Designing and investigation of targets for the purpose of photoactivation analysis using the power ful beam of accelerated electrons

Results of investigation and long-time operation of a target system consisting of tungsten targets at the LUEh-8-5A electron linac at 8 MeV electron beam energy, 5.6 kW beam mean power and 700 μA beam mean current are given. Leakage through a target and appearance of microcrackings in the target were taken as durability criterium. Different modes of the target system operation were studied: with fixed beam and targets, with fixed beam and rotating targets as well as with rotating electron beam and fixed targets. It is shown that durability of target system with electron beam rotation by a magnetic field exceeded 400 h. Two-year operation has demonstrated that the number of failures may be reduced to zero under conditions of timely preventive maintenance and replacement of targets completed their lifetime