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5 th CWGM July 6-8 2009 Institut für Plasmaforschung Universität Stuttgart

Experiment results from LHD Background E r effect Island in LHD Island in TJ-II. 5 th CWGM July 6-8 2009 Institut für Plasmaforschung Universität Stuttgart. Iota/shear effects session. Experiment results from LHD. Y. NARUSHIMA (NIFS) -Background

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5 th CWGM July 6-8 2009 Institut für Plasmaforschung Universität Stuttgart

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  1. Experiment results from LHD Background Er effect Island in LHD Island in TJ-II 5th CWGM July 6-8 2009 Institut für Plasmaforschung Universität Stuttgart Iota/shear effects session Experiment results from LHD Y. NARUSHIMA (NIFS) -Background -Effect of radial electric field on island -Dynamics of magnetic island from LHD -Island behavior in CERC form TJ-II 1/8

  2. Experiment results from LHD Background Er effect Island in LHD Island in TJ-II 5th CWGM July 6-8 2009 Institut für Plasmaforschung Universität Stuttgart Experiment results from LHD Background Previous experiment observation -Growth and healing depends on b and n -Nonlinear behavior 2/8

  3. Experiment results from LHD Background Er effect Island in LHD Island in TJ-II 5th CWGM July 6-8 2009 Institut für Plasmaforschung Universität Stuttgart Experiment results from LHD BS and PS currents cannot explain behavior of island in LHD PS current (HINT) BS current Another effect should be considered. Poloidal flow -- Drag of magnetic island [Y. Ishii, et al., PFR 3 (2008) 048] Ion-polarization current [A. I. Smolyakov, et al., PoP 9 (2002) 371] [R. Fitzpatrick, et al., PoP 13 (2006) 122507] Radial electric field might be a key parameter 3/8

  4. Experiment results from LHD Background Er effect Island in LHD Island in TJ-II 5th CWGM July 6-8 2009 Institut für Plasmaforschung Universität Stuttgart Experiment results from LHD Radial electric field effect Theoretical prediction Index of polarization current effectapc [K. Itoh, et al., PoP 12 (2005) 072512] apc= w(w - w*pi)w*pi-2 w = -wEB = EB/(rsB2) Relative velocity of EBdrift w*pi = Bpi/(rsniqiB) Ion diamagnetic drift Er > 0 : Stabilizing Er < 0 : |Er| > |pi/(niqi)|Stabilizing |Er| < |pi/(niqi)|Destabilizing 4/8

  5. Experiment results from LHD Background Er effect Island in LHD Island in TJ-II 5th CWGM July 6-8 2009 Institut für Plasmaforschung Universität Stuttgart Experiment results from LHD Er < 0 (Ion root) [M. Yokoyama, et al., NF 42 (2002) 143 ] Tentative It seems that |Er| increases with b. 5/8

  6. Experiment results from LHD Background Er effect Island in LHD Island in TJ-II 5th CWGM July 6-8 2009 Institut für Plasmaforschung Universität Stuttgart Experiment results from LHD Healing Growth Tentative Ion root Contribution of ion diamagnetic drift? 6/8

  7. Experiment results from LHD Background Er effect Island in LHD Island in TJ-II 5th CWGM July 6-8 2009 Institut für Plasmaforschung Universität Stuttgart CERC dTe/dr~ 0 dTe/dr 0 Experiment results from LHD CERC in TJ-II [F. Castejón, et al., 35th EPS 32D, P-1.025 (2008)] "The island healing is produced just simultaneously to the CERC onset." Er > 0 (Electron root) : stabilizing 7/8

  8. Experiment results from LHD Background Er effect Island in LHD Island in TJ-II Intention 5th CWGM July 6-8 2009 Institut für Plasmaforschung Universität Stuttgart Experiment results from LHD Relationship between Er (Ti) and island. Er and Ti may be measured in LHD experiment in October. Some relevance of island and CERC might bring worthwhile information Narushima wants Castejón to teach some theories about that. 8/8

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