The Role of Aspect Ratio and Beta in H-mode Confinement Scalings

Kaye, S. M. ; Valovic, M. ; Chudnovskiy, A. ; Cordey, J. G. ; McDonald, D. ; Meakins, A. ; Thomsen, K. ; Akers, R. ; Bracco, G. ; Brickley, C. ; Bush, C. ; Cote, A. ; DeBoo, J. C. ; Greenwald, M. ; Hoang, G. T. ; Hogweij, D. ; Imbeaux, F. ; Kamada, Y. ; Kardaun, O.J. W.F. ; Kus, A. ; Lebedev, S. ; Leonov, V. ; Lynch, S. ; Martin, Y. ; Miura, Y. ; Ongena, J. ; Pacher, G. ; Petty, C. C. ; Romanelli, M. ; Ryter, F. ; Shinohara, K. ; Snipes, J. ; Stober, J. ; Takizuka, T. ; Tsuzuki, K. ; Urano, H.

Princeton University. Plasma Physics Laboratory.

关键词: Iaea;    70 Plasma Physics And Fusion Technology;    H-Mode;    Physics;    Confinement;   

RP-ID  :  PPPL-4121
RP-ID  :  DE-AC02-76CH03073
RP-ID  :  899588

美国|英语

来源: UNT Digital Library

【 摘 要 】

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 ? and M(sub)eff appropriate to ITER operation. Development of scalings using engineering parameters as predictor variables results in ?-scaling coefficients that range from 0.38 to 1.29; the transformation of these scalings to physics variables results in an unfavorable dependence of ?? on ?, but a favorable dependence on ?. Because the low aspect ratio devices operate at low ?(sub)T and therefore high ?(sub)T, a strong correlation exists between ? and ?, and this makes scalings based on physics variables imprecise.