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Robust unfolding of MeV x-ray spectra from filter stack spectrometer data.
Wong, C-S; Strehlow, J; Broughton, D P; Luedtke, S V; Huang, C-K; Bogale, A; Fitzgarrald, R; Nedbailo, R; Schmidt, J L; Schmidt, T R; Twardowski, J; Van Pelt, A; Alvarez, M Alvarado; Junghans, A; Mix, L T; Reinovsky, R E; Rusby, D R; Wang, Z; Wolfe, B; Albright, B J; Batha, S H; Palaniyappan, S.
Afiliação
  • Wong CS; Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
  • Strehlow J; Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
  • Broughton DP; Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
  • Luedtke SV; Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
  • Huang CK; Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
  • Bogale A; Center for Energy Research, University of California - San Diego, La Jolla, California 92093, USA.
  • Fitzgarrald R; Center for Ultrafast Optical Science, University of Michigan, Ann Arbor, Michigan 48109, USA.
  • Nedbailo R; Center for High Energy Density Science, University of Texas, Austin, Texas 78712, USA.
  • Schmidt JL; Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
  • Schmidt TR; Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
  • Twardowski J; Materials Science and Engineering, The Ohio State University, Columbus, Ohio 43210, USA.
  • Van Pelt A; Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
  • Alvarez MA; Center for High Energy Density Science, University of Texas, Austin, Texas 78712, USA.
  • Junghans A; Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
  • Mix LT; Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
  • Reinovsky RE; Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
  • Rusby DR; Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
  • Wang Z; Lawrence Livermore National Laboratory, Livermore, California 94551, USA.
  • Wolfe B; Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
  • Albright BJ; Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
  • Batha SH; Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
  • Palaniyappan S; Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
Rev Sci Instrum ; 95(2)2024 Feb 01.
Article em En | MEDLINE | ID: mdl-38341719
ABSTRACT
We present an inversion method capable of robustly unfolding MeV x-ray spectra from filter stack spectrometer (FSS) data without requiring an a priori specification of a spectral shape or arbitrary termination of the algorithm. Our inversion method is based upon the perturbative minimization (PM) algorithm, which has previously been shown to be capable of unfolding x-ray transmission data, albeit for a limited regime in which the x-ray mass attenuation coefficient of the filter material increases monotonically with x-ray energy. Our inversion method improves upon the PM algorithm through regular smoothing of the candidate spectrum and by adding stochasticity to the search. With these additions, the inversion method does not require a physics model for an initial guess, fitting, or user-selected termination of the search. Instead, the only assumption made by the inversion method is that the x-ray spectrum should be near a smooth curve. Testing with synthetic data shows that the inversion method can successfully recover the primary large-scale features of MeV x-ray spectra, including the number of x-rays in energy bins of several-MeV widths to within 10%. Fine-scale features, however, are more difficult to recover accurately. Examples of unfolding experimental FSS data obtained at the Texas Petawatt Laser Facility and the OMEGA EP laser facility are also presented.

Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2024 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2024 Tipo de documento: Article