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Gas jet-based beam profile monitor for the electron beam test stand at CERN
/ Stringer, O (Liverpool U. ; Cockcroft Inst. Accel. Sci. Tech.) ; Zhang, H (Liverpool U. ; Cockcroft Inst. Accel. Sci. Tech.) ; Ady, M (CERN) ; Butti, D (CERN) ; Churchman, A R (CERN) ; Forck, P (Darmstadt, GSI) ; Kumar, N (Liverpool U. ; Cockcroft Inst. Accel. Sci. Tech.) ; Lefevre, T (CERN) ; Mazzoni, S (CERN) ; Sameed, M (CERN) et al.
A non-invasive bidirectional beam profile monitor using beam-induced fluorescence upon a thin sheet of gas has been developed at the Cockcroft Institute in collaboration with CERN and GSI. This device is particularly suited to the Electron Beam Test Stand, and as such, a bespoke gas injection has been optimized for this specific use-case to provide diagnostics unavailable to conventional scintillator screens. [...]
2024 - 4 p.
- Published in : JACoW IPAC 2024 (2024) WEPG18
Fulltext: PDF;
In : 15th International Particle Accelerator Conference (IPAC 2024), Nashville, TN, United States, 19 - 24 May 2024, pp.WEPG18
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2.
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FOCUS: fast Monte Carlo approach to coherence of undulator sources
/ Siano, M (Milan U. ; INFN, Milan) ; Geloni, G (European XFEL, Hamburg) ; Paroli, B (Milan U. ; INFN, Milan) ; Butti, D (CERN) ; Lefèvre, T (CERN) ; Mazzoni, S (CERN) ; Trad, G (CERN) ; Iriso, U (CELLS - ALBA, LLS) ; Nosych, A A (CELLS - ALBA, LLS) ; Torino, L (CELLS - ALBA, LLS) et al.
FOCUS (Fast Monte CarlO approach to Coherence of Undulator Sources) is a new GPU-based simulation code to compute the transverse coherence of undulator radiation from ultra-relativistic electrons. The core structure of the code, which is written in the language C++ accelerated with CUDA, combines an analytical description of the emitted electric fields and massively parallel computations on GPUs. [...]
2023 - 10 p.
- Published in : J. Synchrotron Radiat. 30 (2023) 217-226
Fulltext: PDF;
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3.
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CERN’s beam instrumentation R&D; study for FCC-ee
/ Mazzoni, S (CERN) ; Schloegelhofer, A (CERN ; Vienna U.) ; Nosych, A A (CELLS - ALBA, LLS) ; Muller, A -S (KIT, Karlsruhe) ; Haerer, B (KIT, Karlsruhe) ; Paroli, B (Milan U.) ; Butti, D (CERN) ; Howling, E (CERN ; Oxford U.) ; Trad, G (CERN) ; Niehues, G (KIT, Karlsruhe) et al.
The Future Circular Collider (FCC) R&D; study was started in 2021 as a comprehensive feasibility analysis of CERN’s future accelerator project encompassing technical, administrative and financial aspects. As part of the study, Beam Instrumentation (BI) is a key technical infrastructure that will have to face unprecedented challenges. [...]
2023 - 4 p.
- Published in : JACoW IPAC 2023 (2023) THPL088
Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.THPL088
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4.
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FOCUS: Fast Monte-CarlO Approach to Coherence of Undulator Sources
/ Siano, Mirko (U. Milan (main)) ; Butti, Daniele (CERN) ; Geloni, Gianluca (European XFEL, Hamburg) ; Iriso, Ubaldo (CELLS - ALBA, LLS) ; Lefèvre, Thibaut (CERN) ; Mazzoni, Stefano (CERN) ; Nosych, Andriy (CELLS - ALBA, LLS) ; Paroli, Bruno (U. Milan (main)) ; Potenza, Marco (U. Milan (main)) ; Torino, Laura (CELLS - ALBA, LLS) et al.
We present Fast Monte-CarlO approach to Coherence of Undulator Sources (FOCUS), a new GPU-based code to compute the transverse coherence of X-ray radiation from undulator sources. The code relies on scaled dimension- less quantities and analytic expressions of the electric field emitted by electrons in an undulator. [...]
2022 - 4 p.
- Published in : JACoW IBIC 2022 (2022) 257-260
Fulltext: PDF;
In : 11th International Beam Instrumentation Conference (IBIC 2022), Cracow, Poland, 11 - 15 Sep 2022, pp.257-260
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5.
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Recent LHC SR Interferometer Simulations and Experimental Results
/ Butti, Daniele (CERN ; Royal Holloway, U. of London) ; Bravin, Enrico (CERN) ; Gibson, Stephen (Royal Holloway, U. of London) ; Trad, Georges (CERN)
At the CERN Large Hadron Collider (LHC), among the different systems exploiting Synchrotron Radiation (SR) for beam diagnostics, interferometry is under study as a non-invasive technique for measuring absolute beam transverse sizes. Extensive numerical simulations, recently completed for characterising the spatial coherence of the LHC SR source, facilitated the optimisation of the LHC interferometer design and the existing prototype system tested in the past has been refurbished to include the new simulation findings. [...]
2022 - 4 p.
- Published in : JACoW IBIC 2022 (2022) 88-91
Fulltext: PDF;
In : 11th International Beam Instrumentation Conference (IBIC 2022), Cracow, Poland, 11 - 15 Sep 2022, pp.88-91
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6.
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Two-Dimensional Beam Size Measurements with X-Ray Heterodyne Near Field Speckles
/ Siano, Mirko (Milan U.) ; Butti, Daniele (CERN) ; Goetz, Alexander (CERN) ; Iriso, Ubaldo (CELLS - ALBA, LLS) ; Lefèvre, Thibaut (CERN) ; Mazzoni, Stefano (CERN) ; Nosych, Andriy A (CELLS - ALBA, LLS) ; Paroli, Bruno (Milan U.) ; Potenza, Marco A C (Milan U.) ; Solano, Eduardo (CELLS - ALBA, LLS) et al.
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. [...]
JACoW, 2021 - 4 p.
- Published in : JACoW IBIC 2021 (2021) 176-179
Fulltext: PDF;
In : 10th International Beam Instrumentation Conference (IBIC 2021), Online, Korea, 13 - 17 Sep 2021, pp.176-179
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7.
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Two-dimensional electron beam size measurements with x-ray heterodyne near field speckles
/ Siano, M (Milan U. ; INFN, Milan) ; Paroli, B (Milan U. ; INFN, Milan) ; Potenza, M A C (Milan U. ; INFN, Milan) ; Teruzzi, L (Milan U. ; INFN, Milan) ; Iriso, U (CELLS - ALBA, LLS) ; Nosych, A A (CELLS - ALBA, LLS) ; Solano, E (CELLS - ALBA, LLS) ; Torino, L (CELLS - ALBA, LLS) ; Butti, D (CERN) ; Goetz, A (CERN) et al.
In this paper we report on recent two-dimensional (2D) electron beam size measurements with a nonconventional synchrotron radiation interferometric technique based on x-ray heterodyne near field speckles (HNFS). The method relies on Fourier analysis of the random speckle patterns generated by a water suspension of nanospheres to assess the full 2D transverse coherence of the incoming x rays. [...]
2022 - 12 p.
- Published in : Phys. Rev. Accel. Beams 25 (2022) 052801
Fulltext: PDF;
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8.
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Simulation Methods for Transverse Beam Size Measurements Using the Heterodyne Near Field Speckles of Hard X-rays
/ Goetz, Alexander (CERN) ; Butti, Daniele (CERN) ; Iriso, Ubaldo (CELLS - ALBA, LLS) ; Mazzoni, Stefano (CERN) ; Nosych, Andriy (CELLS - ALBA, LLS) ; Paroli, Bruno (Milan U.) ; Potenza, Marco (INFN, Milan ; Milan U.) ; Siano, Mirko (Milan U.) ; Teruzzi, Luca (Milan U.) ; Torino, Laura (CELLS - ALBA, LLS) et al.
The Heterodyne Near Field Speckles (HNFS) is a special type of interferometry technique where radiation is scattered by nanoparticles suspended in a medium. The scattered waves and the transmitted radiation form an interference pattern, which is modulated by the spatial coherence of the radiation and by the scattering properties of the nanoparticles. [...]
2020 - 4 p.
- Published in : 10.18429/JACoW-IBIC2020-THPP33
Fulltext: PDF;
In : 9th International Beam Instrumentation Conference, Online, 14 - 18 Sep 2020, pp.THPP33
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LHC Emittance Measurements in Run 2
/ Trad, G (CERN) ; Alexopoulos, A (CERN) ; Bravin, E (CERN) ; Butti, D (CERN) ; Kieffer, R (CERN) ; Roncarolo, F (CERN) ; Vlachos, S (CERN) ; Wurkner, B (CERN)
Measuring the beam transverse emittance is fundamental in every accelerator, in
particular for the LHC, where its precise determination and its preservation is
essential to maximize the luminosity and thus the performance of the colliding
beams. In this contribution, a review of the status of the wirescanners, the
synchrotron radiation monitors, the beam gas vertex detector and the quadrupolar
moment measurement from the beam position monitors will be presented alongside
the assessment of the obtained performance. [...]
Geneva, Switzerland : , 2019 - 7 p.
- Published in : , pp. 117-123
Fulltext: PDF;
In : 9th LHC Operations Evian Workshop, Evian Les Bains, France, 30 Jan - 1 Feb 2019, pp.117-123
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