Optical signature of RF arcs in the ICRH frequency range

Dumortier, P.; Huijser, T.; D’Incà, R.; Faugel, H.; Hangan, D.; Huygen, S.; Messiaen, A.; Onyshchenko, Andrii; Siegl, G.; Valk, N. C. J. van der; Vervier, M.

doi:10.1016/j.fusengdes.2011.02.080

Cited by 3 publications

(1 citation statement)

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“…A new optical arc detection system comes in reinforcement to the voltage ratios (V r /V f ) and Sub-Harmonic Arc Detection (SHAD) systems. This system relies on 6 optical fibres per antenna associated to fast photodetectors (<10 µs), looking into the low impedance regions around the T-junction where the V r /V f monitor is known to be not reliable [4,12,13].…”

Section: Auxiliary Systems and Diagnosticsmentioning

confidence: 99%

Ion cyclotron resonance heating systems upgrade toward high power and CW operations in WEST

Hillairet¹,

Mollard²,

Zhao³

et al. 2015

AIP Conference Proceedings

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International audienceThe design of the WEST (Tungsten-W Environment in Steady-state Tokamak) Ion cyclotron resonance heating antennas is based on a previously tested conjugate-T Resonant Double Loops prototype equipped with internal vacuum matching capacitors. The design and construction of three new WEST ICRH antennas are being carried out in close collaboration with ASIPP, within the framework of the Associated Laboratory in the fusion field between IRFM and ASIPP. The coupling performance to the plasma and the load-tolerance have been improved, while adding Continuous Wave operation capability by introducing water cooling in the entire antenna. On the generator side, the operation class of the high power tetrodes is changed from AB to B in order to allow high power operation (up to 3 MW per antenna) under higher VSWR (up to 2:1). Reliability of the generators is also improved by increasing the cavity breakdown voltage. The control and data acquisition system is also upgraded in order to resolve and react on fast events, such as ELMs. A new optical arc detection system comes in reinforcement of the V r /V f and SHAD systems

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Section: Auxiliary Systems and Diagnosticsmentioning

confidence: 99%