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@inproceedings{marqversen:ibic2022-tup30, author = {O. Marqversen and D. Alves}, title = {{Beam Intensity Measurement in ELENA Using Orbit Pick-Ups}}, & booktitle = {Proc. IBIC'22}, booktitle = {Proc. 11th Int. Beam Instrum. Conf. (IBIC'22)}, pages = {296--299}, eid = {TUP30}, language = {english}, keywords = {proton, simulation, feedback, antiproton, pick-up}, 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-TUP30}, url = {https://jacow.org/ibic2022/papers/tup30.pdf}, abstract = {{A bunched beam intensity measurement system for the CERN Extra Low ENergy Antiproton (ELENA) ring, using a cylindrical shoe-box electrostatic pick-up from the existing orbit system [1], is presented. The system has been developed to measure very challenging beam cur-rents, as low as 200nA corresponding to intensities of the order of 10⁷ antiprotons circulating with a relativistic beta of the order of 10-2. In this work we derive and show that the turn-by-turn beam intensity is proportional to the baseline of the sum signal and that, despite the AC-coupling of the system, the installed front-end electronics, based on a charge amplifier, not only guarantees the preservation of the bunch shape (up to a few tens of MHz), but also allows for an absolute calibration of the system. In addition, the linearity of the intensity measurements and their inde-pendence with respect to average beam position is evalu-ated using a standard electromagnetic simulation tool. Finally, experimental measurements throughout typical antiproton deceleration cycles are presented and their accuracy and precision are discussed.}}, }