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Scott, D.J.

Paper Title Page
MOPKF058 Construction of an APPLE-II Type Undulator at Daresbury Laboratory for the SRS 440
 
  • F.E. Hannon, J.A. Clarke, C. Hill, A.A. Muir, D.J. Scott, B.J.A. Shepherd
    CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
  
  A new variable polarisation undulator of the APPLE-II type has been designed and constructed at Daresbury Laboratory. Testing of the 56mm period device has recently started in the new Magnet Test Facility at Daresbury Laboratory. This paper presents the magnetic and mechanical design of the undulator, and the first magnetic measurement results.  
MOPKF064 Design Considerations for a Helical Undulator for the Production of Polarised Positrons for TESLA 458
 
  • D.J. Scott, S.C. Appleton, J.A. Clarke, B. Todd
    CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
  • E. Baynham, T.W. Bradshaw, S.C. Carr, Y. Ivanyushenkov, J. Rochford
    CCLRC/RAL/ASTeC, Chilton, Didcot, Oxon
  
  An efficient and simple method for the production of positrons, in the necessary quantities, is one of the problems facing proposals for any future e+ e- Linear Collider project. The possibility of colliding polarised beams would also be an advantage. One method to produce a polarised positron beam uses circularly polarised radiation generated by the main electron beam passing through a helical undulator. Design considerations and calculations for two undulators, based on super-conducting and pure permanent magnet technologies, for the TESLA machine, are presented.  
MOPKF065 Magnet Block Sorting for Variably Polarising Undulators 461
 
  • D.J. Scott
    CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
  
  Effective sorting of permanent magnet blocks for undulators can reduce the adverse effects of magnetic in-homogeneities and engineering tolerances on the electron beam. For variably polarising undulators the number of different modes of operation make defining the objective function of a particular permutation more difficult than for a planar device. Factors required in defining a good objective function for a new APPLE-II type helical undulator for the SRS are discussed. These factors include calculating the magnetic field integrals, the particle trajectory and rms optical phase error. The effects of different weighting of these functions in the objective function are also discussed. A comparison of different optimisation techniques, including simulated annealing and Monte Carlo methods is also made.