X-ray analysis methods for sources from self-modulated laser wakefield acceleration driven by picosecond lasers
[1];
[2];
[5];
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). NIF. Photon Sciences; Univ. of Texas, Austin, TX (United States). Dept. of Physics
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). NIF. Photon Sciences
- Univ. of Rochester, NY (United States). Lab. for Laser Energetics
- Univ. of California, Los Angeles, CA (United States). Dept. of Electrical Engineering
- Univ. of Texas, Austin, TX (United States). Dept. of Physics; Inst. for Basic Science, Gwangju (Korea, Republic of). Center for Relativistic Laser Science; Gwangju Inst. of Science and Technology (Korea, Republic of). Dept. of Physics and Photon Science
A versatile set of methods for analyzing x-ray energy spectra and photon flux has been developed for laser plasma accelerator experiments driven by picosecond lasers. Forward fit provides extrapolated broad energy spectrum measurements, while Ross pair and differential average transmission analysis provide directly measured data points using a particular diagnostic. Combining these methods allows the measurement of x-ray energy spectra with improved confidence. We apply the methods to three diagnostics (filter wheel, stacked image plate spectrometer, and step wedge), each sensitive to a different region of x-ray energies (<40 keV, 35–100 keV, and 60–1000 keV, respectively), to characterize the analysis methods using laser-driven bremsstrahlung x-rays. We then apply the methods to measure three x-ray mechanisms, betatron, inverse Compton scattering, and bremsstrahlung, driven by a laser plasma accelerator. The analysis results in the measurement of x-ray energy spectra ranging from 10 keV to 1 MeV with peak flux greater than 1010 photons/keV/Sr. The combined analysis methods provide a robust tool to accurately measure broadband x-ray sources (keV to MeV) driven by laser plasma acceleration with picosecond, kilojoule-class lasers.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of Rochester, NY (United States); Univ. of California, Los Angeles, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE Office of Science (SC), High Energy Physics (HEP); USDOE National Nuclear Security Administration (NNSA); LLNL Laboratory Directed Research and Development (LDRD) Program; US Air Force Office of Scientific Research (AFOSR)
- Grant/Contract Number:
- AC52-07NA27344; SC0017950; SC0010064; NA0002950; FA9550-14-1-0045
- OSTI ID:
- 1515341
- Alternate ID(s):
- OSTI ID: 1525868
- Report Number(s):
- LLNL-JRNL-753667; 940202
- Journal Information:
- Review of Scientific Instruments, Vol. 90, Issue 3; ISSN 0034-6748
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
X-ray sources using a picosecond laser driven plasma accelerator
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journal | August 2019 |
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