(EX/6-1) Fast Particle Physics on ASDEX Upgrade

S. Günter1), G. Conway1), H.U. Fahrbach1), C.B. Forest2), S. DaGraca3), M. Garcia Munoz1), T. Hauff1), J. Hobirk1), V. Igochine1), F. Jenko1), K. Lackner1), P. Lauber1), P.J. McCarthy4), M. Maraschek1), P. Martin5), E. Poli1), K. Sassenberg4), E. Strumberger1), G. Tardini1), H. Zohm1), ASDEX Upgrade Team1)
1) Max-Planck-Institut für Plasmaphysik, Garching, Germany
2) Dept. of Physics, University of Wisconsin, Madison, Wisconsin
3)Centro de Fusao Nuclear, Instituto Superior Tecnico, Lisboa, Spain
4) Physics department, University College Cork, Cork, Ireland
5) Consorzio RFX, Padova, Italy

Abstract.  ASDEX Upgrade has broad capabilities to produce and to diagnose fast particles. The flexible heating system (up to 20 MW NBI at 60/100 keV; up to 6 MW ICRH, up to 2 MW ECRH) allows to partially decouple the effects of bulk plasma heating from the fast ion population. A fast-ion detector, mounted on a movable manipulator at the low-field side mid-plane, gives energy and pitch-angle resolved distributions of the lost particles with a time resolution approaching their toroidal transit time (1 MHz). Extensions to our ICRH system allow us now to operate it stably at two close-by frequencies. They can be swept during a discharge, making the system ideally suited for beat wave excitation of Alfvén-type waves. On the modelling side we have developed a non-perturbative, fully gyrokinetic, linear stability code using exact particle orbits (LIGKA), and have extended a gyrokinetic turbulence code (GENE) to include fast ions as a third particle species.

Full paper and slides available (PDF)