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Burrows, I.

Paper Title Page
MOPC073 Design of an Upgrade to the ALICE Photocathode Electron Gun 235
 
  • B. L. Militsyn, B. D. Fell, L. B. Jones, J. W. McKenzie, K. J. Middleman
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
  • I. Burrows, R. J. Cash
    STFC/DL, Daresbury, Warrington, Cheshire
  • S. N. Kosolobov, H. E. Scheibler, A. S. Terekhov
    ISP, Novosibirsk
 
  The design of an upgrade to the GaAs photocathode electron gun of the Energy Recovery Linac Prototype (ERLP) at Daresbury Laboratory is presented. This proposed upgrade includes a reduction of the photocathode diameter from 32 to 10 mm and the installation of a dedicated photocathode preparation system with side loading of the photocathodes. The preparation system forms a united vacuum system with the gun but is separated by a gate valve. This allows for significant improvements to the vacuum conditions in the gun and a reduction of pollution from caesium vapour which improves gun stability under high voltage. This preparation facility will reduce the time taken for photocathode changeover from weeks to hours. The facility should provide photocathodes with higher quantum efficiency due to a more controllable preparation procedure and allows experiments to be performed with photocathodes activated to different levels of electron affinity.