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  High density operation at JET by pellet refuelling

Lang, P. T., Alper, B., Baylor, L. R., Beurskens, M., Cordey, J. G., Dux, R., et al. (2002). High density operation at JET by pellet refuelling. Plasma Physics and Controlled Fusion, 44(9), 1919-1928.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-4094-F Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-4095-D
Genre: Journal Article

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 Creators:
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
Lorenz, A.1, Author              
Lomas, P. J.2, Author
Maraschek, M.5, Author              
Müller, H. W.1, Author              
Ongena, J.2, Author
Rapp, J.2, Author
Renk, K. F.2, Author
Reich, M.1, Author              
Sartori, R.2, AuthorSchmidt, G.2, AuthorStamp, M.2, AuthorSuttrop, W.5, Author              Villedieu, E.2, AuthorWilson, D.2, AuthorEFDA-JET Work Programme Collaborators2, Author more..
Affiliations:
1Experimental Plasma Physics 1 (E1), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856295              
2UKAEA 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, 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: 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

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Language(s): eng - English
 Dates: 2002-09
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: eDoc: 20731
ISI: 000178415900011
 Degree: -

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Title: Plasma Physics and Controlled Fusion
  Alternative Title : Plasma Phys. Control. Fusion
Source Genre: Journal
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Pages: - Volume / Issue: 44 (9) Sequence Number: - Start / End Page: 1919 - 1928 Identifier: ISSN: 0741-3335