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

ID: 56106.0, MPI für Plasmaphysik / Articles, Books, Inbooks
Mass transfer in long pellet guiding systems at ASDEX Upgrade and JET
Authors:Lorenz, A.; Combs, S.; Reich, M.; Lang, P. T.; Watson, M.; Wilson, D.; Wittmann, C.
Research Context:22nd Symposium on Fusion Technology (SOFT 2002), Helsinki, 2002-09-09 to 2002-09-13
Date of Publication (YYYY-MM-DD):2003
Title of Journal:Fusion Engineering and Design
Journal Abbrev.:Fusion Eng. Des.
Issue / Number:1-4
Start Page:15
End Page:20
Copyright:Copyright © 2003 Elsevier B.V. All rights reserved
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:Guiding systems used for transfer of cryogenic pellets to the tokamak inboard currently undergo optimisation to possibly extend the operational range of Inboard pellet injection scenarios. Work reported here has been concentrating on experimental studies and calculations of pellet mass loss during transfer in a guiding tube as a function of pellet parameters such as velocity and ice composition, and guiding track characteristics such as vacuum conductance, geometry, size and shape of cross-section. Results from ASDEX Upgrade and ORNL systems suggest, that centripetal loads on the pellets due to small radii bends in the systems strongly increase the erosion of pellet ice. A deleterious effect of accumulated gas due to sublimated D₂-ice blocking the tube and eroding subsequent pellets has been found. However, an efficient vacuum pumping set up for a given pellet repetition rate can significantly improve the mass conservation with respect to closed tube systems.
Free Keywords:Pellet guiding systems; ASDEX; JET; Mass loss
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Plasmaphysik/Tokamak Scenario Development (E1)
External Affiliations:EFDA JET Culham, Culham Science Centre, Oxford OX14 3DB, UK; UKAEA Culham, Culham Science Centre, Oxford OX14 3DB, UK; Oak Ridge National Laboratory, Oak Ridge, TN 37831-8071, USA
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