Recent Progress on Identifications of Spectral Lines from Tungsten Ions in Low and High Ionization Stages Using Laboratory Plasmas for Fusion Research and Its Application to Plasma Diagnostics

S. Morita, C. F. Dong, D. Kato, T. Oishi, L. Zhang, K. Fujii, M. Goto, M. Hasuo, Y. Kawamoto, I. Murakami, N. Nakamura, H. A. Sakaue

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations

Abstract

Tungsten spectra in visible, vacuum ultra-violet (VUV) and extreme ultra-violet (EUV) wavelength ranges have been studied in LHD, EAST and HL-2A toroidal devices for magnetic-confinement fusion research. Tungsten spectra from low-ionized tungsten ions are observed in VUV and EUV ranges, e.g. W VI at 605.926 Å and W VII at 216.219 Å and 261.387 Å, and Doppler temperature of the W5+ ion and edge tungsten influx rate of the W6+ ion are analyzed. Ionization stages of unresolved transition array mainly consisting of W24+-W33+ ions at 15–70 Å are determined at each small wavelength interval of 0.1 Å based on radial profile measurement. The density profile is analyzed for W24+ and W27+ ions in addition to highly ionized ions, e.g. W44+ and W45+. Several magnetic dipole forbidden lines are observed, e.g. W XXVII and W XXVIII, and the density profile is also analyzed for W27+ ions. Contributions are made on tungsten diagnostics for fusion research through the present studies.

Original languageEnglish
Title of host publicationProceedings of the International Conference on Atomic, Molecular, Optical and Nano Physics with Applications - CAMNP 2019
EditorsVinod Singh, Rinku Sharma, Man Mohan, Mohan Singh Mehata, A. K. Razdan
PublisherSpringer Science and Business Media Deutschland GmbH
Pages23-36
Number of pages14
ISBN (Print)9789811676901
DOIs
StatePublished - 2022
Externally publishedYes
EventInternational Conference on Atomic, Molecular, Optical and Nano Physics with Applications, CAMNP 2019 - Delhi, India
Duration: Dec 18 2019Dec 20 2019

Publication series

NameSpringer Proceedings in Physics
Volume271
ISSN (Print)0930-8989
ISSN (Electronic)1867-4941

Conference

ConferenceInternational Conference on Atomic, Molecular, Optical and Nano Physics with Applications, CAMNP 2019
Country/TerritoryIndia
CityDelhi
Period12/18/1912/20/19

Funding

Acknowledgements The authors thank all the members of the LHD experiment group for their cooperation during the tungsten pellet experiments. This work was carried out under the general LHD collaboration (NIFS19KLPP058), and partly supported by Grant-in-Aid for Scientific Research (B) No. 16H04088.

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