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Diagnostic neutral beam injector for active spectroscopy of high beta plasmas

Authors :
N. Stupishin
V. Belov
A. Brul
V. Davydenko
P. Deichuli
A. Kolmogorov
V. Kolmogorov
V. Oreshonok
R. Vakhrushev
D. Osin
Source :
AIP Advances, Vol 14, Iss 6, Pp 065314-065314-6 (2024)
Publication Year :
2024
Publisher :
AIP Publishing LLC, 2024.

Abstract

The advanced fast ion-dominated high beta plasma is achieved using multi-MW neutral heating beams. To facilitate the diagnostics of this fast ion-dominated plasma, a high-energy and high-current diagnostic neutral beam (DNB) injector was designed and built by the Budker Institute of Nuclear Physics. The DNB injector made active measurements of ion temperature and rotational velocity possible with the help of charge-exchange spectroscopy for impurity ions and, most importantly, for the main ion (deuterium) component. A DNB energy of 40 keV was chosen to assure low beam attenuation in the plasma and to enable spectroscopic measurements along the entire plasma column. The diameter (level 1/e) of the ballistically focused DNB in the plasma is about 8 cm. To achieve a high temporal resolution, unique methods of beam modulation with a frequency of up to 10 kHz were implemented. The achieved high DNB current of 8 A in atomic hydrogen in combination with the beam modulation enables to obtain an acceptable signal-to-noise ratio of the measured spectra.

Subjects

Subjects :
Physics
QC1-999

Details

Language :
English
ISSN :
21583226
Volume :
14
Issue :
6
Database :
Directory of Open Access Journals
Journal :
AIP Advances
Publication Type :
Academic Journal
Accession number :
edsdoj.1451c378c9f3424089b54a04959023d9
Document Type :
article
Full Text :
https://doi.org/10.1063/5.0203708