K. Tőkési 1 Institute for Nuclear Research, Hungarian Academy of Sciences (ATOMKI), Debrecen, Hungary, EU ATOMIC DATA FOR INTEGRATED TOKAMAC MODELLING + v nxvnxv

Collaborators D. Tskhakaya D. Coster Max-Planck- Institut für Plasmaphysik, Garching, German, EU Institute for Theoretical Physics University of Innsbruck, Innsbruck, Austria, EU

Outlook ITER - fusion energy Why? Methods of the analysis C lassical treatment of the collision problem - Trajectory Monte Carlo method Search for Fermi-shuttle ionization Search for Fermi-shuttle ionization Hot electron generation - Examples - C + + Ne - Al q+ + He - N + + Ar - Universal functionl form? Summary

ITER

Wide range of atomic data are needed by the ITM-TF (transport, ionization, capture)

Generate energetic electrons

Ping-pong game: heavy paddle – light ball Elastic scattering: m M V Before: M V’V’ m v After: Momentum conservation: Energy conservation: The final velocity of the light particle in the laboratory frame Large energy gain

Energy gain in ping-pong game Projectile velocity (V) E V =0.5 m e V 2 kicks: ball velocity:2V4V6V8V10V ball energy: 4 E V 16 E V 36 E V 64 E V 100 E V

Charge particles in moving magnetic fields B1B1 B2B2

Pioneer: E. Fermi, Phys Rev. 75 (1949) Pierre Auger project - Argentina 1600 detectors in 3000 km 2 Can it be observed in an atomic scale ?

Ionization in ion-atom collisions Description: Z P /Z T v P /v e MO PWBA CDW adiabaticfast Distorted wawe approximations Perturbative methods Molecular development Coupled channels calculations ? Non-perturbative models: Classical treatment Exact quantum models, e.g., one dimensional „scattering” on a delta potential Surprise (Wang et al.,1991): 2V 4V 6V

Classical nonperturbative method – „theoretical experiment” Treats the many-body interactions – multiple scattering model 3-body CTMC approach Model potential: Target nucleus electron Projectile V(r TP ) V(r Te ) V(r Pe ) v Specific for the present work: -Screened core potentials for both partners (analytic GSZ model pot.) -Strategies for extracting the relevant information a three-body balance is bound by E and p conservation; final-state kinematics does not provide information about the mechanism

Example - advertisement Doubly differential cross sections for ionization of neon by 2.4 MeV C + ions. θ= 130°

C + + Ne 0.8 MeV C MeV C MeV C + Target ionization Projectile ionization Target and projectile ionization

Observation of the Fermi-shuttle process in the angular integrated electron spectra. Separation of multiple scattering components. 2V3V 2V

Doubly differential cross sections for ionization of helium by 100 and 200 keV Al 3+ ions.

Doubly differential cross sections for ionization of helium by 100 keV Al + ions.

Slow ion impact (>98% ping-pong) Experiment HMI Berlin CTMC Debrecen

Long ping-pong game (15 keV N + + Ar) P-T-P-T-P-T-P-T-P-T

Hopefully this talk has given An indication of the needs of the fusion community for Atomic data. Some sense of new developments needs. -Classical treatments of the atomic collisions reproduce the electron emission spectra. - The signature of the Fermi shuttle type ionization is identified in the electron spectra. -Fermi-shuttle multiple scattering is significant or dominant for slow collisions. Generate energetic electrons Electron emission in low energy ion-matter interactions might be governed by multiple scattering. Conclusions

Thank you!