Summary of the ARIES Workshop on Materials and Engineering Technologies for Particle Accelerator Beam Diagnostic Instruments
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P. Forck
GSI, Darmstadt, Germany
D. Eakins
University of Oxford, Oxford, United Kingdom
U. Iriso
ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
O.R. Jones, R. Veness
CERN, Meyrin, Switzerland
G. Kube, K. Wittenburg
DESY, Hamburg, Germany
V. Schlott
PSI, Villigen PSI, Switzerland
Funding:This project has received funding from the European Union’s Horizon 2020 Research and Innovation programme under Grant Agreement No 730871. ARIES* is an EU-sponsored programme for accelerator research and innovation. An international Workshop was held online as part of this programme in June 2021 on the topic of ’Materials and Engineering Technologies for Particle Accelerator Beam Diagnostic Instruments’. The aim of the Workshop was to bring together instrument designers, experts and industry and research groups to review the state of the art in the field, present designs and discuss future challenges, whilst also developing and strengthening collaborations between groups. There were sessions covering ’Instrument design and operation’, ’Novel materials and applications’ and ’New technology and components’ over the three half-days of the on-line meeting. This paper will review the key topics presented at the workshop along with a summary of discussions held and proposed directions for future studies. * https://aries.web.cern.ch
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Comparison of Feschenko BSM and Fast Faraday Cup with Low Energy Ion Beams
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R. Singh, W.A. Barth, P. Forck, S. Lauber, M. Miski-Oglu, T. Reichert, T. Sieber
GSI, Darmstadt, Germany
V.E. Scarpine, D. Sun
Fermilab, Batavia, Illinois, USA
A comparison between Fast Faraday Cup and Feschenko longitudinal bunch shape detectors was recently performed at HELIAC Advanced Demonstrator beamline at GSI. Feschenko bunch shape monitor (BSM) uses the time to space conversion by means of secondary electrons emitted from a wire correlated to a rf deflector, while the fast Faraday cup (FFC) measures the deposited charge in a cup geometry matched to 50 Ohm. The FFC design aims to minimize the bunch shape dilution due to field polarization and secondary electrons produced on irradiation. An He1+ with 100 µA average current and 1.4 MeV/u kinetic energy is utilized for this comparison. A buncher upstream of the detectors was operated to focus the beam longitudinally. The results are discussed in this contribution.
Sub-ns Single-Particle Spill Characterization for Slow Extraction
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T. Milosic, P. Forck, R. Singh
GSI, Darmstadt, Germany
With the recent developments on improving spill quality at GSI/FAIR, appropriate measurement devices have come into focus again. In contrast to commonly used scaler-based approaches where events at a certain sample frequency are counted, we present a measurement concept resolving single event detector timestamps in the sub-ns regime leveraging a well established off-the-shelf TDC VMEbus module. This allows for high resolution time structure information with respect to the ring RF as well as valuation of inter-particle separation distributions. This yields insightful information for specific experiments at GSI whose efficiencies are heavily limited by pile-ups and detector dead times. We will present the concept of the measurement setup and exemplary data taken in recent campaigns in context of spill microstructure improvements for slow extraction.
