Special Issue "Atomic and Molecular Spectra in Magnetically Confined Torus Plasmas"

A special issue of Atoms (ISSN 2218-2004).

Deadline for manuscript submissions: 30 June 2021.

Special Issue Editors

Dr. Chihiro Suzuki
E-Mail Website
Guest Editor
National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan
Interests: highly charged ions; spectroscopy; heavy ions; helical devices; atomic database; collisional radiative modeling
Dr. Izumi Murakami
E-Mail Website
Guest Editor
National Institute for Fusion Science, Toki 509-5292, Japan
Interests: collisional-radiative model for fusion and astronomical plasmas; atomic structure; atomic database

Special Issue Information

Dear Colleagues,

A variety of atomic and molecular processes occur in magnetically confined torus plasmas for fusion research, such as tokamaks and helical devices, because of their unique plasma characteristics. Even though spectroscopic studies on hydrogen (and its isotopes) atoms and molecules are well developed, it is still a hot topic, relevant to the presence of fast particles, complex fundamental processes, and strong magnetic fields. Intrinsic/extrinsic impurities with various atomic numbers exist in fusion plasmas. Intrinsic impurities arising from plasma–wall interactions include beryllium, carbon, iron, molybdenum, and heavier elements. Emission spectra of heavy ions have recently attracted considerable attention since tungsten has been adopted as a divertor material in the ITER tokamak. A variety of extrinsic impurities are often injected into fusion plasmas with pellet or gas puffing for the purpose of impurity transport study or divertor heat load mitigation. In addition, fusion plasmas can be exploited for spectroscopic studies relevant not only to fusion but also to astrophysics, plasma applications, and basic atomic physics, thanks to the availability of state-of-the-art diagnostic tools.

The scope of this Special Issue is recent experimental and theoretical advances in relation to atomic and molecular spectra in magnetically confined torus plasmas. As mentioned above, the capability of fusion plasmas allows us to investigate a number of elements, from hydrogen to heavy elements, which entirely covers the periodic table. As the electron temperature ranges from a few eV (edge) to 10 keV (core) in fusion plasmas, a wide range of charge states, from neutral to hydrogen-like ions, must be investigated. These investigations are associated with different spectroscopic techniques optimized for specific photon energies. Furthermore, prediction/validation of experimental spectra using collisional radiative modeling and other basic experiments such as EBITs is also of great interest. Spectral line shapes including shifts, widths and splittings are important as powerful diagnostic tools in fusion plasmas. Review papers relevant to the above topics are also in the scope of this Special Issue.

Dr. Chihiro Suzuki
Dr. Izumi Murakami
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Atoms is an international peer-reviewed open access quarterly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • magnetically confined fusion
  • tokamaks
  • helical devices
  • plasmas
  • highly charged ions
  • spectroscopy
  • heavy ions
  • neutral atoms and molecules
  • spectral line shapes
  • atomic and molecular processes
  • atomic database
  • collisional radiative modeling

Published Papers (2 papers)

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Research

Open AccessArticle
Plasma Spectroscopy on an Aluminum-Pellet Ablation Cloud in an LHD Plasma with an Echelle Spectrometer
Atoms 2020, 8(4), 81; https://0-doi-org.brum.beds.ac.uk/10.3390/atoms8040081 - 13 Nov 2020
Cited by 1 | Viewed by 688
Abstract
We developed an echelle spectrometer for the simultaneous observation of the whole visible range with a high instrumental resolution, for example, 0.055 nm (full width at the half maximum) at 400 nm and 0.10 nm at 750 nm. With the spectrometer, the emission [...] Read more.
We developed an echelle spectrometer for the simultaneous observation of the whole visible range with a high instrumental resolution, for example, 0.055 nm (full width at the half maximum) at 400 nm and 0.10 nm at 750 nm. With the spectrometer, the emission from an ablation cloud of an aluminum pellet injected into a high-temperature plasma generated in the Large Helical Device (LHD) was measured. We separated the emission lines into Al I, II, III and IV groups, and estimated the electron temperature and density of the ablation cloud from the line intensity distribution and Stark broadening respectively, of each of the Al I, II and III groups. We also determined the Stark broadening coefficients of many Al II and III lines from the respective Stark widths with the estimated electron temperature and density. Full article
(This article belongs to the Special Issue Atomic and Molecular Spectra in Magnetically Confined Torus Plasmas)
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Open AccessArticle
Spectroscopic Measurement of Hydrogen Atom Density in a Plasma Produced with 28 GHz ECH in QUEST
Atoms 2020, 8(3), 44; https://0-doi-org.brum.beds.ac.uk/10.3390/atoms8030044 - 18 Aug 2020
Cited by 2 | Viewed by 731
Abstract
The spatial distribution of the hydrogen atom density was evaluated in a spherical tokamak (ST) plasma sustained only with 28 GHz electron cyclotron heating (ECH). The radially resolved Hδ emissivity was measured using multiple viewing chord spectroscopy and Abel inversion. A collisional-radiative [...] Read more.
The spatial distribution of the hydrogen atom density was evaluated in a spherical tokamak (ST) plasma sustained only with 28 GHz electron cyclotron heating (ECH). The radially resolved Hδ emissivity was measured using multiple viewing chord spectroscopy and Abel inversion. A collisional-radiative (CR) model analysis of the emissivity resulted in a ground-state hydrogen atom density of 1015–1016 m−3 and an ionization degree of 1–0.85 in the plasma. Full article
(This article belongs to the Special Issue Atomic and Molecular Spectra in Magnetically Confined Torus Plasmas)
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