Suppression effect of high energy electron radiation in a thin crystal

• Published in: Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms Vol. 119; no. 1; pp. 59 - 62
• Main Authors: Fomin, S.P., Jejcic, A., Maillard, J., Shul'ga, N.F., Silva, J.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.10.1996
• ISSN: 0168-583X; 1872-9584
• DOI: 10.1016/0168-583X(96)00047-X

The influence of multiple scattering on the radiation of high energy electrons in a thin layer of substance is being considered. It is shown that the radiation suppression, which appears in this case, though alike in nature differs from the Landau-Pomeranchuk effect (suppression effect of ultra relativistic electron bremsstrahlung in a boundless amorphous medium). It is also shown that “unexpected” shape of the radiation spectra for relatively thin targets, which was observed at the recent SLAC experiment E-146 (devoted to the verification of the Landau-Pomeranchuk effect), has a natural explanation due to the effect considered. It is pointed out that a similar effect takes place for coherent radiation in a thin crystal. Results of computer simulation show that its observation could be easier than that of the L-P effect. The effect increases significantly with the electron energy.