68 A New Transparent Beam Profiler Based on Secondary Electrons Emission for Hadrontherapy Charged Particles Beams

Introduction. Beam profiling during patient treatment in hadrontherapy requires ultra-thin monitors to preserve the high beam quality. For detectors upstream in the line, a material budget as low as ∼ 15 μ m water-equivalent is needed. Besides, the current trend of dose escalation to treat highly resistant tumors implies challenging requirements to the monitor in terms of radiation hardness and dynamic range.