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(CT/P-04) Multi-Machine Global Confinement and H-mode Threshold Analysis

J.A. Snipes¹⁾, M. Greenwald¹⁾, F. Ryter²⁾, O.J.W.F. Kardaun²⁾, J. Stober²⁾, M. Valovic³⁾, S.J. Fielding³⁾, A. Sykes³⁾, A. Dnestrovskij³⁾, M. Walsh³, J.C. DeBoo⁴, T.N. Carlstrom⁴⁾, G. Bracco⁵⁾, E. Righi⁶⁾, R. Sartori⁶⁾, J.G. Cordey⁶⁾, K. Thomsen⁶⁾, D. McDonald⁶⁾, Y. Miura⁷⁾, T. Takizuka⁷⁾, T. Fukuda⁷⁾, Y. Kamada⁷⁾, K. Shinohara⁷⁾, K. Tsuzuki⁷⁾, H. Urano⁷⁾, S.M. Kaye⁸⁾, C. Bush⁹⁾, Y. Martin¹⁰⁾, A. Cote¹¹⁾, G. Pacher¹¹⁾, J. Ongena¹²⁾, S. Lebedev¹³⁾, V. Leonov¹⁴⁾, A. Chudnovskiy^14)
 
1) MIT Plasma Science and Fusion Center, Cambridge, MA, USA.
²⁾ Max-Planck Inst. für Plasmaphysik, Garching, Germany
³⁾ UKAEA Association Euratom, Culham, UK
⁴⁾ General Atomics, San Diego, CA, USA
⁵⁾ Associazione Euratom-ENEA sulla fusione, Frascati, Italy
⁶⁾ EFDA-JET, Culham, UK or Garching, Germany
⁷⁾ Naka Fusion Research Establishment, Japan Atomic Energy Research Institute, Naka-machi, Naka-gun, Ibaraki-ken, Japan
⁸⁾ Princeton Plasma Physics Laboratory, Princeton, NJ, USA
⁹⁾ Oak Ridge National Laboratory, Oak Ridge, TN, USA
¹⁰⁾ EPFL/CRPP Association Euratom, Lausanne, Switzerland
¹¹⁾ Centre Canadien de Fusion Magnetique, Varennes, Quebec, Canada
¹²⁾ LPP/ERM-KMS, Association EURATOM-Belgian State, Brussels, Belgium
¹³⁾ A F Ioffe Institute, Russian Academy of Sciences, St Petersburg, Russia
¹⁴⁾ Nuclear Fusion Institute, Russian Research Centre Kurchatov Institute, Moscow, Russia

Abstract.  The ITPA Confinement and H-mode Threshold Database Working Groups analyze global parameters from a number of tokamaks worldwide to better understand the physics of energy confinement in a tokamak and of the transition between L- and H-mode. High density data from ASDEX-Upgrade, DIII-D, and JET indicate that with peaked density profiles it is possible to maintain good global energy confinement (H98y2 $\sim$ 1) up to and beyond the Greenwald density limit even though the loss power does not exceed the H-mode threshold power scaling. The dependence of confinement on plasma shape will be analyzed in detail by examining the residuals of triangularity and other shaping factors. The new low aspect ratio MAST data in the threshold database permits initial regressions to be made including the aspect ratio, showing a moderate negative aspect ratio (R/a) dependence. Recent analyses of the increase in the threshold at low q₉₅ and higher Z_eff will also be presented.

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