Author: Middleman, K.J.
Paper Title Page
MOPRI047 The Preparation of Atomically Clean Metal Surfaces for use as Photocathodes in Normally Conducting RF Guns 711
 
  • T.C.Q. Noakes, A.N. Hannah, K.J. Middleman, B.L. Militsyn, R. Valizadeh
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  • S. Mistry
    Loughborough University, Leicestershre, United Kingdom
 
  Funding: Research supported by FP7 EuCard2 http://cern.ch/eucard2
This work reports a study of various alternative metal samples as candidate materials for use as photocathodes in normally conducting RF guns. Clean surfaces were prepared using Argon ion bombardment and quantum efficiency measured using a 265 nm UV LED light source with a picoammeter for drain current monitoring. Surface composition was studied using X-ray photoelectron spectroscopy and a Kelvin probe apparatus provided work function measurements. Data was taken both before and after annealing to 200°C, a temperature that is routinely achieved during RF gun vacuum baking. Ion bombardment typically leaves a very rough surface that can have a detrimental effect on beam emittance, so further work will focus on the use of Oxygen plasma cleaning of the best candidate alternative metals. An oxygen plasma treated Copper photocathode has been shown to produce an acceptable level of quantum efficiency in the VELA accelerator at Daresbury Laboratory.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRI047  
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WEPME083 VELA: A New Accelerator Technology Development Platform for Industry 2471
 
  • P.A. McIntosh, D. Angal-Kalinin, R.K. Buckley, S.R. Buckley, J.A. Clarke, P.A. Corlett, B.D. Fell, A.R. Goulden, C. Hill, F. Jackson, S.P. Jamison, J.K. Jones, L.B. Jones, A. Kalinin, L. Ma, J.W. McKenzie, K.J. Middleman, B.L. Militsyn, A.J. Moss, T.C.Q. Noakes, Y.M. Saveliev, D.J. Scott, B.J.A. Shepherd, R.J. Smith, S.L. Smith, T.T. Thakker, A.E. Wheelhouse, P.H. Williams
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  • N. Bliss, G. Cox, G.P. Diakun, A. Gleeson, T.J. Jones, K. Robertson, M.D. Roper, E. Snedden
    STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
  • S.T. Boogert
    Royal Holloway, University of London, Surrey, United Kingdom
  • N.J. Boulding
    FMB Oxford, Oxford, United Kingdom
  • A. Lyapin
    JAI, Egham, Surrey, United Kingdom
  • E.J. Morton
    CXR Ltd, Guildford, United Kingdom
 
  The Versatile Electron Linear Accelerator (VELA) facility will provide enabling infrastructures targeted at the development and testing of novel and compact accelerator technologies, specifically through partnership with industry and aimed at addressing applications in medicine, health, security, energy and industrial processing. The facility has now been commissioned at Daresbury Laboratory and the facility is now being actively utilised by industrial groups who are able to take advantage of the variable electron beam parameters available on VELA to either demonstrate new techniques and/or processes or otherwise develop new technologies for future commercial realisation. Examples of which to be presented include; demonstration of a new cargo scanning process, characterisation of novel, high performance beam position monitors, as well as other technology development applications.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPME083  
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