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Optical Engineering

Coherent synchrotron radiation in the far-infrared from a 1 mm electron bunch
Author(s): Ake Andersson; Matthew S. Johnson; Bengt Nelander
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Paper Abstract

The coherent generation of synchrotron radiation by an electron storage ring is predicted for wavelengths equal to or longer than the electron bunch length. With typical bunch lengths of approximately 1 cm, diffraction and chamber-screening effects have so far blocked observation of coherent radiation from a conventional radiation beamline. In the low-energy, second-generation light source MAX-I, the magnet lattice has been tuned to a small momentum compaction factor, allowing rms bunch lengths as short as 1 mm. Here we report the coherent far-infrared emission observed from such a bunch. The paper discusses the origin of coherent synchrotron radiation for Gaussian and non-Gaussian electron bunches, and the procedure used to generate such bunches. The emission was characterized using the infrared beamline at MAX-I, including an interferometer, a liquid-helium-cooled bolometer detector, waveguide high-pass filters, and a conductive-grid polarization filter. The intensity of the coherent radiation is greater by a factor of 2x103 to 6x103 than normal incoherent synchrotron radiation, and is seen between 8 and 22 cm-1.

Paper Details

Date Published: 1 December 2000
PDF: 7 pages
Opt. Eng. 39(12) doi: 10.1117/1.1327498
Published in: Optical Engineering Volume 39, Issue 12
Show Author Affiliations
Ake Andersson, Lund Univ. (Sweden)
Matthew S. Johnson, Copenhagen Univ. (Denmark)
Bengt Nelander, Lund Univ. (Sweden)

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