Plasma Stored Energy Analysis during Neutral Beam Injection in the Globus-M2 Tokamak Using the PET Equilibrium Code and Diamagnetic Measurements.

The thermal energy stored in plasma , normalized internal plasma inductance and current beta are calculated via the free-boundary equilibrium PET code. The equilibrium reconstruction algorithm is iterative method of minimizing two parameters, the distance between the reconstructed plasma boundary and that simulated by the PET code, as well as the difference between the plasma diamagnetic flux from PET and the experimental one. The discharges from the Globus-M2 tokamak with a toroidal magnetic field up to 0.9 T and a plasma current of 0.3–0.4 MA in a mode with auxiliary heating by two atomic injectors are analyzed. The possibility of using approximate formulas for estimating and is considered. The measured diamagnetic flux is used to determine and then to calculate . The normalized internal plasma inductance is additionally determined from the measured vertical magnetic field under the assumption that . [ABSTRACT FROM AUTHOR]