Parr E, McClements KG, Heidbrink WW, Michael CA, Prechel G, Rivero-Rodriguez JF. Studying fast-ion populations using oscillations in solid-state neutral-particle analyzer signal and neutral-beam injection power.
THE REVIEW OF SCIENTIFIC INSTRUMENTS 2024;
95:013508. [PMID:
38230994 DOI:
10.1063/5.0178179]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2023] [Accepted: 12/18/2023] [Indexed: 01/18/2024]
Abstract
A method for determining the fast-ion population density in magnetically confined plasmas as a function of pitch-radius, (λ, R), using a solid-state neutral-particle analyzer (ssNPA) signal and neutral-beam injection (NBI) power-output data has been developed. Oscillations in the NBI power output are replicated only in the active part of the ssNPA signal, allowing this to be separated from the passive and background signals, which usually complicate data from this diagnostic. Results obtained using this method are compared with those from standard techniques using data from the Mega-Amp Spherical Tokamak Upgrade spherical tokamak.
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