Plasma and Fusion Research

Volume 18, 1401037 (2023)

Regular Articles

An Inductively Coupled Plasma System for Investigating Spectropolarimetric Responses of Solar Plasmas to Anisotropic Fields

Tomoko KAWATE^1,2), Haruhisa NAKANO^1,2), Yuwei HUANG³⁾, Daiki YAMASAKI^3,4), Kiyoshi ICHIMOTO³⁾, Motoshi GOTO^1,2), Satoru UENO³⁾, Goichi KIMURA³⁾, Joseph J. SIMONS²⁾ and Yasuko KAWAMOTO¹⁾

1): National Institute for Fusion Science, Toki 509-5292, Japan
2): The Graduate University for Advanced Studies, SOKENDAI, Toki 509-5292, Japan
3): Kyoto University, Kyoto 606-8502, Japan
4): Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara 252-5210, Japan

(Received 6 February 2023 / Accepted 5 April 2023 / Published 23 May 2023)

Abstract

High precision measurements and accurate modeling of atomic polarization under three-dimensional radiation transfer are crucial to understand the structures of magnetized solar plasmas. To develop and validate spectropolarimetric measurements and analyses, we set up an inductively coupled plasma (ICP) generator designed especially for ∼ 1-eV plasmas interacting with radiation and weak magnetic fields. The device was put in front of the focal plane of the Horizontal Spectrograph of the Domeless Solar Telescope at Hida Observatory of Kyoto University. In helium discharges, the typical electron temperature, electron density, and helium column density of the ICP are comparable values to those of solar prominences, and the direct comparison of spectra shows almost the same opacity at He I 1083 nm. Magnetic and radiation fields were introduced to the ICP, and the system successfully reproduced reasonable spectropolarimetric signals as compared with those from the solar prominences.

Keywords

astrophysical plasma, spectroscopy, polarization, diagnostics

DOI: 10.1585/pfr.18.1401037

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