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We report on the development of a highly directional, narrow energy band,short time duration proton beam operating at high repetition rate, suitable formeasurements of stopping power in high energy density plasmas as well as otherapplications. The protons are generated with an ultrashort-pulse laserinteracting with a solid target and converted to a pencil-like narrow-band beamusing a compact magnet-based energy selector. We experimentally demonstrate theproduction of a proton beam with an energy of 500 keV and energy spread wellbelow 10%, and a pulse duration of 260 ps. The energy loss of this beam ismeasured in a 2 ${\mu}$m thick solid Mylar target and found to be in within 1%of theoretical predictions. The short time duration of the proton pulse makesit particularly well suited for applications involving the probing of highlytransient plasma states produced in laser-matter interaction experiments, inparticular measurements of proton stopping power.

A quasi-monoenergetic short time duration compact proton source for probing high energy density states of matter