Special Issue "Atomic and Molecular Data for Hydrogen and Helium in Fusion Plasma"

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

Deadline for manuscript submissions: closed (30 April 2017)

Special Issue Editors

Guest Editor
Dr. Bastiaan J. Braams

Nuclear Data Section, Division of Physical and Chemical Sciences, International Atomic Energy Agency, Vienna International Centre, P. O. Box 100, 1400 Vienna, Austria
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Interests: plasma physics; fusion energy research; atomic and molecular physics; plasma-material interaction; computational science
Guest Editor
Dr. Xavier Urbain

Université Catholique de Louvain, Institute of Condensed Matter and Nanosciences, Louvain-la-Neuve, Belgium
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Interests: atomic and molecular physics; plasma physics; laser physics
Guest Editor
Dr. Detlev Reiter

Institut für Plasmaphysik, Forschungszentrum Jülich, Germany
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Interests: fusion plasma physics; computational methods for plasma wall interactions; atomic and molecular processes in plasmas; Monte Carlo methods in transport theory
Guest Editor
Dr. Viatcheslav Kokoouline

Department of Physics, University of Central Florida, Orlando, Florida, USA
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Interests: electron-molecule collisions; atomic collisions; electron recombination or attachment to molecules; molecular photoionization

Special Issue Information

Dear Colleagues,

In the divertor and near-wall region of magnetic confinement fusion plasma experiments processes involving neutral atoms, molecules, and molecular ions are important. The primary plasma constituents are hydrogen and helium and their isotopes and the molecules and molecular ions may be in rovibrationally or electronically excited states. For a complete description, one needs cross-sections for collisions with electrons, collisions among the heavy particles, photon-induced and radiative processes and processes on the walls, all resolved with respect to rovibrational excited states and with respect to the hydrogen isotope (H, D, T). The present Special Issue contains contributions on fundamental data for collisional and radiative processes of hydrogen and helium in plasmas, including the negative ion H- and molecules and molecular ions H2, H2+, H3+, HeH+ and He2+. Largely the contributions reflect work done in the context of an International Atomic Energy Agency (IAEA) Coordinated Research Project (CRP) on “Atomic and Molecular Data for State-Resolved Modelling of Hydrogen and Helium and Their Isotopes in Fusion Plasma”, but other contributions are welcome.

Dr. Bastiaan J. Braams
Dr. Xavier Urbain
Dr. Detlev Reiter
Dr. Viatcheslav Kokoouline
Guest Editors

Manuscript Submission Information

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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 350 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

  • electron collisions
  • ion-atom collisions
  • ion-molecule collisions
  • hydrogen
  • helium
  • plasma processes
  • nuclear fusion

Published Papers (4 papers)

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Research

Open AccessFeature PaperArticle Elementary Processes and Kinetic Modeling for Hydrogen and Helium Plasmas
Atoms 2017, 5(2), 18; doi:10.3390/atoms5020018
Received: 30 November 2016 / Revised: 20 March 2017 / Accepted: 20 April 2017 / Published: 2 May 2017
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Abstract
We report cross-sections and rate coefficients for excited states colliding with electrons, heavy particles and walls useful for the description of H2/He plasma kinetics under different conditions. In particular, the role of the rotational states in resonant vibrational excitations of the
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We report cross-sections and rate coefficients for excited states colliding with electrons, heavy particles and walls useful for the description of H 2 /He plasma kinetics under different conditions. In particular, the role of the rotational states in resonant vibrational excitations of the H 2 molecule by electron impact and the calculation of the related cross-sections are illustrated. The theoretical determination of the cross-section for the rovibrational energy exchange and dissociation of H 2 molecule, induced by He atom impact, by using the quasi-classical trajectory method is discussed. Recombination probabilities of H atoms on tungsten and graphite, relevant for the determination of the nascent vibrational distribution, are also presented. An example of a state-to-state plasma kinetic model for the description of shock waves operating in H 2 and He-H 2 mixtures is presented, emphasizing also the role of electronically-excited states in affecting the electron energy distribution function of free electrons. Finally, the thermodynamic properties and the electrical conductivity of non-ideal, high-density hydrogen plasma are finally discussed, in particular focusing on the pressure ionization phenomenon in high-pressure high-temperature plasmas. Full article
(This article belongs to the Special Issue Atomic and Molecular Data for Hydrogen and Helium in Fusion Plasma)
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Open AccessFeature PaperArticle Cross Sections and Rate Coefficients for Vibrational Excitation of HeH+ Molecule by Electron Impact
Atoms 2016, 4(4), 30; doi:10.3390/atoms4040030
Received: 11 November 2016 / Revised: 9 December 2016 / Accepted: 14 December 2016 / Published: 20 December 2016
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Abstract
Cross sections and thermally-averaged rate coefficients for vibration (de-)excitation of HeH+ by an electron impact are computed using a theoretical approach that combines the multi-channel quantum defect theory and the UK R-matrix code. Fitting formulas with a few numerical parameters are derived
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Cross sections and thermally-averaged rate coefficients for vibration (de-)excitation of HeH + by an electron impact are computed using a theoretical approach that combines the multi-channel quantum defect theory and the UK R-matrix code. Fitting formulas with a few numerical parameters are derived for the obtained rate coefficients. The interval of applicability of the formulas is from 40 to 10,000 K. Full article
(This article belongs to the Special Issue Atomic and Molecular Data for Hydrogen and Helium in Fusion Plasma)
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Open AccessFeature PaperArticle Rovibrationally Resolved Time-Dependent Collisional-Radiative Model of Molecular Hydrogen and Its Application to a Fusion Detached Plasma
Atoms 2016, 4(4), 29; doi:10.3390/atoms4040029
Received: 30 June 2016 / Revised: 10 October 2016 / Accepted: 8 November 2016 / Published: 20 December 2016
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Abstract
A novel rovibrationally resolved collisional-radiative model of molecular hydrogen that includes 4,133 rovibrational levels for electronic states whose united atom principal quantum number is below six is developed. The rovibrational X1Σg+ population distribution in a SlimCS fusion demo detached
[...] Read more.
A novel rovibrationally resolved collisional-radiative model of molecular hydrogen that includes 4,133 rovibrational levels for electronic states whose united atom principal quantum number is below six is developed. The rovibrational X 1 Σ g + population distribution in a SlimCS fusion demo detached divertor plasma is investigated by solving the model time dependently with an initial 300 K Boltzmann distribution. The effective reaction rate coefficients of molecular assisted recombination and of other processes in which atomic hydrogen is produced are calculated using the obtained time-dependent population distribution. Full article
(This article belongs to the Special Issue Atomic and Molecular Data for Hydrogen and Helium in Fusion Plasma)
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Open AccessArticle Evaluation of State-Resolved Reaction Probabilities and Their Application in Population Models for He, H, and H2
Atoms 2016, 4(4), 26; doi:10.3390/atoms4040026
Received: 6 July 2016 / Revised: 2 September 2016 / Accepted: 21 September 2016 / Published: 29 September 2016
Cited by 2 | PDF Full-text (5515 KB) | HTML Full-text | XML Full-text
Abstract
Population models are a prerequisite for performing qualitative analysis of population densities measured in plasmas or predicting the dependence of plasma emission on parameter variations. Models for atomic helium and hydrogen as well as molecular hydrogen in low-pressure plasmas are introduced. The cross-sections
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Population models are a prerequisite for performing qualitative analysis of population densities measured in plasmas or predicting the dependence of plasma emission on parameter variations. Models for atomic helium and hydrogen as well as molecular hydrogen in low-pressure plasmas are introduced. The cross-sections and transition probabilities used as input in the atomic models are known very accurately, and thus a benchmark of these models against experiments is very successful. For H2, in contrast, significant deviations exist between reaction probabilities taken from different literature sources. The reason for this is the more complex internal structure of molecules compared to atoms. Vibrationally resolved models are applied to demonstrate how these deviations affect the model results. Steps towards a consistent input data set are presented: vibrationally resolved Franck–Condon factors, transition probabilities, and ionization cross-sections have been calculated and are available now. Additionally, ro-vibrational models for selected transitions are applied successfully to low-density, low-temperature plasmas. For further improving the accuracy of population models for H2, however, it is necessary to establish a comprehensive data set for ro-vibrationally resolved excitation cross-sections based on the most recent calculation techniques. Full article
(This article belongs to the Special Issue Atomic and Molecular Data for Hydrogen and Helium in Fusion Plasma)
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