Tommaso Stefano Carzaniga

A detector based on silica fibers for ion beam monitoring in a wide current range

A detector based on doped silica and optical fibers was developed to monitor the profile of particle accelerator beams of intensity ranging from 1 pA to tens of μA. Scintillation light produced in a fiber moving across the beam is measured, giving information on its position, shape and intensity. The detector was tested with a continuous proton beam at the 18 MeV Bern medical cyclotron used for radioisotope production and multi-disciplinary research. For currents from 1 pA to 20 μA, Ce3+ and Sb3+ doped silica fibers were used as sensors. Read-out systems based on photodiodes, photomultipliers and solid state photomultipliers were employed. Profiles down to the pA range were measured with this method for the first time. For currents ranging from 1 pA to 3 μA, the integral of the profile was found to be linear with respect to the beam current, which can be measured by this detector with an accuracy of ~1%. The profile was determined with a spatial resolution of 0.25 mm. For currents ranging from 5 μA to 20 μA, thermal effects affect light yield and transmission, causing distortions of the profile and limitations in monitoring capabilities. For currents higher than ~1 μA, non-doped optical fibers for both producing and transporting scintillation light were also successfully employed.

Measurement of 43Sc and 44Sc production cross-section with an 18 MeV medical PET cyclotron

43Sc and 44Sc are positron emitter radionuclides that, in conjunction with the β- emitter 47Sc, represent one of the most promising possibilities for theranostics in nuclear medicine. Their availability in suitable quantity and quality for medical applications is an open issue and their production with medical cyclotrons represents a scientific and technological challenge. For this purpose, an accurate knowledge of the production cross sections is mandatory. In this paper, we report on the cross section measurement of the reactions 43Ca(p,n)43Sc, 44Ca(p,2n) 43Sc, 46Ti(p,α)43Sc, and 44Ca(p,n)44Sc at the Bern University Hospital cyclotron. A study of the production yield and purity performed by using commercially available enriched target materials is also presented.

A system for online beam emittance measurements and proton beam characterization

A system for online measurement of the transverse beam emittance was developed. It is named

Cross-section measurement of 44Sc,47Sc, 48Sc and 47Ca for an optimized 47Sc production with an 18 MeV medical PET cyclotron

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UniBEaM: A silica fiber monitor for charged particle beams

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Proton scattering radiography using an emulsion detector: a feasibility study.

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Study of the Transverse Beam Emittance of the Bern Medical Cyclotron

aM (4-Profiler Online Beam Emittance Measurement) and was conceived to measure the emittance in a fast and efficient way using the multiple beam profiler method. The core of the system is constituted by four consecutive UniBEaM profilers, which are based on silica fibers passing across the beam. The

High Efficiency Cyclotron Trap Assisted Positron Moderator

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A facility for radiation hardness studies based on the Bern medical cyclotron

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Testing the radiation hardness of thick-film resistors for a time-of-flight mass spectrometer at jupiter with 18 MeV protons

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