Discharge initiation by ICRF antenna in IShTAR
1 Laboratory for Plasma Physics, ERM/KMS, 1000 Brussels, Belgium
2 Ghent University, Department of Applied Physics, 9000 Ghent, Belgium
3 Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany
4 Université de Lorraine, 54506 Vandœuvre-lés-Nancy, France
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Published online: 23 October 2017
IShTAR is a linear magnetized plasma test facility dedicated to the investigation of RF wave/plasma interaction. The IShTAR ICRF system consists of a single strap RF antenna. When using the antenna for plasma production without an external plasma source, it is shown that the plasma is either produced in front of the antenna strap or inside the antenna box depending on the antenna parameters. Here, we present experimental and numerical investigation of the plasma initiation parametric dependencies. Detailed pressure and RF power scans were performed in helium at f = 5.22 MHz and f = 42.06 MHz. The experiment shows the parameter ranges for which the plasma is produced in front of the strap, or inside the antenna box. These ranges are validated by simulations with the RFdinity model, and by theoretical predictions.
© The authors, published by EDP Sciences, 2017
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