IBIC2015 - List of Authors (Evain, C.)

Paper	Title	Page
MOCLA01	Microbunching Instability in Relativistic Electron Bunches: Direct Observations of the Microstructures Using Ultrafast YBCO Detectors	17
	E. Roussel, S. Bielawski, C. Evain, C. Szwaj PhLAM/CERLA, Villeneuve d'Ascq, France M. Adachi, M. Katoh, S.I. Kimura, T. Konomi UVSOR, Okazaki, Japan M. Hofherr, K.S. Ilin, J. Raasch, A. Scheuring, M. Siegel, P. Thoma, S. Wuensch KIT, Karlsruhe, Germany M. Hosaka, Y. Takashima, N. Yamamoto Nagoya University, Nagoya, Japan H. Zen Kyoto University, Kyoto, Japan
	Relativistic electron bunches circulating in accelerators are subjected to a dynamical instability leading to microstructures at millimeter to centimeter scale. Although this is a well-known fact, direct experimental observations of the structures, or the field that they emit, remained up to now an open problem. Here, we report the direct, shot-by-shot, time-resolved recording of the shapes (including envelope and carrier) of the pulses of coherent synchrotron radiation that are emitted, and that are a 'signature' of the electron bunch microstructure. The experiments are performed on the UVSOR-III storage ring, using electrical field sensitive YBa2Cu3O7−x thin-film ultrafast detectors. The observed patterns are subjected to permanent drifts, that can be explained from a reasoning in phase space, using macroparticle simulations. http://dx.doi.org/10.1103/PhysRevLett.113.094801
	Slides MOCLA01 [37.745 MB]
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MOPB006	Electro-Optical Measurements of the Longitudinal Bunch Profile in the Near-Field on a Turn-by-Turn Basis at the Anka Storage Ring	33
	E. Roussel, S. Bielawski PhLAM/CERCLA, Villeneuve d'Ascq Cedex, France A. Borysenko, N. Hiller, A.-S. Müller, P. Schönfeldt, J.L. Steinmann KIT, Karlsruhe, Germany C. Evain, C. Szwaj PhLAM/CERLA, Villeneuve d'Ascq, France
	Funding: This work is partially funded by the German Federal Ministry of Education and Research (BMBF) under contract numbers: 05K10VKC, 05K13VKA. ANKA is the first storage ring worldwide with a near-field single-shot electro-optical bunch profile monitor. Previously, the method of electro-optical spectral decoding (EOSD) was employed to record single-shot longitudinal bunch profiles. The readout rate of the required spectrometer detector system limited the acquisition rate to a few Hz and thus did not allow us to study the evolution of the longitudinal bunch shape on a turn-by-turn basis. The setup at ANKA was combined with the novel method of photonic time-stretch* for which the modulated laser pulse is not detected in the spectral domain, but stretched to a few nanoseconds by a long fiber and, subsequently, detected in the time domain. This method allows the sampling of the longitudinal bunch profile on a turn-by-turn basis for several milliseconds, uninterrupted. Here, we present first results obtained with the photonic time-stretch method in the near-field at the ANKA storage ring. * "Observing microscopic structures of a relativistic object using a time-stretch strategy," E. Roussel et al, Scientific Reports 5, 10330 (2015).
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Paper

Title

Page

Microbunching Instability in Relativistic Electron Bunches: Direct Observations of the Microstructures Using Ultrafast YBCO Detectors

17

E. Roussel, S. Bielawski, C. Evain, C. Szwaj
PhLAM/CERLA, Villeneuve d'Ascq, France
M. Adachi, M. Katoh, S.I. Kimura, T. Konomi
UVSOR, Okazaki, Japan
M. Hofherr, K.S. Ilin, J. Raasch, A. Scheuring, M. Siegel, P. Thoma, S. Wuensch
KIT, Karlsruhe, Germany
M. Hosaka, Y. Takashima, N. Yamamoto
Nagoya University, Nagoya, Japan
H. Zen
Kyoto University, Kyoto, Japan

Relativistic electron bunches circulating in accelerators are subjected to a dynamical instability leading to microstructures at millimeter to centimeter scale. Although this is a well-known fact, direct experimental observations of the structures, or the field that they emit, remained up to now an open problem. Here, we report the direct, shot-by-shot, time-resolved recording of the shapes (including envelope and carrier) of the pulses of coherent synchrotron radiation that are emitted, and that are a 'signature' of the electron bunch microstructure. The experiments are performed on the UVSOR-III storage ring, using electrical field sensitive YBa2Cu3O7−x thin-film ultrafast detectors. The observed patterns are subjected to permanent drifts, that can be explained from a reasoning in phase space, using macroparticle simulations.
http://dx.doi.org/10.1103/PhysRevLett.113.094801

Slides MOCLA01 [37.745 MB]

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MOPB006

Electro-Optical Measurements of the Longitudinal Bunch Profile in the Near-Field on a Turn-by-Turn Basis at the Anka Storage Ring

33

E. Roussel, S. Bielawski
PhLAM/CERCLA, Villeneuve d'Ascq Cedex, France
A. Borysenko, N. Hiller, A.-S. Müller, P. Schönfeldt, J.L. Steinmann
KIT, Karlsruhe, Germany
C. Evain, C. Szwaj
PhLAM/CERLA, Villeneuve d'Ascq, France

Funding: This work is partially funded by the German Federal Ministry of Education and Research (BMBF) under contract numbers: 05K10VKC, 05K13VKA.
ANKA is the first storage ring worldwide with a near-field single-shot electro-optical bunch profile monitor. Previously, the method of electro-optical spectral decoding (EOSD) was employed to record single-shot longitudinal bunch profiles. The readout rate of the required spectrometer detector system limited the acquisition rate to a few Hz and thus did not allow us to study the evolution of the longitudinal bunch shape on a turn-by-turn basis. The setup at ANKA was combined with the novel method of photonic time-stretch* for which the modulated laser pulse is not detected in the spectral domain, but stretched to a few nanoseconds by a long fiber and, subsequently, detected in the time domain. This method allows the sampling of the longitudinal bunch profile on a turn-by-turn basis for several milliseconds, uninterrupted. Here, we present first results obtained with the photonic time-stretch method in the near-field at the ANKA storage ring.
* "Observing microscopic structures of a relativistic object using a
time-stretch strategy," E. Roussel et al, Scientific Reports 5, 10330
(2015).

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reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text, ※ RIS/RefMan, ※ EndNote (xml)