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Fast Charge Exchange Spectroscopy for Measurements of Ion-Velocity-Space Distribution Function

Mikirou YOSHINUMA¹⁾, Katsumi IDA¹⁾, Tatsuya KOBAYASHI^1,2)

1)

National Institute for Fusion Science, National Institutes of Natural Sciences, Toki, Gifu 509-5292, Japan

2)

The Graduate University for Advanced Studies, SOKENDAI, Toki, Gifu 509-5292, Japan

(Received 5 August 2024 / Accepted 10 November 2024 / Published 27 December 2024)

Abstract

Fast charge exchange spectroscopy of C VI (Δn = 8−7, λ = 529.05 nm) has been developed to measure the ion-velocity-space distribution function. The fast charge exchange spectroscopy system consists of an F2.8 lens spectrometer, image intensifier, and high-speed camera. To maximize photon count, we efficiently accumulate light from 50 optical fibers (400 µm core) into one spatial channel. By applying a curved multi-slit, one spectrometer has four spatial channels. This system has good time resolution with a frequency of 10 kHz beyond that of ion-ion collision and excellent accuracy (signal-to-noise ratio), enough to detect the deformation of carbon ion-velocity distribution from Maxwell-Boltzmann distribution.

Copyright (c) 2024 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

charge exchange spectroscopy, ion-velocity distribution function, plasma diagnostic

DOI: 10.1585/pfr.19.1402037

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