A Non-Invasive Online Method for Real-Time Determination of the Most Probable Energy (MPE) of Industrial Electron Beams
Abstract
A non-invasive method for real-time determination of the most probable energy (MPE) of industrial electron beams is presented. The method is based on the use of beam energy dispersion in a scanning magnetic field combined with local detection of beam intensity using a thin collecting electrode. Due to the lack of synchronization between the accelerator pulse generator and the scanning magnet, the beam is sampled in an asynchronous manner, allowing reconstruction of the spatial and energy distribution through signal accumulation. Two methods for MPE determination were investigated: local parabolic approximation and a centroid-based approach. The latter was found to be more robust under noisy industrial conditions and provided superior repeatability. Application of the method to an industrial linear accelerator demonstrated that the beam energy exhibits significant temporal fluctuations. The proposed method provides a direct, real-time measure of effective beam energy and can be used as an operational parameter for accelerator tuning and process control. It complements standard dosimetric techniques by enabling continuous monitoring of beam energy under normal operating conditions.
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