| Issue |
EPL
Volume 98, Number 4, May 2012
|
|
|---|---|---|
| Article Number | 40006 | |
| Number of page(s) | 5 | |
| Section | General | |
| DOI | https://doi.org/10.1209/0295-5075/98/40006 | |
| Published online | 23 May 2012 | |
Spatio-temporal dynamics of relativistic electron bunches during the micro-bunching instability in storage rings
Synchrotron SOLEIL - Saint Aubin, BP 34, 91192 Gif-sur-Yvette, France, EU
a
Clement.Evain@phlam.univ-lille1.fr
Received:
25
November
2011
Accepted:
17
April
2012
The intense Coherent Synchrotron Radiation emitted in the Terahertz range by relativistic electron bunches circulating in a storage ring is an attractive source for spectroscopy. Its stability is related to the electron bunch dynamics, and can exhibit a bursting behavior resulting from the irregular presence of micro-structures in the bunch. We evidence here the existence of two thresholds in the electron bunch spatio-temporal dynamics, associated with different levels of Terahertz signal fluctuations, with increasing number of electrons. The first threshold indicates the presence of micro-structures drifting in the bunch profile, and the second one appears when those micro-structures are strong enough to persist after about half a revolution period of the electron-bunch in the phase-space. Their prediction thanks to numerical simulations are confirmed by experiments at the synchrotron SOLEIL.
PACS: 05.45.-a – Nonlinear dynamics and chaos / 29.20.db – Storage rings and colliders / 41.60.Cr – Free-electron lasers
© EPLA, 2012
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