Speaker
Dr
Jozef ONGENA
(Plasma Physics Lab, ERM-KMS, Brussels)
Description
An important aim of W7-X is to demonstrate fast ion confinement at volume averaged beta values up to 5% for which W7-X was optimised [1]. These high beta values correspond to plasma densities above 10^{20}m^{-3}. Mimicking the behaviour of alpha particles in a future stellarator requires the presence of energetic ions with energies in the range ~100 keV in the core of W7-X high density plasmas [2]. This is a challenging task, but such a population can be created using Ion Cyclotron Resonance Heating (ICRH) using various heating schemes, including the newly demonstrated 3-ion heating scenario [3,4].
The ICRH system under construction for W7-X aims in its final configuration at delivering RF power levels up to ~1.5MW in the frequency range 25-38MHz with pulse lengths up to 10s [5]. The antenna consists of two straps and is foreseen with a pre-matching system to limit voltages in the feeding transmission lines and matching system. The shape of the antenna is carefully matched to the 3D shape of the Last Closed Magnetic Surface (LCMS) of the standard magnetic field configuration on W7-X [6].
At the standard magnetic field of 2.5T, fast (~ 100-200 keV) H, D, 3He and 4He particles can be generated in high density (n_{e} > 10^{20}m^{-3}) W7-X plasmas for studies of fast ion confinement in the optimized stellarator magnetic topology of W7-X using various heating scenarios: minority heating of H, 2nd harmonic heating of D or ^{4}He, and using the 3 ion scenario to generate fast ^{3}He in H-D or H-^{4}He mixture plasmas.
A purposely-built test stand in the Institute for Energy and Climate Research/ Plasma Physics (IEK-4, Forschungszentrum Jülich, Germany) is being assembled to check the main properties of the ICRH antenna before installation in W7-X. Checks of the vacuum compatibility, voltage standoff and functionality of the radial positioning system are underway. We will provide a detailed description of the test stand, obtained results and conclusions for the use of the ICRH system at W7-X, and in as far as possible also first results obtained on W7-X.
| Country or International Organization | Belgium |
|---|---|
| Paper Number | EX/P8-27 |
Primary author
Dr
Jozef ONGENA
(Plasma Physics Lab, ERM-KMS, Brussels)
Co-authors
Ms
Alena Krivska
(Plasma Physics Lab, ERM-KMS, Brussels, Belgium)
Dr
Anatoli Lyssoivan
(Plasma Physics Lab, ERM-KMS, Brussels, Belgium)
Dr
Andreas Dinklage
(Max-Planck-Institut für Plasmaphysik)
Dr
Andreas Krämer-Flecken
(Forschungszentrum Jülich)
Dr
André Messiaen
(Plasma Physics Lab, ERM-KMS, Brussels, Belgium)
Mrs
Anja Mauel
(ZEA-1, Forschungszentrum Jülich, Germany)
Dr
Bernd Schweer
(Plasma Physics Lab, ERM-KMS, Brussels, Belgium)
Mr
David Castaño-Bardawil
(IEK-4, Forschungszentrum Jülich)
Mr
Dirk Hartmann
(Max-Planck Institute für Plasmaphysik, Greifswald, Germany)
Dr
Dirk Nicolai
(IEK-4, Forschungszentrum Jülich, Germany)
Dr
Fabrice Louche
(Plasma Physics Lab, ERM-KMS, Brussels, Belgium)
Mr
Frederic Durodie
(Belgian Fusion Association)
Mr
Gilles Jouniaux
(Plasma Physics Lab, ERM-KMS, Brussels, Belgium)
Dr
Guido Offermanns
(ZEA-1, Forschungszentrum Jülich, Germany)
Mr
Guruparan Satheeswaran
(IEK-4, Forschungszentrum Jülich, Germany)
Dr
Heinrich Laqua
(Max-Planck-Institute for Plasma Physics, Greifswald, Germany)
Dr
Ivan Stepanov
(Plasma Physics Lab, ERM-KMS, Brussels, Belgium)
Dr
Jonathan Faustin
(Max-Planck Institute für Plasmaphysik, Greifswald)
Mr
Klaus-Peter Hollfeld
(ZEA-1, Forschungszentrum Jülich, Germany)
Dr
Kristel Crombe
(Ghent University, Belgium)
Prof.
Michael Van Schoor
(Plasma Physics Lab, ERM-KMS, Brussels, Belgium)
Mr
Michel Berte
(Plasma Physics Lab, ERM-KMS, Brussels)
Mr
Michel Vervier
(Plasma Physics Lab, ERM-KMS, Brussels, Belgium)
Dr
Olaf Neubauer
(IEK-4, Forschungszentrum Jülich, Germany)
Dr
Pascal Despontin
(Plasma Physics Lab, ERM-KMS, Brussels)
Dr
Peter Kallmeyer
(Max-Planck Institute für Plasmaphysik, Greifswald, Germany)
Dr
Rainer Schick
(IEK-4, Forschungszentrum Jülich, Germany)
Mr
Rene Philips
(Plasma Physics Lab, ERM-KMS, Brussels, Belgium)
Prof.
Robert Wolf
(Max-Planck-Institute for Plasma Physics)
Dr
Sergey Bozhenkov
(Max-Planck Insitute of Plasma Physics)
Dr
Tom Wauters
(Laboratory for Plasma Physics - ERM/KMS, 1000 Brussels, Belgium, TEC Partner)
Mr
Vadim Borsuk
(IEK-4, Forschungszentrum Jülich)
Dr
Yevgen Kazakov
(Laboratory for Plasma Physics, LPP-ERM/KMS)
