1. Storage ring free electron laser dynamics in presence of an auxiliary harmonic radio frequency cavity
- Author
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Christelle Bruni, G.L. Orlandi, de G Ninno, M.E. Couprie, Cyrille Thomas, Jim Jan Botman, D. Garzella, and Coherence and Quantum Technology
- Subjects
Physics ,business.industry ,Gain ,Free-electron laser ,Physics::Optics ,Laser ,Atomic and Molecular Physics, and Optics ,law.invention ,Optics ,law ,Harmonic ,Physics::Accelerator Physics ,Radio frequency ,Laser beam quality ,business ,Beam (structure) ,Storage ring - Abstract
In a Storage Ring Free Electron Laser (SRFEL) there is a strong interdependence between the laser beam and the electron beam from which the laser is generated. The Super ACO storage ring has a second Radio Frequency (RF) cavity at the 5th harmonic of the main RF cavity. It is used to shorten the bunch length, thereby enhancing the laser gain. Employing this RF harmonic cavity instabilities are observed with a strong effect on both the laser radiation properties and the electron beam behaviour. In this paper, we first present beam characteristics of Super-ACO as influenced by the harmonic cavity, and the instabilities of the beam due to this RF cavity. Then we discuss the FEL properties in presence of the harmonic RF cavity. In general the harmonic cavity functions as intended, and it is observed that the laser suppresses the instabilities caused by the harmonic cavity in the absence of the FEL.PACS: 41.60.Cr Free-electron lasers - 05.45.-a Nonlinear dynamics and nonlinear dynamical systems - 29.20.Dh Storage rings - 41.75.Fr Electron and positron beams
- Published
- 2005