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1.
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Driver-witness configuration in CNT array-based acceleration
/ Barbera Ramos, Moises (Valencia U.) ; Bonatto, Alexandre (Rio Grande do Sul U.) ; Bontoiu, Cristian (Cockcroft Inst. Accel. Sci. Tech. ; Liverpool U.) ; Xia, Guoxing (Cockcroft Inst. Accel. Sci. Tech. ; Manchester U.) ; Resta-Lopez, Javier (Valencia U.) ; Apsimon, Oznur (Cockcroft Inst. Accel. Sci. Tech. ; Manchester U.) ; Martín-Luna, Pablo (Valencia U., IFIC) ; Rodin, Volodymyr (CERN)
Solid-state plasma wakefield acceleration might be an alternative to accelerate particles with ultra-high accelerating gradients, in the order of TV/m.In addition, due to their thermodynamic properties, 2D carbon-based materials, such as graphene layers and/or carbon nanotubes (CNT) are good candidates to be used as the media to sustain such ultra-high gradients. In particular, due to their cylindrical symmetry, multi-nm-aperture targets, made of CNT bundles or arrays may facilitate particle channelling through the crystalline structure.In this work, a two-bunch, driver-and-witness configuration is proposed to demonstrate the potential to achieve particle acceleration as the bunches propagate along a CNT-array structure.Particle-in-cell simulations have been performed using the VSIM code in a 2D Cartesian geometry to study the acceleration of the second (witness) bunch caused by the wakefield driven by the first (driver) bunch.The effective plasma-density approach was adopted to estimate the wakefield wavelength, which was used to identify the ideal separation between the two bunches, aiming to optimize the witness-bunch acceleration and focusing.Simulation results show the high acceleration gradient obtained, and the energy transfer from the driver to the witness bunch..
2023 - 4 p.
- Published in : JACoW IPAC 2023 (2023) TUPA052
Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.TUPA052
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2.
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3.
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Optimization Study of Beam Position and Angular Jitter Independent Bunch Length Monitor for Awake Run 2
/ Davut, Can (U. Manchester (main) ; Cockcroft Inst. Accel. Sci. Tech. ; CERN) ; Apsimon, Oznur (U. Liverpool (main) ; Cockcroft Inst. Accel. Sci. Tech.) ; Karataev, Pavel (Royal Holloway, U. of London) ; Lefèvre, Thibaut (CERN) ; Mazzoni, Stefano (CERN) ; Xia, Guoxing (U. Manchester (main) ; Cockcroft Inst. Accel. Sci. Tech.)
In this paper, a study using the Polarization Current Approach (PCA) model is performed to optimize the design of a short bunch length monitor using two dielectric radiators that produce coherent Cherenkov Diffraction Radiation (ChDR). The electromagnetic power emitted from each radiator is measuring a different part of the bunch spectrum using Schottky diodes. [...]
2022 - 4 p.
- Published in : JACoW IBIC 2022 (2022) 465-468
Fulltext: PDF;
In : 11th International Beam Instrumentation Conference (IBIC 2022), Cracow, Poland, 11 - 15 Sep 2022, pp.465-468
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4.
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First Interaction Region Local Coupling Corrections in the LHC Run 3
/ Soubelet, Felix (CERN ; Liverpool U.) ; Apsimon, Oznur (Liverpool U.) ; Persson, Tobias (CERN) ; Tomás García, Rogelio (CERN) ; Welsch, Carsten (Liverpool U.)
The successful operation of large scale particle accelerators depends on the precise correction of unavoidable magnetic field or magnet alignment errors present in the machine. During the LHC Run 2, local linear coupling in the interaction regions (IR) was shown to have a significant impact on the beam size, making its proper handling a necessity for Run 3 and the High Luminosity LHC (HL-LHC). [...]
2022 - 4 p.
- Published in : JACoW IPAC 2022 (2022) 1838-1841
Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.1838-1841
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5.
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Application of Nanostructures and Metamaterials in Accelerator Physics
/ Resta-López, Javier (GACE-ICMUV) ; Apsimon, Oznur (Liverpool U.) ; Bonatto, Alexandre (Rio Grande do Sul U.) ; Bonțoiu, Cristian (Liverpool U.) ; Galante, Bruno (CERN) ; Welsch, Carsten (Liverpool U. ; Cockcroft Inst. Accel. Sci. Tech.) ; Xia, Guoxing (U. Manchester (main))
Carbon-based nanostructures and metamaterials offer extraordinary mechanical and opto-electrical properties, which make them suitable for applications in diverse fields, including, for example, bioscience, energy technology and quantum computing. In the latest years, important R&D; efforts have been made to investigate the potential use of graphene and carbon-nanotube (CNT) based structures to manipulate and accelerate particle beams. [...]
2022 - 4 p.
- Published in : JACoW IPAC 2022 (2022) 659-662
Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.659-662
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6.
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Supervised Machine Learning for Local Coupling Sources Detection in the LHC
/ Soubelet, Felix (CERN ; U. Liverpool (main)) ; Apsimon, Oznur (U. Liverpool (main)) ; Persson, Tobias (CERN) ; Tomás García, Rogelio (CERN) ; Welsch, Carsten (U. Liverpool (main))
Local interaction region (IR) linear coupling in the LHC has been shown to have a negative impact on beam size and luminosity, making its accurate correction for Run 3 and beyond a necessity. In view of determining corrections, supervised machine learning has been applied to the detection of linear coupling sources, showing promising results in simulations. [...]
2022 - 4 p.
- Published in : JACoW IPAC 2022 (2022) 1842-1845
Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.1842-1845
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7.
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Carbon Nanotubes as Cold Electron Field Emitters for Electron Cooling in the CERN Extra Low Energy Antiproton (ELENA) Ring
/ Galante, Bruno (CERN ; Cockcroft Inst. Accel. Sci. Tech. ; Liverpool U.) ; Apsimon, Oznur (Liverpool U. ; Cockcroft Inst. Accel. Sci. Tech.) ; Resta-López, Javier (GACE-ICMUV) ; Tranquille, Gerard A (CERN) ; Welsch, Carsten P (Liverpool U. ; Cockcroft Inst. Accel. Sci. Tech.)
In ELENA electron cooling reduces the emittance of the antiproton beam allowing to deliver a high-quality beam to the experiments at the unprecedented low energy of 100 keV. To cool the antiproton beam at this low energy, the electron gun must emit electrons with as monoenergetic a distribution as possible. [...]
Geneva : JACoW, 2021 - 4 p.
- Published in : JACoW IPAC 2021 (2021) 2975-2978
Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.2975-2978
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The AWAKE Run 2 programme and beyond
/ AWAKE Collaboration
Plasma wakefield acceleration is a promising technology to reduce the size of particle accelerators. Use of high energy protons to drive wakefields in plasma has been demonstrated during Run 1 of the AWAKE programme at CERN. [...]
arXiv:2206.06040.-
2022-08-12 - 21 p.
- Published in : Symmetry 14 (2022) 1680
Fulltext: document - PDF; 2206.06040 - PDF;
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Analytical and Numerical Characterization of Cherenkov Diffraction Radiation as a Longitudinal Electron Bunch Profile Monitor for AWAKE Run 2
/ Davut, Can (Manchester U. ; Cockcroft Inst. Accel. Sci. Tech.) ; Apsimon, Oznur (Liverpool U. ; Cockcroft Inst. Accel. Sci. Tech.) ; Karataev, Pavel (Royal Holloway, U. of London) ; Lefèvre, Thibaut (CERN) ; Mazzoni, Stefano (CERN) ; Xia, Guoxing (Manchester U. ; Cockcroft Inst. Accel. Sci. Tech.)
In this paper, CST simulations of the coherent Cherenkov Diffraction Radiation with a range of parameters for different dielectric target materials and geometries are discussed and compared with the theoretical investigation of the Polarization Current Approach to design a prototype of a radiator for the bunch length/profile monitor for AWAKE Run 2. It was found that the result of PCA theory and CST simulation are consistent with each other regarding the shape of the emitted ChDR cone..
Geneva : JACoW, 2021 - 4 p.
- Published in : JACoW IPAC 2021 (2021) 4355-4358
Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.4355-4358
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10.
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Prospect for Interaction Region Local Coupling Correction in the LHC Run 3
/ Soubelet, Felix (CERN ; Liverpool U.) ; Apsimon, Oznur (Liverpool U.) ; Persson, Tobias (CERN) ; Tomás García, Rogelio (CERN) ; Welsch, Carsten (Liverpool U.)
Successful operation of large scale particle accelerators depends on the precise correction of unavoidable magnet field or alignment errors present in the machine. In the LHC Run 2, local linear coupling in the Interaction Regions (IR) has been proven to have a severe impact on beam size and hence the luminosity - up to a 50% decrease -, making its handling a target for Run 3 and High Luminosity LHC (HL-LHC). [...]
JACoW, 2021 - 4 p.
- Published in : JACoW IPAC 2021 (2021) MOPAB007
Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.MOPAB007
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