The Role of Aspect Ratio and Beta in H-mode Confinement Scalings
Authors: S.M. Kaye, M. Valovic, A. Chudnovskiy, J.G. Cordey, D. McDonald, A. Meakins, K. Thomsen, R. Akers, G. Bracco, C. Brickley, C. Bush, A. Cote, J.C. DeBoo, M. Greenwald, G.T. Hoang, D. Hogweij, F. Imbeaux, Y. Kamada, O.J.W.F. Kardaun, A. Kus, S. Lebedev, V. Leonov, S. Lynch, Y. Martin, Y. Miura, J. Ongena, G. Pacher, C.C. Petty, M. Romanelli, F. Ryter, K. Shinohara, J. Snipes, J. Stober, T. Takizuka, K. Tsuzuki, and H. Urano
Date of PPPL Report: October 2005
Published in: Plasma Physics & Controlled Fusion 48, A429-38
Presented at the IAEA Technical Meeting on H-mode Physics and Transport Barriers, 28 - 30 September 2005, St. Petersburg, Russia.
The addition of high power, low aspect ratio data from the NSTX and MAST experiments have motivated a new investigation of the effect of aspect ratio on confinement scaling. Various statistical methods, including those that incorporate estimates of measurement error, have been applied to datasets constrained by the standard set of criteria in addition to the range of κ and Meff appropriate to ITER operation. Development of scalings using engineering parameters as predictor variables results in ε-scaling coefficients that range from 0.38 to 1.29; the transformation of these scalings to physics variables results in an unfavorable dependence of Βτ on β, but a favorable dependence on ε. Because the low aspect ratio devices operate at low ΒT and therefore high βT, a strong correlation exists between ε and β, and this makes scalings based on physics variables imprecise.