High repetition rate, multi-MeV proton source from cryogenic hydrogen jets

作者：Gauthier M^*; Curry C B; Goede S; Brack F E; Kim J B; MacDonald M J; Metzkes J; Obst L; Rehwald M; Roedel C; Schlenvoigt H P; Schumaker W; Schramm U; Zeil K; Glenzer S H

来源：Applied Physics Letters, 2017, 111(11): 114102.

DOI：10.1063/1.4990487

We report on a high repetition rate proton source produced by high-intensity laser irradiation of a continuously flowing, cryogenic hydrogen jet. The proton energy spectra are recorded at 1Hz for Draco laser powers of 6, 20, 40, and 100 TW. The source delivers similar to 10(13) protons/MeV/sr/min. We find that the average proton number over one minute, at energies sufficiently far from the cut-off energy, is robust to laser-target overlap and nearly constant. This work is therefore a first step towards pulsed laser-driven proton sources for time-resolved radiation damage studies and applications which require quasi-continuous doses at MeV energies.

• 出版日期2017-9-11