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  Helium and neon enrichment studies in the JET mark IIAP and mark IIGB divertors

Groth, M., Andrew, P., Fundamenski, W., Guo, H. Y., Hillis, D. L., Hogan, J. T., et al. (2002). Helium and neon enrichment studies in the JET mark IIAP and mark IIGB divertors. Nuclear Fusion, 42(5), 591-600.

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 Creators:
Groth, M.1, Author
Andrew, P.1, Author
Fundamenski, W.1, Author
Guo, H. Y.1, Author
Hillis, D. L.1, Author
Hogan, J. T.1, Author
Horton, L. D.2, Author              
Matthews, G. F.1, Author
Meigs, A. G.1, Author
Morgan, P. D.1, Author
Stamp, M. F.1, Author
Stork, D.1, Author
von Hellermann, M.1, Author
Affiliations:
1EURATOM, UKAEA Fus Assoc, Abingdon, Oxon, England; Univ Manchester, Manchester, Lancs, England; Univ Washington, Redmond Plasma Phys Lab, Redmond, WA USA; Oak Ridge Natl Lab, Oak Ridge, TN USA; FOM, Inst Plasma Phys, Nieuwegein, Netherlands, ou_persistent22              
2Experimental Plasma Physics 1 (E1), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856295              

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 Abstract: Adequate helium enrichment and exhaust have been achieved in reactor relevant ELMy H mode plasmas in JET performed in the Mark II divertor geometry. These quantities, describing the retention of impurities in divertors, have been experimentally inferred from CXRS measurements in the core plasma, and from a spectroscopic analysis of a Penning gauge discharge in the exhaust gas. The retention of helium was found to be sufficient with respect to the requirements in a next step device, with helium enrichment factors exceeding 0.1 in high density ELMy H mode discharges. With increasing core plasma density the helium partial pressure in the exhaust channel increases. While in L mode plasmas the helium enrichment decreases with increasing core plasma density, it remains almost constant in ELMy H mode plasma. The noble gas neon is better enriched in the divertor at high core plasma densities in both confinement regimes. These experimental results can be explained by the significant differences between the penetration depths of the impurity neutrals and by their subsequent different impurity transport mechanisms. Analytical and numerical analyses of these plasmas using the impurity code package DIVIMP/NIMBUS support the proposition that, owing to their much longer ionization mean free path, helium particles can escape from the divertor chamber as neutrals, while neon escapes by means of ion leakage. Consequently, the divertor plasma conditions strongly influence the noble gas compression and enrichment. Variations of the divertor plasma configuration and modifications to the divertor geometry have enhanced the pumping capabilities of the tokamak, but have been found not to affect the helium enrichment.

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Language(s): eng - English
 Dates: 2002-05
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 20486
ISI: 000176429800011
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Title: Nuclear Fusion
  Alternative Title : Nucl. Fusion
Source Genre: Journal
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Pages: - Volume / Issue: 42 (5) Sequence Number: - Start / End Page: 591 - 600 Identifier: ISSN: 0029-5515