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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Z. Martí, G. Benedetti, U. Iriso, E. Morales
ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
A. Franchi
ESRF, Grenoble, France
Fast beam-based alignment (BBA) of BPMs and quadrupole magnets was evolved and demonstrated at ALBA*. A conventional BBA method makes a local bump, change quadrupole strength, and measure COD by the quadrupole, which is very time-consuming. However, the fast BBA using AC excitations of corrector magnets can quickly measure the displacement between a BPM and a quadrupole. In the case of ALBA, the BBA duration was reduced from 5 hours to 10 minutes. The accuracy was the same as the conventional BBA (~10 um). This fast BBA method will help the alignment of BPMs in 3rd and 4th generation light sources. *: Z. Marti et al., Phys. Rev. Accel. Beams 23, 012802 (2020)
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Performance of BPM Readout Electronic Based on Pilot-Tone Generator and a Modified Libera Spark at ALBA
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L. Torino, U. Iriso
ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
As many synchrotron radiation sources, ALBA is also going through an upgrade project. At the same time, the world of BPM electronic is evolving fast to keep up with the stringent requirement of new facilities. In order to follow the situation closely and develop know-how for the future, we decided to install and test in our storage ring a BPM readout system composed by a Pilot-Tone generator (developed by Elettra) and a modified Libera Spark (by Instrumentation Technologies). We compare position measurement results and stability with the ones obtained by our standard Libera Brilliance and a Libera Brilliance+ electronics.
Analysis of Multi-Bunch Instabilities at Alba Using a Transverse Feedback System
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U. Iriso, T.F. Günzel
ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
Since 2015 Alba is equipped with a transverse bunch by bunch feedback system, which not only damps the transverse coupled bunch instabilities in the machine, but also allows the impedance characterization of the storage ring. This characterization is produced by an internal sequence, which is programmed to excite and measure the growth and damping rates of each of the multi-bunch modes. This paper describes the measurement technique, presents the studies carried out to characterize the machine and different movable systems like the scrapers or in-vacuum undulators. Results are compared with the transverse impedance spectra obtained from computer simulations.
Two-Dimensional Beam Size Measurements with X-Ray Heterodyne Near Field Speckles
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M. Siano, L. Teruzzi
Università degli Studi di Milano, Milano, Italy
D. Butti, A. Goetz, T. Lefèvre, S. Mazzoni, G. Trad
CERN, Meyrin, Switzerland
U. Iriso, A.A. Nosych, E. Solano, L. Torino
ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
B. Paroli, M.A.C. Potenza
Universita’ degli Studi di Milano & INFN, Milano, Italy
We report on 2D beam size measurements with a novel interferometric technique named Heterodyne Near Field Speckles, capable of resolving few-micrometer beam sizes. It relies on the interference between the weak spherical waves scattered by a colloidal suspension and the intense transilluminating X-ray beam. Fourier analysis of the resulting speckles enables full 2D coherence mapping of the incoming radiation, from which the beam sizes along the two orthogonal directions are retrieved. We show experimental results obtained with 12.4 keV X-rays at the NCD-SWEET undulator beamline at ALBA, where the vertical beam size has been changed between 5 and 15 micrometers by varying the beam coupling. The results agree well with the estimated beam sizes from the pinhole calculations. Finally, we discuss recent investigations on alternative targets aimed at improving the signal-to-noise ratio of the technique.
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Real-Time Beam Detection and Tracking From Pinhole Imaging System Based on Machine Learning
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A.A. Nosych, U. Iriso
ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
At ALBA Synchrotron each of the two in-air pinhole imaging systems is able to see several beam spots at once due to specific pinhole grid with 3x3 holes placed in the path of the X-ray fan. Each beam image has its own properties, such as source pinhole aperture size, its Point Spread Function (PSF) and copper filter thickness, all of which impact the electron beam size calculation. Until now, these parameters were applied manually to the pinhole device servers for numerical image analysis, so this semi-manual beam size calculator is subject to frequent adjustments and human monitoring. This study looks at feasibility of training and pointing an Artificial Neural Network (ANN) at image stream coming from pinhole cameras in real time, track all detected beam spots and analyze them, with the end goal to automate the whole pinhole beam image processing.
