Magnetic configuration effects on turbulence driven transport from lhd and w7x identical experiments

K. TANAKA,M. NUNAMI,M. NAKATA,T. TSUJIMURA,M. YOSHINUMA,H. IGAMI,Y. YOSHIMURA,H. TAKAHASHI, R. YANAI,T. SHIMOZUMA,M. YOKOYAMA,R. SEKI,S. SATAKE,H. SUGAMA, T., TOKUZAWA,R. YASUHARA,Y. TAKEMURA, H. FUNAMBA, I. YAMADA,K. IDA,B. PETERSON, Y. SUZUKI,S. KUBO,C. SUZUKI, M. OASKABE,T. MORISAKI,F. WARMER,P. XANTHOPOULOS, G. G., PLUNK,M. N. A. BEURSKENS,G. M. WEIR,P. HELANDER,C. D. BEIDLER,T. STANGE, H. M. SMITH,D. ZHANG,Y. TURKIN, J. BRUNNER, A. STECHOW,J. GEIGER,A. LANGENBERG,E. PASCH, G., FUCHERT,S. BOZHENKOV, E. SCOTT,H. LAQUA,R. C. WOLF,Y. OHTANI,H. YAMADA,N. PABLANT

semanticscholar（2021）

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Abstract

Characteristics of the turbulence driven transports are investigated in LHD and W7-X. The gyrokinetic non-linear simulation with identical input gradient shows lower ETG driven transport in W7-X and lower ITG driven transport in LHD. The configuration scan experiments in LHD shows that reduced transport associated with reduction of ion scale turbulence at inwardly shifted configuration, where effective helical ripple is low. The identical experiment between W7-X and LHD with similar density and heating power shows clear different density and temperature profiles. Total transport is lower in W7-X at most of the radial location, however, anomalous contribution is lower in LHD. The reduced ion transport in LHD qualitatively agree with gyrokinetic simulation. The effective helical ripple is not ruling parameter to reduce anomalous transport among stellarator/heliotron configuration.

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