Phys. Rev. ST Accel. Beams 5, 072802 (2002) [8 pages]Determination of longitudinal bunch shape by means of coherent Smith-Purcell radiation |
PRL Celebrates 50 Years
This Week's Milestone Letters are from 1974: |
G. Doucas
Sub-Department of Particle Physics, University of Oxford, Oxford OX1 3RH, United Kingdom
M. F. Kimmitt
Physics Centre, University of Essex, Colchester CO4 3SQ, United Kingdom
A. Doria, G. P. Gallerano, E. Giovenale, and G. Messina
ENEA, Divisione Fisica Applicata, P.O. Box 65, 00044 Frascati, Italy
H. L. Andrews and J. H. Brownell
Department of Physics & Astronomy, Dartmouth College, Hanover, New Hampshire 03755-3528
Received 11 May 2002; published 24 July 2002
Coherent enhancement of the Smith-Purcell radiation produced from the interaction of a 1.8 MeV electron beam with a grating has been observed. The emitted radiation has been measured at angles in the 40° to 120° range, which correspond to wavelengths from 0.65 to 4 mm, approximately. The radiated power was 320 mW at 90°. Its angular distribution agrees well with the description of the process in terms of induced surface currents and has been used to infer the longitudinal profile of the electron bunch. It is concluded that the bunch has an approximately triangular profile, with 85% of the bunch particles contained within 14 ps. The possibilities of the technique as a bunch-shape diagnostic tool are also discussed.
©2002 The American Physical Society
URL: http://link.aps.org/abstract/PRSTAB/v5/e072802
DOI: 10.1103/PhysRevSTAB.5.072802
PACS: 41.60.-m, 41.75.Ht, 29.27.Fh
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