Ryazantsev, Sergey N., Martynenko, Artem S., Sedov, Maksim V. et al. (15 more authors) (2022) Absolute keV x-ray yield and conversion efficiency in over dense Si sub-petawatt laser plasma. Plasma Physics and Controlled Fusion. 105016. ISSN 1361-6587
Abstract
Laser-produced plasmas are bright, short sources of x-rays commonly used for time-resolved imaging and spectroscopy. Their usage implies accurate knowledge of laser-to-x-ray conversion efficiency (CE), spectrum, photon yield and angular distribution. Here, we report on soft x-ray emission in the direction close to the target normal from a thin Si foil irradiated by a sub-PW picosecond laser pulse. These absolute measurements cover a continuous and broad spectral range that extends from 4.75 to 7.3 Å (1.7-2.6 keV). The x-ray spectrum consists of spectral line transitions from highly charged ions and broadband emission with contributions from recombination and free-free processes that occur when electrons decelerate in plasma electromagnetic fields. Angular distribution of the emission was investigated via particle-in-cell simulations, which allowed to estimate the yield into the full solid angle. We find that experimental and simulation estimations of laser to free-free emission CE are in good agreement.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details |
Keywords: | absolute emissivity of laser plasma,crystal x-ray spectrometer,laser to x-rays conversion efficiency,PW laser plasma |
Dates: |
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Institution: | The University of York |
Academic Units: | The University of York > Faculty of Sciences (York) > Physics (York) |
Depositing User: | Pure (York) |
Date Deposited: | 06 Oct 2022 13:40 |
Last Modified: | 06 Dec 2024 00:22 |
Published Version: | https://doi.org/10.1088/1361-6587/ac8b33 |
Status: | Published |
Refereed: | Yes |
Identification Number: | 10.1088/1361-6587/ac8b33 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:191777 |
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