Effects of front surface plasma expansion on proton acceleration in ultraintense laser irradiation of foil targets

The properties of beams of high energy protons accelerated during ultraintense, picosecond laser-irradiation of thin foil targets are investigated as a function of preplasma expansion at the target front surface. Significant enhancement in the maximum proton energy and laser-to-proton energy conversion efficiency is observed at optimum preplasma density gradients due, to self-focusing Of the incident laser pulse. For very long preplasma expansion, the propagating laser pulse is observed to filament, resulting in highly uniform proton beams, but with reduced flux and maximum energy.

Carroll, D. C. (author)
Lundh, OlleLund University,Lunds universitet,Atomfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Atomic Physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)fysi-olu (author)
Nuernberg, F. (author)
Markey, K. (author)
Bandyopadhyay, S. (author)
Batani, D. (author)
Evans, R. G. (author)
Jafer, R. (author)
Kar, S. (author)
Neely, D. (author)
Pepler, D. (author)
Quinn, M. N. (author)
Redaelli, R. (author)
Roth, M. (author)
Wahlstrom, C. -G. (author)
Yuan, X. H. (author)
Zepf, M. (author)
AtomfysikFysiska institutionen (creator_code:org_t)

By the author/editor: McKenna, P.; Carroll, D. C.; Lundh, Olle; Nuernberg, F.; Markey, K.; Bandyopadhyay, S ...; show more...; Batani, D.; Evans, R. G.; Jafer, R.; Kar, S.; Neely, D.; Pepler, D.; Quinn, M. N.; Redaelli, R.; Roth, M.; Wahlstrom, C. -G ...; Yuan, X. H.; Zepf, M.; show less...

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NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Atom and Molecul ...

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