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Title: Continuous bunch-by-bunch spectroscopic investigation of the microbunching instability

Abstract

Electron accelerators and synchrotrons can be operated to provide short emission pulses due to longitudinally compressed or substructured electron bunches. Above a threshold current, the high charge density leads to the microbunching instability and the formation of substructures on the bunch shape. These time-varying substructures on bunches of picoseconds-long duration lead to bursts of coherent synchrotron radiation in the terahertz frequency range. Therefore, the spectral information in this range contains valuable information about the bunch length, shape and substructures. Based on the KAPTURE readout system, a 4-channel single-shot THz spectrometer capable of recording 500 million spectra per second and streaming readout is presented. First measurements of time-resolved spectra are compared to simulation results of the Inovesa Vlasov-Fokker-Planck solver. Finally, the presented results lead to a better understanding of the bursting dynamics especially above the micro-bunching instability threshold.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1]
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  1. Karlsruhe Inst. of Technology (KIT) (Germany)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1490384
Grant/Contract Number:  
AC02-76SF00515; VH-NG-320; 05K16VKA
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Accelerators and Beams
Additional Journal Information:
Journal Volume: 21; Journal Issue: 11; Journal ID: ISSN 2469-9888
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

Steinmann, Johannes L., Boltz, Tobias, Brosi, Miriam, Bründermann, Erik, Caselle, Michele, Kehrer, Benjamin, Rota, Lorenzo, Schönfeldt, Patrik, Schuh, Marcel, Siegel, Michael, Weber, Marc, and Müller, Anke-Susanne. Continuous bunch-by-bunch spectroscopic investigation of the microbunching instability. United States: N. p., 2018. Web. doi:10.1103/physrevaccelbeams.21.110705.
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Steinmann, Johannes L., Boltz, Tobias, Brosi, Miriam, Bründermann, Erik, Caselle, Michele, Kehrer, Benjamin, Rota, Lorenzo, Schönfeldt, Patrik, Schuh, Marcel, Siegel, Michael, Weber, Marc, & Müller, Anke-Susanne. Continuous bunch-by-bunch spectroscopic investigation of the microbunching instability. United States. https://doi.org/10.1103/physrevaccelbeams.21.110705
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Steinmann, Johannes L., Boltz, Tobias, Brosi, Miriam, Bründermann, Erik, Caselle, Michele, Kehrer, Benjamin, Rota, Lorenzo, Schönfeldt, Patrik, Schuh, Marcel, Siegel, Michael, Weber, Marc, and Müller, Anke-Susanne. Fri . "Continuous bunch-by-bunch spectroscopic investigation of the microbunching instability". United States. https://doi.org/10.1103/physrevaccelbeams.21.110705. https://www.osti.gov/servlets/purl/1490384.
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@article{osti_1490384,
title = {Continuous bunch-by-bunch spectroscopic investigation of the microbunching instability},
author = {Steinmann, Johannes L. and Boltz, Tobias and Brosi, Miriam and Bründermann, Erik and Caselle, Michele and Kehrer, Benjamin and Rota, Lorenzo and Schönfeldt, Patrik and Schuh, Marcel and Siegel, Michael and Weber, Marc and Müller, Anke-Susanne},
abstractNote = {Electron accelerators and synchrotrons can be operated to provide short emission pulses due to longitudinally compressed or substructured electron bunches. Above a threshold current, the high charge density leads to the microbunching instability and the formation of substructures on the bunch shape. These time-varying substructures on bunches of picoseconds-long duration lead to bursts of coherent synchrotron radiation in the terahertz frequency range. Therefore, the spectral information in this range contains valuable information about the bunch length, shape and substructures. Based on the KAPTURE readout system, a 4-channel single-shot THz spectrometer capable of recording 500 million spectra per second and streaming readout is presented. First measurements of time-resolved spectra are compared to simulation results of the Inovesa Vlasov-Fokker-Planck solver. Finally, the presented results lead to a better understanding of the bursting dynamics especially above the micro-bunching instability threshold.},
doi = {10.1103/physrevaccelbeams.21.110705},
journal = {Physical Review Accelerators and Beams},
number = 11,
volume = 21,
place = {United States},
year = {Fri Nov 30 00:00:00 EST 2018},
month = {Fri Nov 30 00:00:00 EST 2018}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1103/physrevaccelbeams.21.110705
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Figures / Tables:

FIG. 1 FIG. 1: $Inovesa$ simulation: Average emitted power spectral density (PSD) for different bunch currents. The contour lines are in 5 dB distance between −85 dBm and −130 dBm.
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    From self-organization in relativistic electron bunches to coherent synchrotron light: observation using a photonic time-stretch digitizer
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      Figures / Tables found in this record:

      FIG. 1 (p. 2)figure
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      FIG. 5. (p. 4)figure
      TABLE I (p. 4)table
      FIG. 6 (p. 5)figure
      TABLE II (p. 5)table
      FIG. 7 (p. 6)figure
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      FIG. 10 (p. 8)figure
      FIG. 11 (p. 9)figure
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