Radiation produced by electrons making multiple passes through thin internal targets in the Tomsk Synchrotron

It is shown experimentally and theoretically that the use of thin (approximately 10^-3 r.l.) internal targets in a synchrotron results in electrons making multiple passes through them during each shot. The number of passes the electrons make is determined by their energy, the synchrotron parameters, and the thickness, structure, and material of the target, and gives rise to an increase in the effective thickness of the target. Using a scraper (a thick movable target at a given azimuth of the synchrotron) allows the electrons to make a single pass, which permits the spectral and angular properties of the γ-radiation from the electrons to be studied in connection with thin single crystals in which the effect of dechanneling can be ignored.