ITALY - SAPIENZA

'LA SAPIENZA' UNIVERSITY OF ROME

Department of Electronic Engineering

Via Eudossiana 18, 00184 Roma

Telephone: +39 06 4458 5841
Telefax: +39 06 4742 647
E-mail: frezza@die.ing.uniroma1.it

Frezza, Fabrizio
Gerosa, Giorgio

Lampariello, Paolo

Pajewski, Lara

Department of Energetics

Via A. Scarpa, 14 - 00161 Roma

Telephone: +39 06 4976 6800
Telefax: +39 06 4424 0183
Atzeni, Stefano (Phone: + 39 06 4976 6532; atzeni@uniroma1.it )

Research activities:
Theoretical and computational studies (by multidimensional radiation-hydro-nuclear codes) of basic physics issues of interest for inertial confinement fusion. Topics of current interest include the physics of central ignition and of fast ignition, fast ignition by laser accelerated proton beams, burn of DT and T-lean fuels, linear and non-linear stages of the Rayleigh-Taylor instability at both the ablation surface and the inner layer of an imploded shell, laser driven shock waves.

These activities are performed in collaboration with Italian and international institutions, including the Universities of Pisa and Milan, the Max-Planck-Institut für Quantenoptik (Garching), the Polytechnical University of Madrid, the Gesellschaft für Schwerionenforschung (Darmstadt).

'ROMA TRE' UNIVERSITY OF ROME

Department of Electronic Engineering

Via della Vasca Navale 84, 00146 Roma

Telephone: +39 06 5517 7055
Telefax: +39 06 5579 078
E-mail: g.schettini@uniroma3.it

Borghi, Riccardo

Schettini, Giuseppe

Department of Physics

Via della Vasca Navale 84, 00146 Roma

Telephone: +39 06 5517 7207
Telefax: +39 06 5579 303
E-mail: santarsiero@uniroma1.it

Gori, Franco

Santarsiero, Massimo

Research activities:
Radiofrequency heating and current drive.

Plasma-wave interaction.

Quasi-optical gratings for heating and current drive in thermonuclear plasmas.

The need of simpler structures alternative to waveguide phased arrays for the launch of lower-hybrid waves in tokamaks has become topical in the last years because of the extreme complexity of the traditional launchers scheduled for the reactor machines of the next generation. Antennas which launch these slow waves have dimensions larger than the operative wavelength; this fact has led us to think of quasi optical methods. We study plasma heating by means of the coupling to slow waves, generated by a grating of cylinders with suitable section and disposition, placed in the proximity of the plasma surface on which a microwave field hits. First, plane waves have been considered as sources. The problem of Gaussian beam excitation has been studied starting from the plane-wave case. In particular, when the incident beam is paraxial with the transverse dimension much larger than the cylinder section, it is possible to solve the problem expanding the incident field in terms of Bessel functions.