Author: Pacey, T.H.
Paper Title Page
MOPAB151 A Stable Drive Beam for High Gradient Dielectric Wakefield Acceleration 528
 
  • T.J. Overton, Y.M. Saveliev, G.X. Xia
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • T.J. Overton, G.X. Xia
    The University of Manchester, Manchester, United Kingdom
  • T.H. Pacey, Y.M. Saveliev
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  
  Funding: Science and Technology Funding Council (STFC) student grant.
A high accelerating gradient, with stable beam transport, is necessary for the next generation of particle accelerators. Dielectric wakefield accelerators are a potential solution to this problem. In these proceedings, we present simulation studies of electron bunches in the self-wake regime inside a planar dielectric structure. This is analogous to driving beams in a dielectric wakefield accelerator. The transverse and longitudinal wake fields are investigated for dielectric plate gaps, various transverse beam sizes, and longitudinal bunch profiles. The effects of these on the stability of drive bunches, and acceleration of a witness bunch, are discussed in the context of electron bunches that can be produced with conventional linac RF technology. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB151  
About • paper received ※ 13 May 2021       paper accepted ※ 07 June 2021       issue date ※ 24 August 2021  
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TUPAB285 Broadband Imaging of Coherent Radiation as a Single-Shot Bunch Length Monitor with Femtosecond Resolution 2147
 
  • J. Wolfenden, R.B. Fiorito, E. Kukstas, C.P. Welsch
    The University of Liverpool, Liverpool, United Kingdom
  • M. Brandin, B.S. Kyle, E. Mansten, S. Thorin
    MAX IV Laboratory, Lund University, Lund, Sweden
  • R.B. Fiorito, C.P. Welsch, J. Wolfenden
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • E. Mansten
    Lund University, Division of Atomic Physics, Lund, Sweden
  • T.H. Pacey
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  
  Funding: This work is supported by the AWAKE-UK project funded by STFC and the STFC Cockcroft core grant No. ST/G008248/1
Bunch length measurements with femtosecond resolution are a key component in the optimisation of beam quality in FELs, storage rings, and plasma-based accelerators. This contribution presents the development of a novel single-shot bunch length monitor with femtosecond resolution, based on broadband imaging of the spatial distribution of emitted coherent radiation. The technique can be applied to many radiation sources; in this study the focus is coherent transition radiation (CTR) at the MAX IV Short Pulse Facility. Bunch lengths of interest at this facility are <100 fs FWHM; therefore the CTR is in the THz to Far-IR range. To this end, a THz imaging system has been developed, utilising high resistivity float zone silicon lenses and a pyroelectric camera; building upon previous results where single-shot compression monitoring was achieved. This contribution presents simulations of this new CTR imaging system to demonstrate the synchrotron radiation mitigation and imaging capability provided, alongside initial measurements and a bunch length fitting algorithm, capable of shot-to-shot operation. A new machine learning analysis method is also discussed. 		 
poster icon Poster TUPAB285 [2.008 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB285  
About • paper received ※ 17 May 2021       paper accepted ※ 24 June 2021       issue date ※ 23 August 2021  
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FRXC02
 Non Invasive Bunch Length Measurements Exploiting Cherenkov Diffraction Radiation  
 
  • S. Mazzoni, M. Bergamaschi, R. Corsini, A. Curcio, W. Farabolini, D. Gamba, L. Garolfi, A. Gilardi, R. Kieffer, M. Krupa, T. Lefèvre, E. Senes, M. Wendt
    CERN, Geneva, Switzerland
  • A. Curcio
    NSRC SOLARIS, Kraków, Poland
  • C. Davut, G.X. Xia
    UMAN, Manchester, United Kingdom
  • W. Farabolini
    CEA-DRF-IRFU, France
  • K.V. Fedorov, P. Karataev, K. Lekomtsev, C. Pakuza
    JAI, Oxford, United Kingdom
  • K.V. Fedorov, A. Potylitsyn
    TPU, Tomsk, Russia
  • J. Gardelle
    CEA, LE BARP cedex, France
  • P. Karataev
    Royal Holloway, University of London, Surrey, United Kingdom
  • T.H. Pacey, Y.M. Saveliev
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  • A. Schloegelhofer
    TU Vienna, Wien, Austria
  • E. Senes
    Oxford University, Physics Department, Oxford, Oxon, United Kingdom
  
  Cherenkov Diffraction Radiation (ChDR) refers to the emission of broadband electromagnetic radiation which occurs when a charged particle propagates at relativistic speed in the vicinity of a dielectric material. At variance with the better-known Cherenkov radiation, ChDR is a non-invasive technique, that is the particle beam does not impinge on the dielectric radiator. ChDR also possesses other interesting features like a relatively high light yield, a broadband spectrum of emission and the emission at a relatively large angle with respect to the beam trajectory. Due to its potential, CERN initiated over the last few years several studies on ChDR-based diagnostics techniques. In this contribution I will focus on the exploitation of ChDR for non-invasive bunch length measurement, from proof of principle tests performed at the CLEAR facility at CERN and CLARA at Daresbury laboratory to current developments for experiments and facilities such as AWAKE and FCC  
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