Engineering aspects of modernisation of heavy ion beam probe diagnostics on the T-10 tokamak

Abstract

The upgraded Heavy Ion Beam Probe (HIBP) diagnostic system for the T-10 tokamak operating at the National Research Center «Kurchatov Institute» is presented. The upgrade is focused on the increase in the primary beam current density, which is required for the extension of the frequency range of the HIBP signals (potential and electron density oscillations) to 500 kHz, increasing the electron density operating limit to 5·1019 m-3 and the rise in the signal intensity to the noise ratio during the studies of the geodesic acoustic modes at the high plasma density. This becomes possible due to a newly designed emitter-extractor unit of the HIBP accelerator aiming at providing the primary beam with the current of 300 μA at the energy of the 300 keV and diameter of 7-10 mm. The new in-vessel components of the primary beamline (wire sensors and Faraday cup) were upgraded accordingly to be able to provide the probing beam with the advanced parameters to the plasma.