Detection and clustering of light charged particles via System Identification techniques

Previdi F., S.M. Savaresi, P. Guazzoni, L. Zetta

The problem considered in this work is the classification of the particles produced by the collision of a
heavy ion beam on a target. Each particle is captured by a detector and results in a signal (which is the
impulse response of a dynamic linear system), which is measured by a digital acquisition system. The
assumption made herein is that the shape of the impulse-response contains complete information on
the particle, and the classification can be done by pulse-shape, analysis.
In this work, a complete procedure for the particle identification is proposed. The main idea is to use the
cascade of a state-space identification algorithm and a parametric non-linear map using the model
parameters as input regressors. The algorithm has been tested on a large set of impulse-responses and
provides a fully automatic accurate classification of the isotopes.
This work focuses on isotopic identification of the most energetic light charged particles (LCP). All the
experiments are made with the large detector array CHIMERA (Charge Heavy Ions Mass and Energy
Resolving Array).