The existing Globus-M machine [1] is a low aspect ratio compact tokamak (R = 0.36 m, a = 0.24 m) with high specific ohmic and auxiliary heating power. First plasma was achieved in Globus-M in 1999. The machine has demonstrated practically all of the project objectives ever since. Target design parameters (aspect ratio-1.5, 2 − X-point configuration, vertical elongation-2.2, traiangularity-0.45, average density-1.0•10 20 m −3 , plasma current-0.3 MA, toroidal beta-12%, auxiliary heating power-1 MW) [2] were achieved and some of them overcame [3,4]. Also Globus-M
The paper is devoted to the thermal energy confinement study at the compact spherical tokamak GlobusM. The regression fit of the database for the Hmode plasma was performed. The energy confinement time (τ E ) dependence on toroidal magnetic field B T is very strong. However the τ E dependence on plasma current I p is weaker than conventional scaling IPB98(y,2) predicts. The B T τ E dependence on ν * is significantly stronger than in ITER scaling, but weaker than those obtained at NSTX and MAST spherical tokamaks.