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Plasma operation and electric field measurements in IShTAR

Abstract : The overall goal of the IShTAR (Ion cyclotron Sheath Test ARrangement) project is to study antenna near-fields in the presence of a plasma and magnetic field to assess theoretical predictions on radio frequency (RF) sheaths and to guide theoretical modelling [1, 2, 3]. For Ion Cyclotron Radio Frequency (ICRF) antenna applications it is favourable to operate at tokamak edge-like conditions for density and temperature. A helicon antenna at a frequency of 11.76 MHz and with power up to 3kW, is used to create argon or helium plasmas in IShTAR. IShTAR plasmas operations Figure 1: Radial plasma density profiles for various currents in the coils surrounding the main chamber (I big) and plasma source (I source). The radial position of the ICRF antenna is specified by a vertical green line. Technicalities and capabilities of the IShTAR device have been described in [1, 3]. Plasmas have now been characterised in a systematic way in order to obtain reproducible density profiles. An extensive exploration of the discharge parameters (such as the neutral gas pressure, the gas type, the helicon antenna power and the magnetic field topology) has been performed [4]. A selection of resulting radial density profiles is presented in figure 1. They have been obtained by
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Submitted on : Friday, October 9, 2020 - 4:04:43 PM
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K Crombé, A Kostic, A Nikiforov, I Shesterikov, M Usoltceva, et al.. Plasma operation and electric field measurements in IShTAR. 46th EPS Conference on Plasma Physics, Milano Italy, 8-12th July 2019 P1.1014, Jul 2019, Milano, Italy. ⟨hal-02962983⟩

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