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  Equilibria and stability of JET discharges with zero core current density

Stratton, B. C., Hawkes, N. C., Huysmans, G. T. A., Breslau, J. A., Zakharov, L. E., Alper, B., et al. (2003). Equilibria and stability of JET discharges with zero core current density. In Fusion Energy 2002. Vienna: International Atomic Energy Agency.

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 Creators:
Stratton, B. C.1, Author
Hawkes, N. C.1, Author
Huysmans, G. T. A.1, Author
Breslau, J. A.1, Author
Zakharov, L. E.1, Author
Alper, B.1, Author
Budny, R. V.1, Author
Challis, C. D.1, Author
De Angelis, R.1, Author
Drozdov, V.1, Author
Fenzi, C.1, Author
Giroud, C.1, Author
Hender, T. C.1, Author
Hobirk, J.2, Author              
Jardin, S. C.1, Author
Joffrin, E.1, Author
Lomas, P. J.1, Author
Lotte, P.1, Author
Mailloux, J.1, Author
Park, W.1, Author
Rachlew, E.1, AuthorReyes-Cortes, S.1, AuthorSolano, E.1, AuthorTala, T.1, AuthorZastrow, K.-D.3, Author              EFDA-JET Contributors, Author               more..
Affiliations:
1Princeton Plasma Physics Laboratory, Princeton, NJ, USA; Euratom/UKAEA Fusion Association, Culham Science Centre, Abingdon, UK; Association Euratom-CEA, Cadarache, France; Association Euratom-ENEA sulla Fusione, CRE Frascati, Roma, Italy; FOM-Institut voor Plasmafysica "Rijnhiuzen", Associatie EURATOM-FOM, Niewgen, The Netherlands; KTH-Physics, SCFAB, VR Association, Stockholm, Sweden; Euratom/IST Association, Centro de Fusao Nuclear, Lisboa, Portugal; Association EURATOM-CIEMAT para Fusion, CIEMAT, Spain and EFDA CSU JET, Abingdon, UK; Association Euratom-TEKES, VTT Chemical Technology, Espoo, Finland, ou_persistent22              
2Experimental Plasma Physics 1 (E1), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856295              
3Experimental Plasma Physics 4 (E4), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856293              

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 Abstract: Injection of Lower Hybrid Heating and Current Drive (LHCD) into the current ramp-up phase of JET discharges has produced extremely reversed q-profiles characterized by a core region of near zero current density (within Motional Stark Effect diagnostic measurement errors). Non-inductive, off-axis co-current drive induces a back electromotive force inside the non-inductive current radius that drives a negative current in the plasma core. The core current density does not go negative, although current diffusion calculations indicate that there is sufficient LHCD to cause this. A possible explanation of the core current density clamping near zero is that MHD instabilities redistribute the core current soon after it goes negative. This is seen in reduced MHD simulations in cylindrical geometry and nonlinear resistive MHD simulations in toroidal geometry which predict that these discharges undergo n=0 reconnection events which clamp the core current near zero. Understanding the physics of the current hole in present devices is important for enabling predictions of current profile evolution in next step facilities with strong non-inductive current drive.

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Language(s): eng - English
 Dates: 2003
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: Internal
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Title: 19th Fusion Energy Conference
Place of Event: Lyon (FR)
Start-/End Date: 2002-10-14 - 2002-10-19

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Title: Fusion Energy 2002
Source Genre: Proceedings
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Publ. Info: Vienna : International Atomic Energy Agency
Pages: CD-ROM Volume / Issue: - Sequence Number: EX/C3-1Rb Start / End Page: - Identifier: -