Preliminary Study of Ideal Operational MHD Beta Limit in HL-2A Tokamak Plasmas

Abstract

Magnetohydrodynamic (MHD) n=1 kink mode with n the toroidal mode number is studied and the operational beta limit, constrained by the mode, is calculated for the equilibrium of HL-2A by using the GATO code. Approximately the same beta limit is obtained for configurations with a value of the axial safety factor q0 both larger and less than 1. Without the stabilization of the conducting wall, the beta limit is found to be 0.821% corresponding to a normalized beta value of β c N =2.56 for a typical HL-2A discharge with a plasma current Ip=0.245 MA, and the scaling of β c N ∼constant is confirmed.

Application of poloidal beta and plasma internal inductance in determination of input power time of Damavand tokamak

“…Therefore, input power time (energy confinement time) is one of the most important parameters of the plasma ignition in tokamaks [1][2][3]. In general, input power time should be analyzed by microscopic and transport behavior of the plasma.…”

Time evolution of the energy confinement time, internal inductance and effective edge safety factor on IR-T1 tokamak

“…To achieve the thermonuclear condition (the ignition condition) in a tokamak (nT τ E > 3 × 10 21 m −3 keV s), it is necessary to confine the plasma for a sufficient length of time. The global energy confinement time τ E is defined by 3/2n(T e +T i )d 3 x/P, where n is the plasma density, T is the plasma particle temperature and P is the total input power [6][7][8][9]. In the absence of a theoretical understanding of confinement and given the need to predict the confinement properties of future tokamaks, it is considered necessary to resort to empirical methods.…”