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ID: 20731.0, MPI für Plasmaphysik / Articles, Books, Inbooks
High density operation at JET by pellet refuelling
Authors:Lang, P. T.; Alper, B.; Baylor, L. R.; Beurskens, M.; Cordey, J. G.; Dux, R.; Felton, R.; Garzotti, L.; Haas, G.; Horton, L. D.; Jachmich, S.; Jones, T. T. C.; Lorenz, A.; Lomas, P. J.; Maraschek, M.; Müller, H. W.; Ongena, J.; Rapp, J.; Renk, K. F.; Reich, M.; Sartori, R.; Schmidt, G.; Stamp, M.; Suttrop, W.; Villedieu, E.; Wilson, D.; EFDA-JET Work Programme Collaborators
Date of Publication (YYYY-MM-DD):2002-09
Title of Journal:Plasma Physics and Controlled Fusion
Journal Abbrev.:Plasma Phys. Control. Fusion
Issue / Number:9
Start Page:1919
End Page:1928
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:Several approaches are used at JET to achieve operation at high density with good energy confinement. One of them is the injection of solid fuel pellets to realize efficient particle refuelling by deposition deep inside the plasma column. The new pellet launch system capable of launching from the torus magnetic high field side was investigated for its capability,to fulfil this task in conventional ELMy H-mode discharges. Optimized pellet. scenarios were developed for plasma configurations with I-p = 2.5 MA, B-t = 2.4 T, averaged triangularity <delta> approximate to 0.34 and mainly neutral beam heating at a level of approximately 17 MW. The accessible operational range. was extended by the pellet tool with respect to gas puff refuelling. For example, H-mode conditions could be maintained at densities beyond the Greenwald level. Plasma energy confinement was observed to become density independent at high densities. When avoiding confinement deterioration due to pellet triggered MHD activity or parasitic pellet born gas in appropriate pulse schedules, enhanced particle inventory with more peaked density profiles was achieved while maintaining the plasma pressure profile. First attempts indicate that pellet advantages can be combined with the benefits achieved by higher triangularity. Very high particle refuelling efficiencies were found for pellets injected into 'ITER-like' discharges with an upper triangularity <delta(u)> of 0.53
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Plasmaphysik/E1
External Affiliations:UKAEA Euratom Fus Assoc, Culham Lab, Abingdon OX14 3DB, Oxon, England; Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA; FOM, Inst Plasmafys Rijnhuizen, Nieuwegein, Netherlands; EURATOM, ENEA Fus, Consorzio RFX, I-35137 Padua, Italy; Assoc EURATOM Belgian State, LPP ERM KMS, B-1000 Brussels, Belgium; Forschungszentrum Jülich GMBH, Inst Plasmaphys, D-52425 Julich, Germany; Univ Regensburg, Inst Expt & Angew Phys, D-93040 Regensburg, Germany; EFDA CSU, D-85748 Garching, Germany; Princeton Univ, Princeton Plasma Phys Lab, Princeton, NJ 08544 US
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