Formation of a high field side high density region near the inner divertor of the Globus-M2 tokamak

The results of the study of the divertor plasma of the Globus-M2 tokamak (major radius $R$ = 0.36 m, minor radius $a$ = 0.24 m) with an open divertor are presented using Thomson scattering diagnostics in the X-point region and in the equatorial plane, as well as Langmuir probes in the outer divertor. The temperature of the divertor plates and the position strikes points were measured using an IR camera. The phenomenon known as the formation of a high field side high density(HFSHD) region in the inner divertor was first recorded in a spherical tokamak and was confirmed in the simulation of the Globus-M2 tokamak discharges using the SOLPS-ITER code. The HFSHD is formed between the inner (X-point below) and outer (X-point above) separatrices.