Quasi-monoenergetic proton acceleration from cryogenic hydrogen microjet by ultrashort ultraintense laser pulses

Sharma, A. and Tibai, Z. and Hebling, J. and Fülöp, J. A. (2018) Quasi-monoenergetic proton acceleration from cryogenic hydrogen microjet by ultrashort ultraintense laser pulses. Physics of Plasmas, 25 (3). pp. 1-10. ISSN 1070-664X

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Abstract

Laser-driven proton acceleration from a micron-sized cryogenic hydrogen microjet target is investigated using multi-dimensional particle-in-cell simulations. With few-cycle (20-fs) ultraintense (2-PW) laser pulses, high-energy quasi-monoenergetic proton acceleration is predicted in a new regime. A collisionless shock-wave acceleration mechanism influenced by Weibel instability results in a maximum proton energy as high as 160MeV and a quasi-monoenergetic peak at 80MeV for 1022 W/cm2 laser intensity with controlled prepulses. A self-generated strong quasistatic magnetic field is also observed in the plasma, which modifies the spatial distribution of the proton beam.

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