Trapp

This paper reports on the Trapp facility based on a 300 MeV proton synchrotron with two operation modes. The tomography mode serves for making a density map of a patient in the tumour plane by proton tomography. The irradiation mode allows a proton irradiation of targets of any size located in an arbitrary site of the human body. In the first variant a patient is sitting in an armchair with a vertical axis of rotation. An extracted beam can scan in a horizontal plant. For the tomography mode slow extraction of the beam is used. The integrated density of the patient in a given direction is determined from the energies at the body input and output. The time planned for one tomogram is 3-5 minutes. In the irradiation mode both the Bragg peak and punch-through can be used. In both operation modes the proton energy is varied by the variation of the synchrotron energy. Use of tomograms allows the computer control of the irradiation process