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  Fanselow, T.; Bundesmann, J.; Denker, A.; Dittwald, A.; Hiller, U.: Design and Operation of the New Fast Beam Chopper between Tandetron and Cyclotron. In: Tianjue Zhang ... [Ed.] : CYC2022 : Proceedings of the 23rd International Conference on Cyclotrons and their Applications, CIAE, Beijing, China and held remotelyGeneve: JACoW, 2023. - ISBN 978-3-95450-212-7, p. MOPO011/1-4

Open Access Version

Abstract:
In collaboration with Charite - Universitätsmedizin Berlin, patients with ocular melanomas are treated with protons at Helmholtz Zentrum Berlin. Accompanying research includes beam delivery for Flash irradiation, thus it became necessary to set up a fast and reliable beam chopper. The new beam chopper can deliver much shorter pulses than needed for Flash irradiation, minimum pulse widths down to 70ns at 1kV amplitude can be delivered. A short description of the design and installation process, which occurred in 2020, and the experiences of the first 2 years of operation with the new fast beam chopper system is presented.