Advanced

Method for experimental determination of Z dependence of impurity transport on JET

Giroud, C.; Barnsley, R.; Buratti, P.; Coffey, I. H.; von Hellermann, M.; Jupén, Christer LU ; Lawson, K. D.; Meigs, A.; O'Mullane, M. and Whiteford, A. D., et al. (2007) In Nuclear Fusion 47(4). p.313-330
Abstract
The prediction of impurity peaking in future fusion devices such as ITER necessitates the study of the dependence on Z of the impurity transport in present devices. In this paper we describe a novel technique to determine the transport of impurities with different atomic numbers independently. A technique has been developed that allows simultaneously the measurement of the transport of Ne and Ar in the same discharge while minimizing the systematic errors in the spectroscopic measurements. The reproduction of the charge-exchange measured densities, absolute vaccum ultra-violet line intensities and absolute soft x-ray intensity is achieved in an impurity transport simulation. The method used to estimate the errors on the transport... (More)
The prediction of impurity peaking in future fusion devices such as ITER necessitates the study of the dependence on Z of the impurity transport in present devices. In this paper we describe a novel technique to determine the transport of impurities with different atomic numbers independently. A technique has been developed that allows simultaneously the measurement of the transport of Ne and Ar in the same discharge while minimizing the systematic errors in the spectroscopic measurements. The reproduction of the charge-exchange measured densities, absolute vaccum ultra-violet line intensities and absolute soft x-ray intensity is achieved in an impurity transport simulation. The method used to estimate the errors on the transport coefficients of neon (Ne) and argon (Ar) is presented. In the plasma region where the diffusion and convection coefficients are determined for hybrid discharges, the transport of Ne and Ar is observed to exceed neoclassical predictions. In the same regions, the diffusion coefficients of both impurities are similar. The convection coefficients are also comparable for Ne and Ar. The peaking of Ne and Ar density profiles are comparable during the period where the intermittent slow reconnecting n = 1 mode is stable in these hybrid discharges. (Less)
Please use this url to cite or link to this publication:
author
, et al. (More)
(Less)
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Nuclear Fusion
volume
47
issue
4
pages
313 - 330
publisher
IOP Publishing
external identifiers
  • wos:000246415400010
  • scopus:34047157274
ISSN
1741-4326
DOI
10.1088/0029-5515/47/4/010
language
English
LU publication?
yes
id
fb00a6f7-acf9-4c2b-84d1-0925ee50b160 (old id 664453)
date added to LUP
2007-12-07 12:12:54
date last changed
2017-08-27 03:54:35
@article{fb00a6f7-acf9-4c2b-84d1-0925ee50b160,
  abstract     = {The prediction of impurity peaking in future fusion devices such as ITER necessitates the study of the dependence on Z of the impurity transport in present devices. In this paper we describe a novel technique to determine the transport of impurities with different atomic numbers independently. A technique has been developed that allows simultaneously the measurement of the transport of Ne and Ar in the same discharge while minimizing the systematic errors in the spectroscopic measurements. The reproduction of the charge-exchange measured densities, absolute vaccum ultra-violet line intensities and absolute soft x-ray intensity is achieved in an impurity transport simulation. The method used to estimate the errors on the transport coefficients of neon (Ne) and argon (Ar) is presented. In the plasma region where the diffusion and convection coefficients are determined for hybrid discharges, the transport of Ne and Ar is observed to exceed neoclassical predictions. In the same regions, the diffusion coefficients of both impurities are similar. The convection coefficients are also comparable for Ne and Ar. The peaking of Ne and Ar density profiles are comparable during the period where the intermittent slow reconnecting n = 1 mode is stable in these hybrid discharges.},
  author       = {Giroud, C. and Barnsley, R. and Buratti, P. and Coffey, I. H. and von Hellermann, M. and Jupén, Christer and Lawson, K. D. and Meigs, A. and O'Mullane, M. and Whiteford, A. D. and Zastrow, K.-D.},
  issn         = {1741-4326},
  language     = {eng},
  number       = {4},
  pages        = {313--330},
  publisher    = {IOP Publishing},
  series       = {Nuclear Fusion},
  title        = {Method for experimental determination of Z dependence of impurity transport on JET},
  url          = {http://dx.doi.org/10.1088/0029-5515/47/4/010},
  volume       = {47},
  year         = {2007},
}