Ghent University Academic Bibliography

Advanced

Modelling of impurity deposition in gaps of castellated surfaces with the 3D-GAPS code

Dmitry Matveev UGent, A Kirschner, A Litnovsky, M Komm, D Borodin, V Philipps and Guido Van Oost UGent (2010) PLASMA PHYSICS AND CONTROLLED FUSION. 52(7).
abstract
The Monte-Carlo neutral transport code 3D-GAPS is described. The code models impurity transport and deposition in remote areas, such as gaps between cells of castellated plasma-facing surfaces. A step-by-step investigation of the interplay of different processes that may influence the deposition inside gaps, namely particle reflection, elastic neutral collisions, different particle sources, chemical erosion and plasma penetration into gaps, is presented. Examples of modelling results in application to the TEXTOR experiment with a castellated test limiter are provided. It is shown that only with the assumption of the presence of species with different reflection probabilities, do simulated carbon deposition profiles agree with experimental observations for side surfaces of the gaps. These species can be attributed to different particle sources, e. g. carbon atoms and hydrocarbon radicals. Background carbon ions and atoms have low and moderate values of the reflection coefficient (R <= 0.6), while some of the hydrocarbon radicals produced by chemical erosion of redeposited carbon layers have high reflection probability (R >= 0.9). Deposition at the bottom of the gaps cannot be adequately reproduced unless extreme assumptions on particle sources and reflection properties are imposed. Elastic neutral collisions and ionization of neutrals escaping the gaps have no significant influence on the results. Nevertheless, particle-in-cell simulations of plasma penetration into gaps are essential for estimating the incoming ion flux and leading to a better quantitative agreement with experimental observations.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
ITER, TEXTOR, LIMITER, TRANSPORT, DIVERTOR
journal title
PLASMA PHYSICS AND CONTROLLED FUSION
Plasma Phys. Control. Fusion
volume
52
issue
7
article number
075007
pages
13 pages
Web of Science type
Article
Web of Science id
000278906200008
JCR category
PHYSICS, FLUIDS & PLASMAS
JCR impact factor
2.466 (2010)
JCR rank
6/31 (2010)
JCR quartile
1 (2010)
ISSN
0741-3335
DOI
10.1088/0741-3335/52/7/075007
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
1237480
handle
http://hdl.handle.net/1854/LU-1237480
date created
2011-05-25 11:37:48
date last changed
2016-12-21 15:42:01
@article{1237480,
  abstract     = {The Monte-Carlo neutral transport code 3D-GAPS is described. The code models impurity transport and deposition in remote areas, such as gaps between cells of castellated plasma-facing surfaces. A step-by-step investigation of the interplay of different processes that may influence the deposition inside gaps, namely particle reflection, elastic neutral collisions, different particle sources, chemical erosion and plasma penetration into gaps, is presented. Examples of modelling results in application to the TEXTOR experiment with a castellated test limiter are provided. It is shown that only with the assumption of the presence of species with different reflection probabilities, do simulated carbon deposition profiles agree with experimental observations for side surfaces of the gaps. These species can be attributed to different particle sources, e. g. carbon atoms and hydrocarbon radicals. Background carbon ions and atoms have low and moderate values of the reflection coefficient (R {\textlangle}= 0.6), while some of the hydrocarbon radicals produced by chemical erosion of redeposited carbon layers have high reflection probability (R {\textrangle}= 0.9). Deposition at the bottom of the gaps cannot be adequately reproduced unless extreme assumptions on particle sources and reflection properties are imposed. Elastic neutral collisions and ionization of neutrals escaping the gaps have no significant influence on the results. Nevertheless, particle-in-cell simulations of plasma penetration into gaps are essential for estimating the incoming ion flux and leading to a better quantitative agreement with experimental observations.},
  articleno    = {075007},
  author       = {Matveev, Dmitry and Kirschner, A and Litnovsky, A and Komm, M and Borodin, D and Philipps, V and Van Oost, Guido},
  issn         = {0741-3335},
  journal      = {PLASMA PHYSICS AND CONTROLLED FUSION},
  keyword      = {ITER,TEXTOR,LIMITER,TRANSPORT,DIVERTOR},
  language     = {eng},
  number       = {7},
  pages        = {13},
  title        = {Modelling of impurity deposition in gaps of castellated surfaces with the 3D-GAPS code},
  url          = {http://dx.doi.org/10.1088/0741-3335/52/7/075007},
  volume       = {52},
  year         = {2010},
}

Chicago
Matveev, Dmitry, A Kirschner, A Litnovsky, M Komm, D Borodin, V Philipps, and Guido Van Oost. 2010. “Modelling of Impurity Deposition in Gaps of Castellated Surfaces with the 3D-GAPS Code.” Plasma Physics and Controlled Fusion 52 (7).
APA
Matveev, D., Kirschner, A., Litnovsky, A., Komm, M., Borodin, D., Philipps, V., & Van Oost, G. (2010). Modelling of impurity deposition in gaps of castellated surfaces with the 3D-GAPS code. PLASMA PHYSICS AND CONTROLLED FUSION, 52(7).
Vancouver
1.
Matveev D, Kirschner A, Litnovsky A, Komm M, Borodin D, Philipps V, et al. Modelling of impurity deposition in gaps of castellated surfaces with the 3D-GAPS code. PLASMA PHYSICS AND CONTROLLED FUSION. 2010;52(7).
MLA
Matveev, Dmitry, A Kirschner, A Litnovsky, et al. “Modelling of Impurity Deposition in Gaps of Castellated Surfaces with the 3D-GAPS Code.” PLASMA PHYSICS AND CONTROLLED FUSION 52.7 (2010): n. pag. Print.