Direct Observation of Spatiotemporal Dynamics of Short Electron Bunches in Storage Rings

In recent synchrotron radiation facilities, the use of short (picosecond) electron bunches is a powerful method for producing giant pulses of terahertz coherent synchrotron radiation. Here we report on the first direct observation of these pulse shapes with a few picoseconds resolution, and of their...

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Bibliographic Details
Published in:Physical review letters 2017-02, Vol.118 (5), p.054801-054801, Article 054801
Main Authors: Evain, C, Roussel, E, Le Parquier, M, Szwaj, C, Tordeux, M-A, Brubach, J-B, Manceron, L, Roy, P, Bielawski, S
Format: Article
Language:English
Subjects:
Accelerator Physics
Broadband
Coherence
Dynamics
Emission
Physics
Pulse shape
Recording
Stemming
Synchrotron radiation
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Summary:In recent synchrotron radiation facilities, the use of short (picosecond) electron bunches is a powerful method for producing giant pulses of terahertz coherent synchrotron radiation. Here we report on the first direct observation of these pulse shapes with a few picoseconds resolution, and of their dynamics over a long time. We thus confirm in a very direct way the theories predicting an interplay between two physical processes. Below a critical bunch charge, we observe a train of identical THz pulses (a broadband Terahertz comb) stemming from the shortness of the electron bunches. Above this threshold, a large part of the emission is dominated by drifting structures, which appear through spontaneous self-organization. These challenging single-shot THz recordings are made possible by using a recently developed photonic time stretch detector with a high sensitivity. The experiment has been realized at the SOLEIL storage ring.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.118.054801