Abstract: The present invention refers to a method for detecting position and arrival time of accelerated particles, particularly in a linear particle accelerator, and to an apparatus for carrying out said method. When a correction is triggered, the apparatus according to the invention digitally processes a triggering signal by means of a programmable digital synthetic system being set in a manner that it is equivalent, referring to the time response, to the analogue correction signal received. The output from said synthetic system is deducted from the measurement, therefore, the correction signal is entirely deleted from the measurement. A special adaptive algorithm takes care for the time response compliance of the synthetic system with alterations in the analogue circuit generated due to the warming of the circuit itself.