Reactor-relevant quiescent H-mode operation using torque from non-axisymmetric, non-resonant magnetic fields

• DOI: 10.1063/1.3695119
• Publication Date: 2012-04-21T22:53:57Z
• Authors: K. H. Burrell; A. M Garofalo; W. M. Solomon; M. E. Fenstermacher; T. H. Osborne; J.-K. Park; M. J. Schaffer; P. B. Snyder
• Keywords: Neutral Beam Injection

Results from recent experiments demonstrate that quiescent H-mode (QH-mode) sustained by magnetic torque non-axisymmetric fields is a promising operating mode for future burning plasmas. Using n=3 to replace counter-Ip neutral beam injection (NBI), we have achieved long duration, counter-rotating QH-mode operation with NBI ranging up co-Ip values of 1-1.3 Nm. This 3 4 times the scaled ITER will have. These utilized an ITER-relevant lower single-null plasma shape and were done νped* βNped. discharges exhibited confinement quality H98y2=1.3, in range required ITER. In preliminary using only coil outside toroidal coil, plasmas low q95=3.4 reached fusion gain G=βNH89/q952=0.4, which desired value Shots same configuration also operated net zero torque. The limits on G not yet been established this configuration. work has made significant contact theory. importance edge rotational shear consistent peeling-ballooning Qualitative quantitative agreements predicted neoclassical viscosity seen.