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Ponomarenko, Anna; Yashin, Alexander; Kurskiev, Gleb; Minaev, Vladimir; Petrov, Alexander; Petrov, Yuri; Sakharov, Nikolay; Zhiltsov, Nikita
Sensors (Basel, Switzerland), 01/2023, Letnik: 23, Številka: 2Journal Article
This paper presents the first results of a study of the LH transition on the new spherical Globus-M2 tokamak using the Doppler backscattering (DBS) diagnostic. New data characterizing the H-mode of discharges with higher values of the plasma parameters, such as magnetic field B up to 0.9 T and plasma current I up to 450 kA, were collected and analyzed. An upgraded neutral beam injection (NBI) system was used to initiate the LH transition. DBS allows the measurement of the poloidal rotation velocity and the turbulence amplitude of the plasma. The multi-frequency DBS system installed on Globus-M2 can simultaneously collect data in different areas spanning from the separatrix to the plasma core. This allowed for the radial profiles of the rotation velocity and electric field to be calculated before and after the LH transition. In addition, the values and temporal evolution of the velocity shear were obtained. The associated turbulence suppression after the transition to the H-mode was investigated using DBS.
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