Abstract
At the proton therapy facility PROSCAN of the Paul Scherrer Institute the energy modulation of the cyclotron generated proton beam is performed via material insertion into the beam trajectory. The energy spectrum of the particles propagating forwards after such procedure has been simulated and measured. The current paper summarizes the results of these simulations and measurements and illustrates their significance for the future developments of a gantry for proton therapy at the Paul Scherrer Institute.
Highlights
In the cyclotron driven proton therapy facilities the energy of the proton beam is often reduced by an energy degrader [1]
The results of the FLUKA simulation for the spectrum of the beam after degradation are consistent with the measurement results in the significant, high energy part of the spectrum
This indicates that the effects providing the largest contribution to the beam energy loss, incl. multiple nuclear scattering and the inelastic scattering, are correctly implemented in FLUKA and that FLUKA simulations can be used as a reliable tool for the further studies
Summary
In the cyclotron driven proton therapy facilities the energy of the proton beam is often reduced by an energy degrader [1]. There is a strong correlation between the particles’ horizontal position and their momentum at this location. This makes the horizontal collimator slit an effective energy selection collimator. Typically an Energy Selection System (ESS) is installed downstream of the degrader. This system comprises two dipoles, a set of quadrupoles and a horizontal collimator slit (see Fig. 2)
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