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.; 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,

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

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Lang, P. T.
Experimental Plasma Physics 1 (E1), Max Planck Institute for Plasma Physics, Max Planck Society;

/persons/resource/persons108992

Dux, R.
Experimental Plasma Physics 4 (E4), Max Planck Institute for Plasma Physics, Max Planck Society;

/persons/resource/persons109263

Haas, G.
Experimental Plasma Physics 1 (E1), Max Planck Institute for Plasma Physics, Max Planck Society;
Technology (TE), Max Planck Institute for Plasma Physics, Max Planck Society;

/persons/resource/persons109446

Horton, L. D.
Experimental Plasma Physics 1 (E1), Max Planck Institute for Plasma Physics, Max Planck Society;

/persons/resource/persons109838

Lorenz, A.
Experimental Plasma Physics 1 (E1), Max Planck Institute for Plasma Physics, Max Planck Society;

/persons/resource/persons109880

Maraschek, M.
Experimental Plasma Physics 2 (E2), Max Planck Institute for Plasma Physics, Max Planck Society;

/persons/resource/persons110002

Müller, H. W.
Experimental Plasma Physics 1 (E1), Max Planck Institute for Plasma Physics, Max Planck Society;

/persons/resource/persons110234

Reich, M.
Experimental Plasma Physics 1 (E1), Max Planck Institute for Plasma Physics, Max Planck Society;

/persons/resource/persons110609

Suttrop, W.
Experimental Plasma Physics 2 (E2), Max Planck Institute for Plasma Physics, Max Planck Society;

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Citation

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.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0027-413E-B

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.