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APS » Journals » Phys. Rev. Lett. » Volume 87 » Issue 13
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Phys. Rev. Lett. 87, 134801 (2001) [4 pages]

Suppression of the Sawtooth Instability in a Storage Ring by Free-Electron Laser: An Example of Nonlinear Stabilization by Noise

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R. Bartolini, G. Dattoli, L. Mezi, and A. Renieri
ENEA, Divisione Fisica Applicata, Centro Ricerche Frascati, CP 65, 00044 Frascati, Rome, Italy

M. Migliorati
Università di Roma I “La Sapienza,” Dipartimento Di Energetica, Via A. Scarpa 14, 00161 Rome, Italy

M. E. Couprie and G. De Ninno
LURE, Batiment 209D, University Paris sud, BP 14, 91898 Orsay, France
and Service de Photons, Atomes et Molecules DSM/Drecam, Batiment 522, 91191 Gif-sur-Yvette, France

R. Roux
LAL, University Paris sud, 918898 Orsay, France

Received 20 November 2000; published 10 September 2001

The stabilization of nonlinear excitations by noise is a topic of fundamental importance in many physical problems. We discuss a genuine example within the context of storage ring-free electron laser physics, by presenting a model which allows the characterization of the system evolution and the determination of the conditions leading to the suppression of instabilities of sawtooth type. The conclusions of the model are confirmed by a comparison with experimental results on the Super Aco Storage Ring-Free Electron Laser.

© 2001 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.87.134801
DOI:
10.1103/PhysRevLett.87.134801
PACS:
41.60.Cr, 29.20.Dh, 41.75.Fr
 
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