Above-threshold ionization at laser intensity greater than 1020 W/cm2

Yandow, A.; Ha, T. N.; Aniculaesei, C.; Smith, H. L.; Richmond, C. G.; Spinks, M. M.; Quevedo, H. J.; Bruce, S.; Darilek, M.; Chang, C.; Garcia, D. A.; Gaul, E.; Donovan, M. E.; Hegelich, B. M.; Ditmire, T.

doi:10.1103/physreva.109.023119

Title: Above-threshold ionization at laser intensity greater than 10 20 W / cm 2

Journal Article · 26 February 2024 · Physical Review A

DOI: https://doi.org/10.1103/physreva.109.023119 · OSTI ID:2301856

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University of Texas, Austin, TX (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
University of Texas, Austin, TX (United States)

Here we present experimental observation of above-threshold ionization (ATI) electrons produced by ionization of the neon K shell in a laser field where intensity exceeds 10²⁰W/cm². An array of plastic scintillating calorimeter detectors was used to measure the high-energy electrons at four angles in the laser forward direction. Coarse energy resolution was obtained using aluminum filters of several thicknesses to block lower-energy electrons. A threshold intensity around 2×10²⁰W/cm² is observed for production of energetic ATI electrons in the laser forward direction, with maximum electron energy exceeding 10 MeV. L-shell electrons with energies <1.4 MeV are scattered farther forward along the laser direction than expected. We present comparisons of the measured total electron energies to the predictions of Monte Carlo models employing the ADK-PPT ionization model and the Augst barrier suppression ionization model.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 2301856

Report Number(s):: LLNL--JRNL-849251; LLNL--JRNL-860373; 1072484

Journal Information:: Physical Review A, Journal Name: Physical Review A Journal Issue: 2 Vol. 109; ISSN 2469-9926

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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