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Modeling of mixed-phasing antenna-plasma interactions applied to JET A2 antennas

D. A. D’Ippolito

Open publisher page 3 citations

Abstract

The use of mixed (monopole-dipole) phasing of a set of ICRF antennas is potentially useful to optimize tokamak performance and to do interesting physics experiments. However, recent mixed-phasing experiments on JET, described here, showed undesirable antenna-plasma interactions under certain circumstances. We explore a possible physical mechanism: parallel currents flowing between adjacent antennas with different phasings can lead to arcing on the antenna with the largest sheath voltage. Means of controlling the interaction are discussed.

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What this paper is about

The use of mixed (monopole-dipole) phasing of a set of ICRF antennas is potentially useful to optimize tokamak performance and to do interesting physics experiments. However, recent mixed-phasing experiments on JET, described here, showed undesirable antenna-plasma interactions under certain circumstances. We explore a possible physical mechanism: parallel currents flowing between adjacent antennas with different phasings can lead to arcing on the antenna with the largest sheath voltage. Means of controlling the interaction are discussed.

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Available abstract

The use of mixed (monopole-dipole) phasing of a set of ICRF antennas is potentially useful to optimize tokamak performance and to do interesting physics experiments. However, recent mixed-phasing experiments on JET, described here, showed undesirable antenna-plasma interactions under certain circumstances. We explore a possible physical mechanism: parallel currents flowing between adjacent antennas with different phasings can lead to arcing on the antenna with the largest sheath voltage. Means of controlling the interaction are discussed.

Key concepts: Phaser, Antenna (radio), Dipole antenna, Physics, Plasma, Dipole, Jet (fluid), Tokamak

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