Modelling of mixed-phasing antenna-plasma interactions on JET A2 antennas

D'Ippolito, D. A.; Myra, J. R.; Ryan, P. M.; Righi, E.; Heikkinen, J.; Lamalle, P. U.; Noterdaeme, J. M.

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Modelling of mixed-phasing antenna-plasma interactions on JET A2 antennas

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Noterdaeme, J. M.
Technology (TE), Max Planck Institute for Plasma Physics, Max Planck Society;

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Citation

D'Ippolito, D. A., Myra, J. R., Ryan, P. M., Righi, E., Heikkinen, J., Lamalle, P. U., et al. (2002). Modelling of mixed-phasing antenna-plasma interactions on JET A2 antennas. Nuclear Fusion, 42, 1357-1365.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0027-4195-3

Abstract

The use of mixed(monopole-dipole)-phasing of a set of ion cyclotron range of frequency antennas is potentially useful to optimize tokamak performance. However, recent mixed-phasing experiments on JET, described here, showed undesirable antenna- plasma interactions under certain circumstances. A possible physical mechanism to explain the experimental results is discussed, namely, rf-driven dc 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.