The article "The control of a spatio-temporal instability affecting the relativistic electron packets used in synchrotron radiation centers" by DYSCO in Nature Physics.
The relativistic electron packets at the origin of synchrotron radiation are complex media, in which spatial structures appear spontaneously as soon as the number of electrons stored in a packet is large. These structures allow electrons to emit very intense coherent radiation in the terahertz domain. However, in the majority of cases, these structures appear in the form of irregular puffs, which makes this radiation unusable in practice. Collaboration with the SOLEIL synchrotron has made it possible to demonstrate the possibility of eliminating these instabilities by using chaos control techniques. The structures thus obtained are regular and the terahertz radiation emitted is almost constant. This stabilization is a first step towards a new source of intense terahertz for users.