Modeling of high-energy ion beam energy spectrum evolution induced by passive elements

Résumé fourni par la source

Although particle accelerators support adjusting the energy of the charged particles directly, a finer energy resolution can be achieved with passive elements (degraders). However, this method disperses the energy distribution. Using a simplified stopping power law valid over part of the Bethe-Bloch regime at the lower end, we developed an analytical model for the energy distribution as function of traversed distance. We show the model’s predictive capabilities using simulation data from Gate/Geant4. Among other results, 10 energy distributions (mean energies from > 170 MeV to < 25 MeV) were predicted with r 2 > 0 . 98 when using only the initial distribution (no degrader) and literature data as input. From the predicted distributions, the fraction of remaining primaries was estimated with r 2 > 0 . 998 . This quantity is essential for many applications, e.g. single event effect testing using the variable-depth Bragg peak method.

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