Abstract

The longitudinal charge distribution of an electron bunch can be determined from the coherent transition radiation emitted when the bunch crosses a thin metal foil. A Josephson junction made from a thin film of YBa/sub 2/Cu/sub 3/O/sub 7-x/ on a bicrystal substrate is used as a detector for transition radiation in the millimeter and submillimeter range. The spectral intensity of the radiation and the longitudinal form factor of the bunch are derived by applying a Hilbert transformation to the radiation-induced modification of the current-voltage characteristic of the Josephson junction. The physical principles of a Josephson junction as a detector for submillimeter radiation are outlined and a first bunch length measurement is presented.

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