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@inproceedings{singh:ibic2022-tup25, author = {R. Singh and P. Forck and S. Klaproth and T. Reichert and A. Reiter and G.O. Rodrigues}, title = {{Simulation and Measurements of the Fast Faraday Cups at GSI UNILAC}}, & booktitle = {Proc. IBIC'22}, booktitle = {Proc. 11th Int. Beam Instrum. Conf. (IBIC'22)}, pages = {286--290}, eid = {TUP25}, language = {english}, keywords = {electron, simulation, target, heavy-ion, coupling}, venue = {Kraków, Poland}, series = {International Beam Instrumentation Conference}, number = {11}, publisher = {JACoW Publishing, Geneva, Switzerland}, month = {12}, year = {2022}, issn = {2673-5350}, isbn = {978-3-95450-241-7}, doi = {10.18429/JACoW-IBIC2022-TUP25}, url = {https://jacow.org/ibic2022/papers/tup25.pdf}, abstract = {{The longitudinal charge profiles of the high intensity heavy ion beam accelerated at the GSI UNILAC upto 11.4 MeV/u can differ significantly in consecutive macro-pulses. Variations in bunch shape and mean energy were also observed within a single macro-pulse. In order to have an accurate and fast determination of bunch shape and its evolution within a macro-pulse, a study of fast Faraday Cup designs is underway at GSI. In this contribution, we present CST particle in cell (PIC) simulations of radially coupled co-axial Fast Faraday Cup (RCFFC) and conventional axially coupled FFC (ACFFC) design. The simulation results are compared to the measurements performed under comparable beam conditions primarily with RCFFCs. A rather large impact of secondary electron emission is observed in simulations and experiments. The biasing of the FFC central electrode as a mitigation mechanism on the measured profiles is discussed.}}, }