Blob properties in L- and H-mode from gas-puff imaging in ASDEX upgrade

作     者：Fuchert, G. Birkenmeier, G. Carralero, D. Lunt, T. Manz, P. Mueller, H. W. Nold, B. Ramisch, M. Rohde, V. Stroth, U. 

作者机构：Univ Lorraine Inst Jean Lamour CNRS UMR 7198 F-54506 Vandoeuvre Les Nancy France Max Planck Inst Plasma Phys D-85748 Garching Germany Univ Stuttgart Inst Grenzflachenverfahrenstech & Plasmatechnol D-70569 Stuttgart Germany Tech Univ Munich Phys Dept E28 D-85748 Garching Germany 

出 版 物：《PLASMA PHYSICS AND CONTROLLED FUSION》 (等离子体物理学与受控聚变)

年 卷 期：2014年第56卷第12期

页      面：125001-125001页

核心收录：

学科分类：07[理学] 070204[理学-等离子体物理] 0702[理学-物理学] 

基　　金：Euratom research and training programme 

主　　题：tokamak plasma turbulence blobs gas-puff imaging 

摘      要：Blob properties are studied in the scrape-off layer of the tokamak ASDEX Upgrade with a fast camera. The gas-puff imaging technique is used to investigate the detection rate as well as the blob size and velocity scaling. The experiments were performed in L-and H-mode phases of the same discharges to study the change in blob properties after the L-H transition. In both regimes the detection rate is of the order of a few thousand blobs per second, which is compatible with the picture of blob generation by edge micro instabilities. The blob size increases in H-mode, while the radial velocity decreases slightly. The changes are, however, not indicating a drastic change in the blob dynamics in both phases. The experimentally found blob properties were compared to predictions from a novel blob model including effects due to a finite ion temperature, which should be more appropriate for the conditions in the SOL of fusion plasmas.