Spectral evolution of soft x-ray emission from optically thin, high electron
          temperature platinum plasmas

Hiroyuki Hara; Hayato Ohashi; Bowen Li; Padraig Dunne; Gerry O’Sullivan; Akira Sasaki; Chihiro Suzuki; Naoki Tamura; Hiroyuki A. Sakaue; Daiji Kato; Izumi Murakami; Takeshi Higashiguchi; LHD Experiment Group

doi:10.1063/1.4997413

APL Photonics (Aug 2017)

Spectral evolution of soft x-ray emission from optically thin, high electron temperature platinum plasmas

Hiroyuki Hara,
Hayato Ohashi,
Bowen Li,
Padraig Dunne,
Gerry O’Sullivan,
Akira Sasaki,
Chihiro Suzuki,
Naoki Tamura,
Hiroyuki A. Sakaue,
Daiji Kato,
Izumi Murakami,
Takeshi Higashiguchi,
LHD Experiment Group

Affiliations

Hiroyuki Hara: Department of Electrical and Electronic Engineering, Faculty of Engineering, Utsunomiya University, 7-1-2 Yoto, Utsunomiya, Tochigi 321-8585, Japan
Hayato Ohashi: Graduate School of Science and Engineering for Research, University of Toyama, Toyama, Toyama 930-8555, Japan
Bowen Li: School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
Padraig Dunne: School of Physics, University College Dublin, Belfield, Dublin 4, Ireland
Gerry O’Sullivan: School of Physics, University College Dublin, Belfield, Dublin 4, Ireland
Akira Sasaki: Kansai Photon Science Institute, National Institutes for Quantum and Radiological Science and Technology (QST), Kizugawa, Kyoto 619-0215, Japan
Chihiro Suzuki: National Institute for Fusion Science, National Institutes of Natural Sciences, Toki, Gofi 509-5292, Japan
Naoki Tamura: National Institute for Fusion Science, National Institutes of Natural Sciences, Toki, Gofi 509-5292, Japan
Hiroyuki A. Sakaue: National Institute for Fusion Science, National Institutes of Natural Sciences, Toki, Gofi 509-5292, Japan
Daiji Kato: National Institute for Fusion Science, National Institutes of Natural Sciences, Toki, Gofi 509-5292, Japan
Izumi Murakami: National Institute for Fusion Science, National Institutes of Natural Sciences, Toki, Gofi 509-5292, Japan
Takeshi Higashiguchi: Department of Electrical and Electronic Engineering, Faculty of Engineering, Utsunomiya University, 7-1-2 Yoto, Utsunomiya, Tochigi 321-8585, Japan
LHD Experiment Group: National Institute for Fusion Science, National Institutes of Natural Sciences, Toki, Gofi 509-5292, Japan

DOI: https://doi.org/10.1063/1.4997413
Journal volume & issue: Vol. 2, no. 8
pp. 081301 – 081301-7

Abstract

Read online

The soft x-ray spectra of heavy element plasmas are frequently dominated by unresolved transition array (UTA) emission. We describe the spectral evolution of an intense UTA under optically thin conditions in platinum plasmas. The UTA was observed to have a peak wavelength around 4.6 nm at line-of-sight averaged electron temperatures less than 1.4 keV at electron densities of (2.5–7.5) × 1013 cm−3. The UTA spectral structure was due to emission from 4d–4f transitions in highly charged ions with average charge states of q = 20–40. A numerical simulation successfully reproduced the observed spectral behavior.

Published in APL Photonics

ISSN: 2378-0967 (Online)
Publisher: AIP Publishing LLC
Country of publisher: United States
LCC subjects: Technology: Engineering (General). Civil engineering (General): Applied optics. Photonics
Website: https://aplphotonics.aip.org

About the journal