Dresden 2013 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 69: Instrumentation
HK 69.3: Vortrag
Donnerstag, 7. März 2013, 14:45–15:00, WIL-A221
Development of a Compton Camera for online monitoring and dosimetry of laser-accelerated proton beams* — •Peter G. Thirolf1, Christian Lang1, Saad Aldawood1, Dietrich Habs1,2, Ludwig Maier3, and Katia Parodi1 — 1LMU München — 2MPI f. Quantenoptik, Garching — 3TU München
A Compton camera is presently under construction in Garching, designed for monitoring and dosimetry of laser-accelerated protons for bio-medical applications via position-resolved prompt γ-ray detection. When ion beams suitable for hadron therapy (protons, carbon ions) interact with tissue (or tissue-equivalent plastic or water phantoms), nuclear reactions induce prompt γ rays that can be utilized, e.g., to verify the ion beam range (i.e. monitor the Bragg peak position) by exploiting the Compton scattering kinematics of these photons. Our Compton camera (formed by a combination of scatter and absorber detector) consists of a stack of six double-sided Si-strip detectors (50x50 mm2, 0.5 mm thick, 128 strips/side, pitch 390 µm) acting as scatterers, while the absorber is formed by a LaBr3 scintillator crystal (50x50x30 mm3), read out by a (8x8) pixelated multi-anode PMT. Simulation results for design specifications and expected values of resolution and efficiency will be presented, as well as the status of the prototype presently under construction.
* supported by the DFG Cluster of Excellence MAP (Munich-centre for Advanced Photonics)