• Open Access

Multioctave high-dynamic range optical spectrometer for single-pulse, longitudinal characterization of ultrashort electron bunches

Omid Zarini, Jurjen Couperus Cabadağ, Yen-Yu Chang, Alexander Köhler, Thomas Kurz, Susanne Schöbel, Wolfgang Seidel, Michael Bussmann, Ulrich Schramm, Arie Irman, and Alexander Debus
Phys. Rev. Accel. Beams 25, 012801 – Published 20 January 2022

Abstract

We present design and realization of an ultrabroadband optical spectrometer capable of measuring the spectral intensity of multioctave-spanning light sources on a single-pulse basis with a dynamic range of up to eight orders of magnitude. The instrument is optimized for the characterization of the temporal structure of femtosecond long electron bunches by analyzing the emitted coherent transition radiation spectra. The spectrometer operates within the spectral range of 250 nm to 11.35μm, corresponding to 5.5 optical octaves. This is achieved by dividing the signal beam into three spectral groups, each analyzed by a dedicated spectrometer and detector unit. The complete instrument was characterized with regard to wavelength, relative spectral sensitivity, and absolute photometric sensitivity, always accounting for the light polarization and comparing different calibration methods. Finally, the capability of the spectrometer is demonstrated with a coherent transition radiation measurement of a laser wakefield accelerated electron bunch, enabling to determine temporal pulse structures at unprecedented resolution.

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  • Received 19 November 2020
  • Revised 8 November 2021
  • Accepted 12 November 2021

DOI:https://doi.org/10.1103/PhysRevAccelBeams.25.012801

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Accelerators & Beams

Authors & Affiliations

Omid Zarini1,2, Jurjen Couperus Cabadağ1, Yen-Yu Chang1, Alexander Köhler1, Thomas Kurz1,2, Susanne Schöbel1,2, Wolfgang Seidel1, Michael Bussmann1,3, Ulrich Schramm1,2, Arie Irman1,*, and Alexander Debus1,†

  • 1Helmholtz-Zentrum Dresden–Rossendorf, Bautzner Landstrasse 400, 01328 Dresden, Germany
  • 2Technische Universität Dresden, 01069 Dresden, Germany
  • 3Center for Advanced Systems Understanding, Untermarkt 20, 02826 Goerlitz, Germany

  • *A.Irman@hzdr.de
  • A.Debus@hzdr.de

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Vol. 25, Iss. 1 — January 2022

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