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Atoms
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Atomic and Molecular Data for Hydrogen and Helium in Fusion...
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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) | Viewed by 29135

Special Issue Editors

Dr. Bastiaan J. Braams

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Guest Editor
Centrum Wiskunde & Informatica (CWI), Science Park 123, 1098XG Amsterdam, The Netherlands
Interests: plasma physics; fusion energy research; atomic and molecular physics; plasma-material interaction; computational science
Special Issues, Collections and Topics in MDPI journals
Dr. Xavier Urbain

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

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

E-Mail Website
Guest Editor
Department of Physics, University of Central Florida, Orlando, FL 32816, USA
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

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 submissions that pass pre-check are 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 monthly 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 1500 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

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Published Papers (4 papers)

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Research

874 KiB  
Article
Elementary Processes and Kinetic Modeling for Hydrogen and Helium Plasmas
by Roberto Celiberto, Mario Capitelli, Gianpiero Colonna, Giuliano D’Ammando, Fabrizio Esposito, Ratko K. Janev, Vincenzo Laporta, Annarita Laricchiuta, Lucia Daniela Pietanza, Maria Rutigliano and Jogindra M. Wadehra
Atoms 2017, 5(2), 18; https://doi.org/10.3390/atoms5020018 - 2 May 2017
Cited by 14 | Viewed by 5988
Abstract
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 [...] Read more.
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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799 KiB  
Article
Cross Sections and Rate Coefficients for Vibrational Excitation of HeH+ Molecule by Electron Impact
by Mehdi Ayouz and Viatcheslav Kokoouline
Atoms 2016, 4(4), 30; https://doi.org/10.3390/atoms4040030 - 20 Dec 2016
Cited by 12 | Viewed by 5670
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 [...] Read more.
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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1605 KiB  
Article
Rovibrationally Resolved Time-Dependent Collisional-Radiative Model of Molecular Hydrogen and Its Application to a Fusion Detached Plasma
by Keiji Sawada and Motoshi Goto
Atoms 2016, 4(4), 29; https://doi.org/10.3390/atoms4040029 - 20 Dec 2016
Cited by 29 | Viewed by 7652
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 X 1 Σ g + 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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5515 KiB  
Article
Evaluation of State-Resolved Reaction Probabilities and Their Application in Population Models for He, H, and H2
by Dirk Wünderlich and Ursel Fantz
Atoms 2016, 4(4), 26; https://doi.org/10.3390/atoms4040026 - 29 Sep 2016
Cited by 55 | Viewed by 8689
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 [...] Read more.
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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