Darmstadt 2016 – wissenschaftliches Programm
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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 11: Poster
AKBP 11.18: Poster
Mittwoch, 16. März 2016, 18:30–20:30, S1/05 22-24
Position map calculations of BPMs by CST Particle Studio for non-relativistic energies — •Peter Forck1,2, Mohammed Almalki1,2, Jun He3, Wolfgang Kaufmann1, Oliver Kester1,2, Thomas Sieber1, and Rahul Singh1 — 1GSI, Darmstadt, Germany — 2Goethe Universität Frankfurt, Germany — 3Institute of High Energy Physics, CAS Beijing, China
Beam positon monitors BPM at LINACs serve as the basic instrument for non-destructive position determination as yield from the difference-over-sum of signal of opposite electrodes. The time evolution of the signals, and consequently their Fourier-transformations, depend on the particle velocity and the distance from the electrodes. Position maps, i.e. electrodes difference-over-sum signal versus beam offset, were calculated using the wake-field solver CST Particle Studio in the velocity range from 0.05c to 0.5c for two BPM types. For the planned proton LINAC at FAIR, four separated button BPM electrodes are foreseen. The BPMs installed in the GSI UNILAC are made of a ceramic ring with four metallized sectors installed in a special housing. For the latter type resonances and capacitive coupling between the sectors modify the position map. The general findings and peculiarities of both types are presented.