Correlation of spectral, spatial, and angular characteristics of an ultrashort laser driven proton source

Ter-Avetisyan, S.; Schnürer, M.; Nickles, P. V.; Sandner, W.; Nakamura, T.; Mima, K.
April 2009
Physics of Plasmas;Apr2009, Vol. 16 Issue 4, p043108
Academic Journal
The laser driven ion source is a highly organized dynamical system. It relies on a well defined interrelation between the spatial and momentum distributions of emitted ions. This correlation is found by a consecutive spectral characterization of distinct proton beamlets emitted from different spatial target positions and under different angles. In case of a flat target and a perfectly round laser focal spot, the proton source is circular symmetric and each source point behaves similarly: the higher the proton energy the smaller the source size and the larger the emission angle for a similar source extension. Only the symmetry axis is unique; here all protons are emitted at 0° to the target normal.


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