Primary Subject. January Page 4. Chapter 8: Plasma operation and control, ITER Physics Basis. No significant differences emerge from this analysis. No approximations other than ar-. No link has been identified with the plasma triangularity or elongation. beta (no sample averaging over the expansion point was computed). beta < no-wall limit and benign ELMs. Volume Number 1 beta. Abstract. No trend with density is observed in the small density range covered. PLASMA PHYSICS AND FUSION TECHNOLOGY (S70). Physics. beta