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Development of Detector for Ultra-Fast Beam Diagnostics in Proton Radiotherapy

V Iakovenko1,2*, D Jaffray2,3,4 , (1) Sunnybrook Health Sciences Centre, Toronto, ON, (2) University of Toronto, Toronto, ON, (3) University Health Network, Toronto, ON, (4) Techna Institute, Toronto, ON


(Sunday, 7/14/2019) 3:30 PM - 4:00 PM

Room: Exhibit Hall | Forum 6

Purpose: To develop a detector for ultra-fast beam space-time structure analysis that leverages high speed photonics and defines structure intrinsic to the proton pulse generation systems in modern and next generation proton medical accelerators.

Methods: Next generation of hadron accelerators will be delivering high flux pulsed beams, which requires improvement of real-time beam monitoring devices. A method of using ultra-fast scintillating plate to detect a temporal fine structure of the beam is described. Traversing the scintillating volume, protons create a photonic signal that will be collected on the corners of the scintillating plate and transmitted further through optical fibers and readout with a single photo-multiplier tube (PMT). We propose creating optical delays by introducing optical fibers of different lengths, therefore it will be possible to reconstruct the energy and position of a proton beam traversing scintillator from the signal pulse train.

Results: Beam micro-structures of the TRIUMF cyclotron and synchrotron at Heidelberg Heavy-Ion Therapy Centre were used to estimate timing requirements for detector system. Photonic signal and transport were simulated in Matlab, considered 5 types of scintillators, 3 ultra-fast PMTs from Hamamatsu and high-speed digitizers from Cronologic and National Instruments. Two alternative designs are proposed: single plated beam monitor, intended to measure parameters of the proton beam from the nozzle to the patient, should be compatible for in-beam use; and multi-plate phantom for quality control to measure beam energy and position of the Bragg peak with 1 mm precision.

Conclusion: The results of our simulation suggest the possibility for diagnostics of scanning proton beams using beam temporal micro-structure. Based on simulation we expect to build a prototype to validate our prediction.


Photon Detectors, Protons, Scintillators


IM- Multi-modality imaging systems: Development (new technology and techniques)

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