Storage ring free electron laser dynamics in presence of an auxiliary harmonic radio frequency cavity C. A. Thomas, J. I.M. Botman, C. Bruni, G. Orlandi, G. de Ninno, D. Garzella and M. E. Couprie Eur. Phys. J. D, 32 1 (2005) 83-93 Published online: 04 January 2005 DOI: 10.1140/epjd/e2004-00200-6