METHOD AND DEVICE FOR GENERATING BREMSSTRAHLUNG

摘要

The invention relates to a method and a device, which can be used in inspection systems, for generating bremsstrahlung with a pulse-to-pulse variation in energy level between two given values with the possibility of independently controlling the radiation intensity for each energy level. The device has local radiation shielding (16) and provides for a small diameter beam on the braking target (12) as well as highly efficient particle acceleration. The device comprises an accelerator structure (7) with a standing wave, which is powered by a compact multibeam klystron (22) having a low beam voltage and permanent magnet focusing. The energy level of an accelerated beam (19) of charged particles is varied at a constant frequency by varying the output power level of the klystron (22) from pulse to pulse and the amplitude of the field in the accelerator structure (7). The required radiation intensity is provided by the pulse-to-pulse variation of the voltage of the control electrode (10) of an electron gun (8) and of the current intensity of the beam injected into the accelerator structure (7).