Abstract This presentation examines the energetic particle transport induced by saturated kink modes and sawtooth crashes in JET deuterium plasmas. It is known that kink mode-resonant transport and phase-space redistribution from sawtooth crashes can drive strong fast ion transport with dependencies on particle pitch and energy. Measurements with JET’s Faraday cup fast ion loss detector array have shown that the internal kink growth phase preceding sawtooth crashes produces substantial fast ion losses. This report will numerically investigate the dominant energetic particle transport mechanism with a detailed examination of the fast ion phase-space dependencies, resonances, orbit topology changes, induced losses, and redistribution associated with the long-lived, resonant, kink mode and non-resonant sawtooth crash. The ORBIT-kick model forms the basis of the transport studies with realistic fast ion distributions produced from TRANSP. A recently created reduced model for sawtooth induced transport is used while the saturated kink modes are modeled with ideal magnetohydrodynamic codes. The simulations were further validated against experiment with a newly developed synthetic Faraday cup fast ion loss detector in addition to scintillator probe and neutron measurements.

Sawtooth wave

Kink instability

10.1088/1741-4326/ac888c

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Pedestal confinement in hybrid versus baseline plasmas in JET

L. Frassinetti M. Beurskens D. C. McDonald J. Hobirk D. Zarzoso

JET-EFDA, Culham Science Centre, OX14 3DB, Abingdon, UK 1 Division of Fusion Plasma Physics, Association EURATOM-VR , Alfven Laboratory, School of Electrical Engineering, Royal Institute of Technology KTH, SE-10044 Stockholm, Sweden. EURATOM /CCFE Fusion Association, Culham Sc. Centre, Abingdon, OX14 3DB, UK. Association EURATOM-Max-Planck-Institut fur Plasmaphysik, D-85748 Garching, Germany. CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France. Associazione EURATOM -ENEA sulla Fusione, C.R. Frascati, Frascati, Italy. Association EURATOM-Tekes, Helsinki University of Technology, Finland. Centro de Fusao Nuclear, Associacao EURATOM-IST, Lisboa, Portugal. FUSION FOR ENERGY Joint Undertaking, 08019 Barcelona, Spain. *See the Appendix of F. Romanelli et al., Proceedings of the 22nd IAEA Fusion Energy Conference 2008, Geneva, Switzerland

Atomic Energy

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Tritium fast ion distribution in JET current hole plasmas

Plasma Physics and Controlled Fusion (2005)

N. Hawkes V.A. Yavorskij J. M. Adams Y. Baranov L. Bertalot

Current hole plasmas in JET are those in which the current density within r/a < 0.3 is close to zero. Tritium ions injected quasi-tangentially into such plasmas can fulfil a stagnation condition whereby their vertical drift is cancelled by the poloidal component of their parallel velocity. These ions remain trapped at approximately 0.2 m from the plasma axis and can be detected by a distortion in the neutron emission profile. Numerical modelling of the steady-state distribution reproduces the experimental results while the decay of neutron emission after the cessation of injection is found to be sensitive to small changes in the q-profile.

10.1088/0741-3335/47/9/008

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Implication of Absolute Calibration for Michelson Interferometer ECE Diagnostic at JET for ITER

S. Schmuck J. Fessey L. Figini Jet Contributors

Absolute (philosophy)

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Optimization of ICRH for tungsten control in JET H-mode plasmas

41st EPS Conference on Plasma Physics (2014)

M. Goniche E. Lerche Philippe Jacquet D. Van Eester V. Bobkov

1 CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France. Association EURATOM-Belgian State, LPP-ERM-KMS, TEC partner, Brussels, Belgium Euratom/CCFE Fusion Association, Culham Science Centre, Abingdon, OX14 3DB, UK Max-Planck-Institut fur Plasmaphysik, EURATOM-Assoziation, Garching, Germany Forschungszentrum Julich, EURATOM Association, Julich, Germany Association Euratom-IPPLM, Hery 23, 01-497 Warsaw, Poland

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Experimental analysis of ELM and inter-ELM particle transport in JET-ILW pedestals

L. Horváth M. Maslov P. A. Schneider L. Frassinetti C. F. Maggi

Particle (ecology)

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Validation of reduced-order turbulence modelling in the tokamak L-mode near-edge

G. Snoep J. Citrin C. Bourdelle F. Jenko A. Ho

Mode (computer interface)

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