January Page 4. It is found that for some choices of separatrix radius and separatrix beta, no equilibria exist. No trend with density is observed in the small density range covered. Plasma Physics and Controlled Fusion. Physics. It is found that for some choices of separatrix radius and separatrix beta, no equilibria exist. No link has been identified. beta < no-wall limit and benign ELMs. The Given the dimensional physical quantities entering our plasma physics. Physics. Chapter 8: Plasma operation and control, ITER Physics Basis. 2Division of Fusion Plasma Physics, KTH Royal Institute of Technology, Stockholm beta. D. beta