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

ID: 20729.0, MPI für Plasmaphysik / Articles, Books, Inbooks
Optimization of pellet scenarios for long pulse fuelling to high densities at JET
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.; Lomas, P. J.; Lorenz, A.; Maraschek, M.; Müller, H. W.; Ongena, J.; Rapp, J.; Reich, M.; Renk, K. F.; Sartori, R.; Schmidt, G.; Stamp, M.; Suttrop, W.; Villedieu, E.; EFDA-JET Work Programme Collaborators
Date of Publication (YYYY-MM-DD):2002-04
Title of Journal:Nuclear Fusion
Journal Abbrev.:Nucl. Fusion
Issue / Number:4
Start Page:388
End Page:402
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:Pellet injection was investigated for its fuelling capability to high densities in ELMy H mode discharges at JET. Applying the high field side launch system, optimized refuelling scenarios were developed on the basis of conventional discharge 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 with respect to gas puff refuelling by the use of pellet injection. 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. Deep pellet particle deposition made possible the uncoupling of edge and core density, allowing more peaked density profiles. When confinement deterioration due to pellet triggered MHD activity or parasitic pellet borne gas was avoided in appropriate pulse schedules, an enhanced particle inventory was achieved while maintaining the plasma pressure profile. In a technical assessment it was found that there is still room for further enhancement of the injection scenario by improved adaptation to high density plasma operation.
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Plasmaphysik/E1
External Affiliations:UKAEA Euratom Fus Assoc, Abingdon, Oxon, England; Oak Ridge Natl Lab, Oak Ridge, TN USA; FOM, Inst Plasmafys Rijnhuizen, Nieuwegein, Netherlands; Assoc Euratom ENEA Fus, Consorzio RFX, Padua, Italy; Assoc Euratom Belgian State, ERM KMS, Plasma Phys Lab, Brussels, Belgium; KFA Jülich GmbH, Forschungszentrum, Inst Plasmaphys, Jülich, Germany; Univ Regensburg, Inst Expt & Angew Phys, D-8400 Regensburg, Germany; European Fus Dev Agreement Close Support Unit, Garching, Germany; Princeton Univ, Princeton Plasma Phys Lab, Princeton, NJ 08543 USA
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