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The HL-LHC Beam Gas Vertex Monitor - Performance and Design Optimisation Using Simulations
/ Kolbinger, Bernadette (CERN) ; Gibson, Stephen M (Royal Holloway, U. of London) ; Guerin, Helene (CERN ; Royal Holloway, U. of London) ; Jones, Owain Rhodri (CERN) ; Kieffer, Robert (Royal Holloway, U. of London) ; Lefèvre, Thibaut (CERN) ; Salzburger, Andreas (CERN) ; Storey, James W (CERN) ; Veness, Raymond (CERN) ; Zamantzas, Christos (CERN)
The Beam Gas Vertex (BGV) instrument is a novel non-invasive beam profile monitor and part of the High Luminosity Upgrade of the Large Hadron Collider (LHC) at CERN. Its aim is to continuously measure emittance and transverse beam profile throughout the whole LHC cycle, which has not yet been achieved by any other single device in the machine. [...]
JACoW, 2021 - 5 p.
- Published in : JACoW IBIC 2021 (2021) 249-253
Fulltext: PDF;
In : 10th International Beam Instrumentation Conference (IBIC 2021), Online, Korea, 13 - 17 Sep 2021, pp.249-253
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2.
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The HL-LHC Beam Gas Vertex Monitor - Simulations for Design Optimisation and Performance Study
/ Guerin, Helene (CERN ; Royal Holloway, U. of London) ; Gibson, Stephen M (Royal Holloway, U. of London) ; Jones, Owain Rhodri (CERN) ; Kieffer, Robert (Royal Holloway, U. of London) ; Kolbinger, Bernadette (CERN) ; Lefèvre, Thibaut (CERN) ; Salvant, Benoit (CERN) ; Storey, James W (CERN) ; Veness, Raymond (CERN) ; Zamantzas, Christos (CERN)
The Beam Gas Vertex (BGV) instrument is a non-invasive transverse beam profile monitor being designed as part of the High Luminosity Upgrade of the LHC (HL-LHC) at CERN. Its aim is to continuously measure bunch-by-bunch beam profiles, independent of beam intensity, throughout the LHC cycle. [...]
Geneva : JACoW, 2021 - 4 p.
- Published in : JACoW IPAC 2021 (2021) 2120-2123
Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.2120-2123
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3.
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Properties of Cherenkov Diffraction Radiation as Predicted by the Polarisation Currents Approach for Beam Instrumentation
/ Harryman, Daniel (Royal Holloway, U. of London) ; Bergamaschi, Michele (CERN) ; Bobb, Lorraine (Garsington, Oxfordshire) ; Fedorov, Kirill (Royal Holloway, U. of London) ; Karataev, Pavel (Royal Holloway, U. of London) ; Kieffer, Robert (CERN) ; Łasocha, Kacper (CERN) ; Lefèvre, Thibaut (CERN) ; Mazzoni, Stefano (CERN) ; Potylitsyn, Alexander (Tomsk Polytechnic U.) et al.
Cherenkov-Diffraction Radiation (ChDR) appears when a charged particle moves in the vicinity of a dielectric medium with velocity higher than the phase velocity of light inside the medium. As the charged particle does not contact the medium, the emission of ChDR is a phenomenon that can be exploited for a range of non-invasive beam diagnostics. [...]
2020 - 5 p.
- Published in : 10.18429/JACoW-IBIC2020-THPP05
Fulltext: PDF;
In : 9th International Beam Instrumentation Conference, Online, 14 - 18 Sep 2020, pp.THPP05
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4.
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Cherenkov Diffraction Radiation as a tool for beam diagnostics
/ Lefèvre, Thibaut (CERN) ; Alves, Diogo (CERN) ; Apollonio, Marco (Diamond Light Source) ; Aryshev, Alexander (KEK, Tsukuba) ; Bergamaschi, Michele (CERN) ; Billing, Michael (Cornell U., CLASSE) ; Bleko, Vitol'd (Tomsk Polytechnic U.) ; Bobb, Lorraine (Diamond Light Source) ; Bordlemay Padilla, Yadira (Cornell U., CLASSE) ; Conway, Joseph (Cornell U., CLASSE) et al.
During the last three years, the emission of Cherenkov Diffraction Radiation (ChDR), appearing when a relativistic charged particle moves in the vicinity of a dielectric medium, has been investigated with the aim of providing non-invasive beam diagnostics. ChDR has very interesting properties, with a large number of photons emitted in a narrow and well-defined solid angle, providing excellent conditions for detection with very little background. [...]
2019 - 5 p.
- Published in : 10.18429/JACoW-IBIC2019-THAO01
Fulltext: PDF;
In : 8th International Beam Instrumentation Conference (IBIC 2019), Malmo, Sweden, 8 - 12 Sep 2019
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5.
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First Measurements of Cherenkov-Diffraction Radiation at Diamond Light Source
/ Harryman, Daniel (JAI, UK) ; Apollonio, Marco (Diamond Light Source) ; Bergamaschi, Michele (CERN) ; Bobb, Lorraine (Diamond Light Source) ; Karataev, Pavel (JAI, UK) ; Kieffer, Robert (CERN) ; Krupa, Michal (CERN) ; Lefèvre, Thibaut (CERN) ; Mazzoni, Stefano (CERN) ; Potylitsyn, Alexander (Tomsk Polytechnic U.)
Cherenkov Diffraction Radiation (ChDR), appearing when a charged particle moves in the vicinity of a dielectric medium with speed faster than the speed of light inside the medium, is a phenomenon that can be exploited for a range of non-invasive beam diagnostics. By using dielectric radiators that emit photons when in proximity to charged particle beams, one can design devices to measure beam properties such as position, direction and size. [...]
2019 - 5 p.
- Published in : 10.18429/JACoW-IBIC2019-WEPP037
Fulltext: PDF;
In : 8th International Beam Instrumentation Conference (IBIC 2019), Malmo, Sweden, 8 - 12 Sep 2019, pp.WEPP037
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6.
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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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7.
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Diffractive shadowing of coherent polarization radiation
/ Curcio, A (CERN) ; Bergamaschi, M (CERN) ; Corsini, R (CERN) ; Gamba, D ; Farabolini, W (CERN) ; Kieffer, R (CERN) ; Lefevre, T (CERN) ; Mazzoni, S (CERN) ; Dolci, V (U. Rome La Sapienza (main) ; INFN, Rome) ; Petrarca, M (U. Rome La Sapienza (main) ; INFN, Rome) et al.
We report on the study of shadowing of electromagnetic fields radiated in the Terahertz (THz) region from two consecutive sources of coherent diffraction and transition radiation. In these conditions, the formation length is predicted to be $\leq$ 100 m, and shadowing effects should result in an almost complete suppression of radiated fields within distances of the order of tens of centimeters. [...]
2021
- Published in : Phys. Lett. A 391 (2021) 127135
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8.
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Generation of incoherent Cherenkov diffraction radiation in synchrotrons
/ Kieffer, R (CERN) ; Bartnik, L (Cornell U.) ; Bergamaschi, M (CERN) ; Bleko, V V (Dubna, JINR) ; Billing, M (Cornell U.) ; Bobb, L (Diamond Light Source) ; Conway, J (Cornell U.) ; Forster, M (Cornell U.) ; Karataev, P (Royal Holloway, U. of London) ; Konkov, A S (Dubna, JINR) et al.
Incoherent Cherenkov diffraction radiation was recently produced in the Cornell electron storage ring using counterpropagating beams (electrons and positrons) passing in the close vicinity of a dielectric made of fused silica. We present in this paper a collection of the experimental investigations that were performed on Cherenkov diffraction radiation in both the infrared and the visible range. [...]
2020 - 9 p.
- Published in : Phys. Rev. Accel. Beams 23 (2020) 042803
Fulltext from Publisher: PDF;
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9.
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Recent Results on Non-invasive Beam Size Measurement Methods Based on Polarization Currents
/ Mazzoni, Stefano (CERN) ; Aryshev, Alexander (KEK, Tsukuba) ; Bergamaschi, Michele (CERN) ; Billing, Michael (Cornell U.) ; Bleko, Vitol'd (Tomsk Polytechnic U.) ; Bobb, Lorraine (Diamond Light Source) ; Conway, Joseph (Cornell U.) ; Forster, Michael (Cornell U.) ; Fuentes, Yadira (Cornell U.) ; Jones, Owain Rhodri (CERN) et al.
We present recent results on non-invasive beam profile measurement techniques based on Diffraction Radiation (DR) and Cherenkov Diffraction Radiation (ChDR). Both methods exploit the analysis of broadband electromagnetic radiation resulting from polarization currents produced in, or at the boundary of, a medium in close proximity of a charged particle beam. [...]
JACoW, 2019 - 4 p.
- Published in : 10.18429/JACoW-IBIC2018-WEPB14
Published fulltext: PDF;
In : 7th International Beam Instrumentation Conference, Shanghai, China, 9 - 13 Sep, 2018, pp.WEPB14
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10.
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Noninvasive bunch length measurements exploiting Cherenkov diffraction radiation
/ Curcio, A (CERN) ; Bergamaschi, M (CERN) ; Corsini, R (CERN) ; Farabolini, W (CERN) ; Gamba, D (CERN) ; Garolfi, L (CERN) ; Kieffer, R (CERN) ; Lefevre, T (CERN) ; Mazzoni, S (CERN) ; Fedorov, K (JAI, UK ; Tomsk Polytechnic U.) et al.
We present the observation and the detailed investigation of coherent Cherenkov diffraction radiation (CChDR) in terms of spectral-angular characteristics. Electromagnetic simulations have been performed to optimize the design of a prismatic dielectric radiator and the performance of a detection system with the aim of providing longitudinal beam diagnostics. [...]
2020 - 13 p.
- Published in : Phys. Rev. Accel. Beams 23 (2020) 022802
Fulltext: PDF;
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