Device and method for the intensity control of a beam extracted from a particle accelerator

摘要

The beam intensity regulator includes an analogue-digital converter (50) which converts an analogue signal (IM) directly representing the measured beam intensity at the accelerator output into a digital signal (IR). A low pass filter filters the signal (IM) to produce a filtered analogue signal (IF). A phase advance regulator samples the signal (IF), compensates for the phase delay and provides the signal (IR) to a comparator (90) An Independent claim is also included for: a regulation method. Beam intensity regulator, for beams extracted from a particle accelerator such as a cyclotron, used for proton-therapy. The particles are generated from an ion source. Regulator includes: (a) a comparator (90) determining the difference ( eta ) between a digital signal (IR) representing beam intensity measured at the accelerator output and a set value of beam intensity (IC); a SMITH predictor (80) which determines from ( eta ), a corrected value beam intensity value (IP); an inverse correspondence table (40) furnishes, from the corrected value (IP). a value (IA) for supply of a current arc for the ion source (20).