[Table of Contents]

Plasma and Fusion Research

Volume 5, S2071 (2010)

Regular Articles

Generation of Fast Ions by Microclusters
Alexey AREFIEV1), Boris BREIZMAN1), Vladimir KHUDIK1), Xiaohui GAO2) and Michael DOWNER1,2)
1)
Institute for Fusion Studies, The University of Texas, Austin, TX 78712, USA
2)
Department of Physics, The University of Texas, Austin, TX 78712, USA
(Received 16 December 2009 / Accepted 2 March 2010 / Published 10 December 2010)

Abstract

Laser-irradiated microclusters can generate energetic ions that produce fusion reactions. The amount and spectrum of these ions depend on the cluster-size distribution, electron heating mechanism, and cluster expansion dynamics. This paper describes recent physics results pertinent to the items listed. It is shown that the size distribution of large clusters can be determined from absorption measurements in a pump-probe experiment. It is also shown how a laser can create a two-component electron distribution with a hot minority whose energies exceed the ponderomotive potential. The heating rate and the limitations on electron energy are examined. The hot electron component expands with an equal number of ions. A first-principle model is presented that describes ion acceleration by the hot electron pressure together with adiabatic cooling of the hot electrons.

Keywords

laser-cluster interaction, stochastic electron heating, ion acceleration, cluster-size distribution

DOI: 10.1585/pfr.5.S2071

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This paper may be cited as follows:

Alexey AREFIEV, Boris BREIZMAN, Vladimir KHUDIK, Xiaohui GAO and Michael DOWNER, Plasma Fusion Res. 5, S2071 (2010).