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  Optimization of pellet scenarios for long pulse fuelling to high densities at JET

Lang, P. T., Alper, B., Baylor, L. R., Beurskens, M., Cordey, J. G., Dux, R., et al. (2002). Optimization of pellet scenarios for long pulse fuelling to high densities at JET. Nuclear Fusion, 42(4), 388-402.

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Lang, P. T.1, Author           
Alper, B.2, Author
Baylor, L. R.2, Author
Beurskens, M.2, Author
Cordey, J. G.2, Author
Dux, R.3, Author           
Felton, R.2, Author
Garzotti, L.2, Author
Haas, G.1, 4, Author           
Horton, L. D.1, Author           
Jachmich, S.2, Author
Jones, T. T. C.2, Author
Lomas, P. J.2, Author
Lorenz, A.1, Author           
Maraschek, M.5, Author           
Müller, H. W.1, Author           
Ongena, J.2, Author
Rapp, J.2, Author
Reich, M.1, Author           
Renk, K. F.2, Author
Sartori, R.2, AuthorSchmidt, G.2, AuthorStamp, M.2, AuthorSuttrop, W.5, Author           Villedieu, E.2, AuthorEFDA-JET Work Programme Collaborators2, Author more..
1Experimental Plasma Physics 1 (E1), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856295              
2UKAEA 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, ou_persistent22              
3Experimental Plasma Physics 4 (E4), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856293              
4Technology (TE), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856318              
5Experimental Plasma Physics 2 (E2), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856292              


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 Abstract: 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.


Language(s): eng - English
 Dates: 2002-04
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 20729
ISI: 000175742700005
 Degree: -



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Title: Nuclear Fusion
  Alternative Title : Nucl. Fusion
Source Genre: Journal
Publ. Info: -
Pages: - Volume / Issue: 42 (4) Sequence Number: - Start / End Page: 388 - 402 Identifier: ISSN: 0029-5515