The influence of surface impurities on photoelectric currents driven by intense soft x rays

Roberds, Nicholas A.

doi:10.1063/5.0059958

The influence of surface impurities on photoelectric currents driven by intense soft x rays

Journal Article · Mon Feb 28 23:00:00 EST 2022 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0059958· OSTI ID:1882886

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Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

In an x-ray driven cavity experiment, an intense flux of soft x rays on the emitting surface produces significant emission of photoelectrons having several kiloelectronvolts of kinetic energy. At the same time, rapid heating of the emitting surface occurs, resulting in the release of adsorbed surface impurities and subsequent formation of an impurity plasma. This numerical study explores a simple model for the photoelectric currents and the impurity plasma. In this work, attention is given to the effect of varying the composition of the impurity plasma. The presence of protons or hydrogen molecular ions leads to a substantially enhanced cavity current, while heavier plasma ions are seen to have a limited effect on the cavity current due to their lower mobility. Additionally, it is demonstrated that an additional peak in the current waveform can appear due to the impurity plasma. A correlation between the impurity plasma composition and the timing of this peak is elucidated.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

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

Grant/Contract Number:: NA0003525

OSTI ID:: 1882886

Alternate ID(s):: OSTI ID: 1846847

Report Number(s):: SAND2022-1489J; 703358

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 3 Vol. 29; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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The influence of surface impurities on photoelectric currents driven by intense soft x rays

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