Formation of a highfieldside high density region near the inner divertor of the Globus-M2 tokamak
Ermakov N.V1, Kukushkin K.A.2, Zhiltsov. N. S.1, Tkachenko E.E.1, Kurskiev G.S.1, Mukhin E.E.1, Tolstyakov S.Yu.1, Shchegolev P.B.1, Telnova A.Yu. 1, Minaev V.B.1, Tokarev V.A.1, Solovey V.A. 1, Khromov N.A.1, Kaveeva E.G.2, Kavin A.A.3, Kiselev E.O. 1, Koval A.N.1, Nikolaenko K.O.1, Novokhatskii A.N1, Petrov Yu.V.1, Rozhansky V.A.2, Sakharov N.V. 1, Senichenkov I.Yu. 2
1Ioffe Institute, St. Petersburg, Russia
2Peter the Great Saint-Petersburg Polytechnic University, St. Petersburg, Russia
3JSC «NIIEFA», St. Petersburg, Russia
Email: ermafin@gmail.com
The paper presents the results of studying the divertor plasma of the Globus-M2 tokamak (major radius R=0.36 m, minor radius a=0.24 m) with an open divertor by using Thomson scattering diagnostics in the vicinity of X-point and in the equatorial plane, as well as by using Langmuir probes in the outer divertor. The divertor plate temperatures and strike point positions were fixed with an IR camera. The phenomenon known as formation of a high field side high density (HFSHD) region in the inner divertor was for the first time detected in a spherical tokamak and was confirmed in simulating the Globus-M2 tokamak discharges with code SOLPS-ITER. HFSHD gets formed between the inner (X-point below) and outer (X-point above) separatrices. Keywords: tokamak, plasma, Thomson scattering, divertor, Globus-M2, SOLPS-ITER, HFSHD.
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