The effect of transient density profile shaping on transport in large stellarators and heliotrons

A. Dinklage, R. Sakamoto, M. Yokoyama, K. Ida, J. Baldzuhn, C. D. Beidler, S. Cats, K.J. Mc Carthy, J. Geiger, M. Kobayashi, H. Maaßberg, S. Morita, G. Motojima, M. Nakata, M. Nunami, N. Pablant, K. Ogawa, J.H.E. Proll, S. Satake, K. TanakaF. Warmer, R.C. Wolf, P. Xanthopoulos, H. Yamada, R. Yasuhara, M. Yoshinuma

Research output: Contribution to journalArticleAcademicpeer-review

6 Citations (Scopus)

Abstract

Transport studies of pellet fuelling experiments on LHD are reported. Spatio-temporal evolutions after pellet injection into LHD discharges show cases where central density increases on the time scale of particle transport processes. Both the temperature gradient and the density gradient change during the density relaxation, the latter even in sign. The resulting thermodynamic forces influence radial electric fields - both as a driving term but also by, e.g. affecting the E r dependence of ion transport. Magnetic fluctuations have been found to be induced by pellet injection but die out with the relaxation of the pressure profile.

Original languageEnglish
Article number066016
Number of pages6
JournalNuclear Fusion
Volume57
Issue number6
DOIs
Publication statusPublished - Jun 2017

Keywords

  • density control
  • fueling
  • heliotrons
  • stellarators

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