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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Tests of the New BPM Long Term Drift Stabilization Scheme Based on External Crossbar Switching at PETRA III
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G. Kube, F. Schmidt-Föhre, K. Wittenburg
DESY, Hamburg, Germany
A. Bardorfer, L. Bogataj, M. Cargnelutti, P. Leban, P. Paglovec, B. Repič
I-Tech, Solkan, Slovenia
The PETRA IV project at DESY aims to upgrade the present synchrotron radiation source PETRA III at DESY into an ultralow-emittance source which will be diffraction limited up to X-rays of about 10 keV. Using a multi bend achromat lattice, the small PETRA beam emittance translates directly into much smaller beam sizes at the insertion device source points, thus imposing stringent requirements on machine stability. In order to measure beam positions and control orbit stability to the requisite level of accuracy, a high resolution BPM system will be installed which consists of about 700 individual monitors with the readout electronics based on MTCA.4 as technical platform. In order to fulfill the requested long-term drift requirement to be less than 1 micron over a period of seven days, due to the PETRA-specific machine geometry the BPM cable paths have to be stabilized in addition. To achieve this demand, the well proven concept of crossbar switching was extended such that the analogue switching part is separated from the read-out electronics and brought as close as possible to the BPM pickup. This contribution summarizes first proof-of-principle measurements which were performed in the lab and at PETRA III using a modified Libera Brilliance+ with external switching matrix. These measurements indicate that the concept of external switching works well and that the performance of this modified test setup fulfills the specifications.
Comparison of Two Long Term Drift Stabilization Schemes for BPM Systems
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F. Schmidt-Föhre, G. Kube, K. Wittenburg
DESY, Hamburg, Germany
For the planned upgrade of synchrotron radiation sources PETRA (called PETRA IV) at DESY a much higher beam brilliance is requested. In order to measure according beam positions and to control orbit stability to the corresponding level of accuracy, a future high-resolution BPM system has to deliver the necessary requirements on machine stability. This needs to enable long-term drift requirements of even less than 1 micron beam position deviation per week. Such a specification goal requires an additional long-term drift stabilization of the beam position monitor (BPM) readout scheme for PETRA IV, which will include a compensation of BPM cable parameter drifts. This paper discusses a comparison of two common compensation schemes using different signal conditioning features, typically needed at machine topologies with long BPM cable paths. Certain critical aspects of the different schemes are discussed in this report, while existing successful measurements are referred in some references.
