Physics – Accelerator Physics
Scientific paper
2001-06-13
Physics
Accelerator Physics
18 pages, 1 figures, Submitted to Nuclear Instruments and Methods in Physics Research Section A
Scientific paper
10.1016/S0030-4018(02)01910-7
In the framework of the pseudophotons method and under the hypothesis of the far field approximation the formal evaluation of the transition radiation spectrum produced by a three-dimensional charged beam interacting with a metallic target is carried out. When spatial incoherent conditions are occurring, the transverse size of a three-dimensional beam affects the spectrum via a suitable dependence on the Fourier transform of the transverse distribution, while the temporal coherent enhance of the spectrum depends only on the longitudinal beam size via the longitudinal form factor in the same manner as in the case of a one-dimensional beam. Spatial incoherent effects, arising at short wave-length in the spectrum, on the one hand allow a better comprehension of some aspects of the transition radiation phenomelogy - e.g. an analytical formula for the total radiated energy - and on the other hand offer new perspectives in the practical application of the transition radiation as diagnostics method of the transverse beam size in a particle accelerator.
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