Bochum 1998 – wissenschaftliches Programm
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HK: Hadronen und Kerne
HK 41: Application of Nuclear Techniques II
HK 41.3: Vortrag
Dienstag, 17. März 1998, 17:45–18:00, G
Investigation of Smith–Purcell radiation at the Mainz Microtron MAMI — •G. Kube1, H. Schöpe1, H. Backe1, N. Clawiter1, S. Dambach1, T. Doerk1, H. Euteneuer1, F. Hagenbuck1, K.-H. Kaiser1, O. Kettig1, M. Kretzschmar2, W. Lauth1, A. Steinhof1, and Th. Walcher1 — 1Institut für Kernphysik, Universitat Mainz, J.-J. Becher Weg 45, 55099 Mainz — 2Institut für Physik, Universität Mainz, Staudingerweg 7, D–55099 Mainz
Smith–Purcell radiation is generated if an electron beam passes close to the surface of a diffraction grating. The radiation has been investigated in the optical spectral range (λ = 360 nm and λ = 546 nm) with an 855 MeV beam, focused to a spot size of 4 µm (FWHM). Optical diffraction gratings with grating periods D = 0.833 µ m,9.09 µ m and blaze angles α = 0.8∘, 17∘, 41∘ were used. Smith–Purcell radiation has been separated from background components (as diffracted synchrotron radiation and transition radiation) by exploiting their specific emission characteristics. These are in particular the narrow emission cone in the direction perpendicular to the grating surface and the decay constant hint = λβγ/4 π of the intensity’s dependence on the distance between electron beam and grating surface. The intensity of the measured Smith–Purcell radiation is at variance with theoretical calculations [1],[2].
[1] P.M. van den Berg, J. Opt. Soc. Am. 63(6), 689 (1973)
[2] M. Kretzschmar, private communication, Mainz (1997)
supported by DFG(SFB201) and BMBF(06 MZ 566/9)