Accession Number : ADP005100

Title :   Optics for Insertion-Device Beam Lines,

Corporate Author : NAVAL WEAPONS CENTER CHINA LAKE CA

Personal Author(s) : Rehn,Victor

Report Date : OCT 1985

Pagination or Media Count : 13

Abstract : This paper presents an overview of optical, thermal, and mechanical problems encountered with optical elements in beams of synchrotron radiation (SR) emitted by electron sidewinders such as wigglers, undulators, and free electron lasers (FELs). Perhaps the most challenging problem is the management of the high power densities from wigglers without degradation of the optical quality of the beam. Another challenging problem is the reduction of near specular scattering by surface microroughness on the mirrors. Near specular scattering becomes more important as the degree of coherence and collimation to be maintained increases from bend magnet SR to undulator and FEL radiation. It is emphasized that the surface autocovariance length of the mirror is the determiner of the angular distribution of scattering, and that very long autocovariance lengths are required for highly coherent SR beams.

Descriptors :   *PARTICLE ACCELERATOR COMPONENTS, *BEAM STEERING, SYNCHROTRONS, COHERENT RADIATION, FREE ELECTRON LASERS, COVARIANCE, LIGHT SCATTERING, MIRRORS

Distribution Statement : APPROVED FOR PUBLIC RELEASE