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          Institute: MPI für Plasmaphysik     Collection: Articles, Books, Inbooks     Display Documents

ID: 20486.0, MPI für Plasmaphysik / Articles, Books, Inbooks
Helium and neon enrichment studies in the JET mark IIAP and mark IIGB divertors
Authors:Groth, M.; Andrew, P.; Fundamenski, W.; Guo, H. Y.; Hillis, D. L.; Hogan, J. T.; Horton, L. D.; Matthews, G. F.; Meigs, A. G.; Morgan, P. D.; Stamp, M. F.; Stork, D.; von Hellermann, M.
Date of Publication (YYYY-MM-DD):2002-05
Title of Journal:Nuclear Fusion
Journal Abbrev.:Nucl. Fusion
Issue / Number:5
Start Page:591
End Page:600
Review Status:Peer-review
Audience:Experts Only
Abstract / Description: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.
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Plasmaphysik/E1
External Affiliations:EURATOM, 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
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