Abstract
The medical cyclotron at the Bern University Hospital (Inselspital) is used for both routine 18 F production for Positron Emission Tomography (PET) and multidisciplinary research. It provides proton beams of variable intensity at a nominal fixed energy of 18 MeV. Several scientific activities, such as the measurement of nuclear reaction cross-sections or the production of non-conventional radioisotopes for medical applications, require a precise knowledge of the energy of the beam extracted from the accelerator. For this purpose, a study of the beam energy was performed as a function of cyclotron operational parameters, such as the magnetic field in the dipole magnet or the position of the extraction foil. The beam energy was measured at the end of the 6 m long Beam Transfer Line (BTL) by deflecting the accelerated protons by means of a dipole electromagnet and by assessing the deflection angle with a beam profile detector.
Highlights
The accurate knowledge of the energy of a particle beam extracted from an accelerator is fundamental for several scientific activities
We report on the use of this technique to study the extracted beam energy as a function of two operational parameters of the cyclotron: the strength of the dipole magnetic field and the position of the extraction foil
The energy variation in resonance condition due to the change of the cyclotron magnetic field can be estimated to be of the order of 160 keV, under the assumption of linearity between main coil current and cyclotron magnetic field
Summary
The accurate knowledge of the energy of a particle beam extracted from an accelerator is fundamental for several scientific activities. It is crucial for the research program focused on the measurement of nuclear reaction cross-sections or the production of radioisotopes of medical interest ongoing at the compact medical cyclotron in operation at the Bern University Hospital (Inselspital). A further measurement was performed based on Rutherford backscattering (RBS) [6] These studies suggested a dependence of the extracted beam energy with respect to the magnetic field in the cyclotron main coil, which determines the resonance conditions. The position of the extraction foil has an influence
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