Laurent Colas - IRFM

Laurent Colas
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Laurent Colas
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IRFM
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Physics - Plasma Physics (2)
 
Physics - Instrumentation and Detectors (1)

Publications Authored By Laurent Colas

We investigate theoretically how sheath radio-frequency (RF) oscillations relate to the spatial structure of the near RF parallel electric field E// emitted by Ion Cyclotron (IC) wave launchers. We use a simple model of Slow Wave (SW) evanescence coupled with Direct Current (DC) plasma biasing via sheath boundary conditions in a 3D parallelepiped filled with homogeneous cold magnetized plasma. Within a "wide sheaths" asymptotic regime, valid for large-amplitude near RF fields, the RF part of this simple RF+DC model becomes linear: the sheath oscillating voltage VRF at open field line boundaries can be re-expressed as a linear combination of individual contributions by every emitting point in the input field map. Read More

2016Mar
Affiliations: 1IRFM, 2IRFM, 3ASIPP, 4IRFM, 5ASIPP, 6IRFM, 7IRFM, 8IRFM, 9ASIPP, 10IRFM, ASIPP, 11IRFM, 12IRFM, 13LPP ERM KMS, 14LPP ERM KMS, 15IRFM, 16IRFM, 17IRFM, 18IRFM, 19IRFM, 20IRFM, 21IPP, 22IRFM, 23IRFM, 24IRFM, 25IRFM, 26IRFM, 27IRFM, 28IRFM, 29IRFM, 30IRFM, 31IRFM, 32LE, 33ASIPP, 34IPP, 35ASIPP, 36ASIPP

The 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. Read More