Direct laser ion acceleration and above-threshold ionization at intensities from 1021 W/cm2 to 3 × 1023 W/cm2

Yandow, A.; Toncian, T.; Ditmire, T.

doi:10.1103/physreva.100.053406

Title: Direct laser ion acceleration and above-threshold ionization at intensities from 10²¹ W/cm² to 3 × 10²³ W/cm²

Journal Article · Mon Nov 11 00:00:00 EST 2019 · Physical Review A

DOI:https://doi.org/10.1103/physreva.100.053406· OSTI ID:1801056

^[1]; Toncian, T. ^[2]; Ditmire, T. ^[1]

Center for High Energy Density Science, Austin, TX (United States)
Center for High Energy Density Science, Austin, TX (United States); Helmholtz-Zentrum Dresden-Rossendorf, (Germany)

Calculations on the dynamics of ions and electrons in near-infrared laser fields at intensities up to 3 × 10²³ W/cm² are presented here. We explore the acceleration of ions in a laser focus by conservation of canonical momentum during ionization events and by the ponderomotive force in the f/1 focal geometry required to reach such intensity. At intensities exceeding 10²³ W/cm², highly charged ions are expelled from the laser focus before they can interact with the laser pulse at peak intensity, decreasing the predicted ionization yields of deeply bound states. We consider the interaction of a tightly focused, f/1 laser pulse with krypton at an intensity of 3 × 10²³ W /cm² and a pulse duration of 140 fs.We find that the ions and electrons are accelerated to energies in excess of 2 MeV/nucleon and 1.4 GeV, respectively. Ponderomotive expulsion of the parent ions decreases the total number of ultrarelativistic above-threshold ionization electrons produced by tunneling ionization from the K-shell states of krypton but does not change their energy spectrum.

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Research Organization:: Univ. of Texas, Austin, TX (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); US Air Force Office of Scientific Research (AFOSR)

Grant/Contract Number:: NA0002008; FA9550-14-1-0045; FA9550-17-1-0264

OSTI ID:: 1801056

Journal Information:: Physical Review A, Vol. 100, Issue 5; ISSN 2469-9926

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Direct laser ion acceleration and above-threshold ionization at intensities from 10²¹ W/cm² to 3 × 10²³ W/cm²