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Rogers, J.H.P.

Paper Title Page
MOPLS071 TDR Measurements in support of ILC Collimator Studies 712
 
  • C.D. Beard, P.A. Corlett, A.J. Moss, J.H.P. Rogers
    CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
  • R.M. Jones
    Cockcroft Institute, Warrington, Cheshire
  
  In this report the outcome of the "wire method" cold test, experimental results and their relevance toward the ILC set-up is considered. A wire is stretched through the centre of a vessel along the axis that the electron beam would take, and a voltage pulse representing the electron bunch is passed along the wire. The parasitic mode loss parameter from this voltage can then be measured. The bunch length for the ILC is 0.3mm, requiring a pulse rise time of ~1ps. The fastest rise time available for a time domain reflectrometry (TDR) scope is ~10ps. Reference vessels have been examined to evaluate the suitability of the test gear at comparable bunch structures to the ILC.  
TUPCH151 ERLP/4GLS Low Level Radio Frequency System 1376
 
  • A.J. Moss, P.A. Corlett, J.F. Orrett, J.H.P. Rogers
    CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
  
  The Energy Recovery Linac Prototype (ERLP) being constructed at Daresbury Laboratory will use an analog-based low level RF (LLRF) control system designed and built at FZR Rossendorf. Once the machine is operational, the testing and development of a digital LLRF feedback system will take place using the ERLP as a testbed.  
WEPLS047 3-1/2 Cell Superconducting RF Gun Simulations 2481
 
  • C.D. Beard, J.H.P. Rogers
    CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
  • F. Staufenbiel, J. Teichert
    FZR, Dresden
  
  A 3-1/2 cell superconducting RF photocathode gun is being developed at Forschungszentrum Rossendorf to produce a high peak current, low emittance electron beam. This technology is essential to the realisation of many large scale facilities. The gun is designed for CW operation mode with 1 mA current and 9.5 MeV electron energy, and it will be installed at the ELBE superconducting electron linear accelerator. The gun will have a 3-1/2 cell niobium cavity operating at 1.3 GHz. The cavity consists of three cells with TESLA geometry and a specially designed half-cell in which the photocathode will be placed. Typical ERL-based projects require ~100 mA average current, and therefore suitable upgrade paths are required. Simulations have been carried out to evaluate the design and to determine suitable upgrades for higher current operation. Simulations of alternative cathode surface shapes are presented. Several couplers have been identified that can provide higher power to the cavity, whose integration and suitability has been verified. All the investigations that have identified possible solutions to higher current operation are discussed in this report.  
THPCH165 ERLP Quantum Efficiency Scanner 3179
 
  • P.A. Corlett, J.H.P. Rogers
    CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
  
  The Energy Recovery Linac Prototype (ERLP) under construction at Daresbury Laboratory will utilise a photoinjector as its electron source. In order to characterise the performance of the photo-cathode wafer, a low power laser is scanned across its surface and the resultant current measured to build up a map of the quantum efficiency of the wafer.