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0D model of magnetized hydrogen helium wall conditioning plasmas

Tom Wauters, A Lyssoivan, D Douai, O Marchuk, D Wünderlich, R Koch, G Sergienko, Guido Van Oost UGent and M Van Schoor (2011) PLASMA PHYSICS AND CONTROLLED FUSION. 53(12).
abstract
In this paper the 0D description of magnetized toroidal hydrogen-helium RF discharges is presented. The model has been developed to obtain insight into the ICRF plasma parameters, particle fluxes to the walls and the main collisional processes, which is especially relevant for the comprehension of RF wall conditioning discharges. The 0D plasma description is based on the energy and particle balance equations for nine principal species: H, H(+), H(2), H(2)(+), H(3)(+), He, He(+), He(2)(+) and e(-). It takes into account (1) elementary atomic and molecular collision processes, such as excitation/ radiation, ionization, dissociation, recombination and charge exchange, and elastic collisions, (2) particle losses due to the finite dimensions of the plasma volume and confinement properties of the magnetic configuration, and particle recycling, (3) active pumping and gas injection, (4) RF heating of electrons (and protons) and (5) a qualitative description of plasma impurities. The model reproduces experimental plasma density dependences on discharge pressure and coupled RF power, both for hydrogen RF discharges (n(e) approximate to (1-5) x 10(10) cm(-3)) and for helium discharges (n(e) approximate to (1-5) x 10(11) cm(-3)). The modeled wall fluxes of hydrogen discharges are in the range of what is estimated experimentally: similar to 10(19)-10(20) m(-2) s(-1) for H atoms, and similar to 10(17)-10(18) m(-2) s(-1) for H(+) ions. It is found that experimentally evidenced impurity concentrations have an important impact on the plasma parameters, and that wall desorbed particles contribute largely to the total wall flux.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
RECOMBINATION, CROSS-SECTIONS, TRANSPORT, STELLARATOR, IONIZATION, COLLISIONS, GRAPHITE, ATOMS, H+
journal title
PLASMA PHYSICS AND CONTROLLED FUSION
Plasma Phys. Control. Fusion
volume
53
issue
12
article_number
125003
pages
20 pages
Web of Science type
Article
Web of Science id
000298644000046
JCR category
PHYSICS, FLUIDS & PLASMAS
JCR impact factor
2.425 (2011)
JCR rank
9/31 (2011)
JCR quartile
2 (2011)
ISSN
0741-3335
DOI
10.1088/0741-3335/53/12/125003
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
2008764
handle
http://hdl.handle.net/1854/LU-2008764
date created
2012-01-31 10:25:27
date last changed
2012-02-02 17:14:04
@article{2008764,
  abstract     = {In this paper the 0D description of magnetized toroidal hydrogen-helium RF discharges is presented. The model has been developed to obtain insight into the ICRF plasma parameters, particle fluxes to the walls and the main collisional processes, which is especially relevant for the comprehension of RF wall conditioning discharges. The 0D plasma description is based on the energy and particle balance equations for nine principal species: H, H(+), H(2), H(2)(+), H(3)(+), He, He(+), He(2)(+) and e(-). It takes into account (1) elementary atomic and molecular collision processes, such as excitation/ radiation, ionization, dissociation, recombination and charge exchange, and elastic collisions, (2) particle losses due to the finite dimensions of the plasma volume and confinement properties of the magnetic configuration, and particle recycling, (3) active pumping and gas injection, (4) RF heating of electrons (and protons) and (5) a qualitative description of plasma impurities. The model reproduces experimental plasma density dependences on discharge pressure and coupled RF power, both for hydrogen RF discharges (n(e) approximate to (1-5) x 10(10) cm(-3)) and for helium discharges (n(e) approximate to (1-5) x 10(11) cm(-3)). The modeled wall fluxes of hydrogen discharges are in the range of what is estimated experimentally: similar to 10(19)-10(20) m(-2) s(-1) for H atoms, and similar to 10(17)-10(18) m(-2) s(-1) for H(+) ions. It is found that experimentally evidenced impurity concentrations have an important impact on the plasma parameters, and that wall desorbed particles contribute largely to the total wall flux.},
  articleno    = {125003},
  author       = {Wauters, Tom and Lyssoivan, A and Douai, D and Marchuk, O and W{\"u}nderlich, D and Koch, R and Sergienko, G and Van Oost, Guido and Van Schoor, M},
  issn         = {0741-3335},
  journal      = {PLASMA PHYSICS AND CONTROLLED FUSION},
  keyword      = {RECOMBINATION,CROSS-SECTIONS,TRANSPORT,STELLARATOR,IONIZATION,COLLISIONS,GRAPHITE,ATOMS,H+},
  language     = {eng},
  number       = {12},
  pages        = {20},
  title        = {0D model of magnetized hydrogen helium wall conditioning plasmas},
  url          = {http://dx.doi.org/10.1088/0741-3335/53/12/125003},
  volume       = {53},
  year         = {2011},
}

Chicago
Wauters, Tom, A Lyssoivan, D Douai, O Marchuk, D Wünderlich, R Koch, G Sergienko, Guido Van Oost, and M Van Schoor. 2011. “0D Model of Magnetized Hydrogen Helium Wall Conditioning Plasmas.” Plasma Physics and Controlled Fusion 53 (12).
APA
Wauters, Tom, Lyssoivan, A., Douai, D., Marchuk, O., Wünderlich, D., Koch, R., Sergienko, G., et al. (2011). 0D model of magnetized hydrogen helium wall conditioning plasmas. PLASMA PHYSICS AND CONTROLLED FUSION, 53(12).
Vancouver
1.
Wauters T, Lyssoivan A, Douai D, Marchuk O, Wünderlich D, Koch R, et al. 0D model of magnetized hydrogen helium wall conditioning plasmas. PLASMA PHYSICS AND CONTROLLED FUSION. 2011;53(12).
MLA
Wauters, Tom, A Lyssoivan, D Douai, et al. “0D Model of Magnetized Hydrogen Helium Wall Conditioning Plasmas.” PLASMA PHYSICS AND CONTROLLED FUSION 53.12 (2011): n. pag. Print.