical University, Novosibirsk 630073, Russia
(Received 20 September 2018 / Accepted 9 December 2018 / Published 12 February 2019)

Abstract

The measurements of the plasma velocity in the SMOLA helical mirror by observation of the Doppler shift of the Hα spectral lines emission were done by high spatial resolution spectrometer. A set of experiments was carried out with the different configuration and amplitude of the magnetic field. Potential is driven by plasma gun potentials. The radial distribution of the Doppler shift of the Hα line is used to calculate the velocity of neutral hydrogen, which gives the estimate of the plasma rotation velocity ω ≈ 106 s−1. The indicated velocity corresponds to the presence of the radial electric field E ∼ 70 V/cm. The dependence of the plasma rotation velocity on the radial profile of the electrostatic potential is discussed.

Keywords

plasma confinement, helical mirror, optical diagnostics, Doppler spectroscopy, plasma rotation velocity

DOI: 10.1585/pfr.14.2402020

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