Electron synchrotron radiation in the far infrared

Journal Article · Wed Apr 15 00:00:00 EDT 1987 · Phys. Rev. D; (United States)

DOI:https://doi.org/10.1103/PhysRevD.35.2584· OSTI ID:6006122

Wingham, D J

Recent installations at a number of synchrotron light facilities have extended the use of the synchrotron radiation spectrum into the far infrared. At these low frequencies, it is not self-evident that the high-frequency, far-field expressions used normally to describe the synchrotron spectrum are valid. In this paper this question is examined. The near-field distance of the synchrotron source, analogous to the Rayleigh distance of conventional sources, is derived. It is shown that at wavelengths from cm to mm/sup -1/ this distance is of the order of 1 m, which is sufficient to influence the siting of an initial aperture. The effect of the finite length of the curved sections of the electron orbit is investigated and it is shown that structure on the +- 10-dB level is introduced into the spectrum at these wavelengths. Finally, the temporal and spatial coherence of the field is examined. It is demonstrated that no coherent radiation is to be expected from the synchrotron at these wavelengths, but that at mm wavelengths the field will be spatially coherent over apertures of order 100 mrad.

• Research Organization: Department of Physics and Astronomy, Mullard Space Science Laboratory, University College London, Holmbury Saint Mary, Dorking, Surrey, RH5 6NT England
• OSTI ID: 6006122
• Journal Information: Phys. Rev. D; (United States), Vol. 35:8
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
SYNCHROTRON RADIATION SOURCES
INFRARED SPECTRA
COHERENT RADIATION
ELECTRONS
FAR INFRARED RADIATION
RELATIVISTIC RANGE
STATISTICAL MODELS
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
INFRARED RADIATION
LEPTONS
MATHEMATICAL MODELS
RADIATION SOURCES
RADIATIONS
SPECTRA
430303* - Particle Accelerators- Experimental Facilities & Equipment