5-9 September 2016
Prague Congress Centre
Europe/Prague timezone

P1.034 Development of an ICRH antenna system at W7-X for plasma heating and wall conditioning

5 Sep 2016, 14:20
1h 40m
Foyer 2A (2nd floor), 3A (3rd floor) (Prague Congress Centre)

Foyer 2A (2nd floor), 3A (3rd floor)

Prague Congress Centre

5. května 65, Prague, Czech Republic
Board: 34
Poster B. Plasma Heating and Current Drive P1 Poster session

Speaker

Bernd Schweer (Laboratory for Plasma Physics LPP)

Description

An ICRH antenna system is developed and will be attached to W7-X for the operational phase 1.2. An antenna box with two straps with surfaces adapted to the 3d LCFS in standard magnetic configuration (m/n=5/5), is located at the low field side in the equatorial plane. The antenna system is optimised for plasma heating and wall conditioning in presence of magnetic field. Each strap is connected via coaxial lines to a generator working in the frequency range from 25 to 38 MHz. The operation of different magnetic configurations at W7-X requires radial shift of the antenna box in the plasma vessel over a distance of 350mm to achieve an optimal coupling of the RF with the plasma. Additionally each strap at one side is connected with a capacitor to optimise the resonant circuit and at the other side with the surrounding grounded antenna box. For safety reasons two air-vacuum feedthroughs in line are placed in each transmission line to minimise the risk of unintentional venting the plasma chamber. For the same reason all supplies for antenna diagnostics are passing an intermediate vacuum between plasma chamber and air. All components in the antenna head are water cooled at up to 10 bars sufficient also for wall conditioning at 150ooC. The temperatures at the antenna box and straps are measured and are leading parameters for the feedback control of the antenna position.  At both toroidal sides of the antenna box gas injection pulses can be initialised in case the RF coupling with the plasma gets lost. This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014-2018 under grant agreement No633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission.

Co-authors

Alena Krivska (Laboratory for Plasma Physics LPP, ERM/KMS, Brussels, Belgium) Andre Messiaen (Laboratory for Plasma Physics LPP, ERM/KMS, Brussels, Belgium) Bernd Schweer (Laboratory for Plasma Physics LPP, ERM/KMS, Brussels, Belgium) Dirk Hartmann (Institut für Plasmaphysik, Max-Planck-Gesellschaft MPG, 17491 Greifswald, Germany) Fabrice Louche (Laboratory for Plasma Physics LPP, ERM/KMS, Brussels, Belgium) Frederic Durodie (Laboratory for Plasma Physics LPP, ERM/KMS, Brussels, Belgium) Guido Offermanns (ZEA-1, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany) Jef Ongena (Laboratory for Plasma Physics LPP, ERM/KMS, Brussels, Belgium) Klaus Peter Hollfeld (ZEA-1, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany) Michael Van Schoor (Laboratory for Plasma Physics LPP, ERM/KMS, Brussels, Belgium) Michel Vervier (Laboratory for Plasma Physics LPP, ERM/KMS, Brussels, Belgium) Olaf Neubauer (IEK-4 Plasmaphysik, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany) Vadim Borsuk (Institut für Plasmaphysik, Max-Planck-Gesellschaft MPG, 17491 Greifswald, Germany) W7-X team (Institut für Plasmaphysik, Max-Planck-Gesellschaft MPG, 17491 Greifswald, Germany)

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