Author: Towler, J.R.
Paper Title Page
TUPC20 Technologies and R&D for a High Resolution Cavity BPM for the CLIC Main Beam 415
  • J.R. Towler, T. Lefèvre, L. Søby, M. Wendt
    CERN, Geneva, Switzerland
  • S.T. Boogert, F.J. Cullinan, A. Lyapin
    JAI, Egham, Surrey, United Kingdom
  The Main Beam (MB) LINAC of the Compact Linear Collider (CLIC) requires a beam orbit measurement system with a high spatial (50 nm) and high temporal (50 ns) resolution to resolve the beam position within the 156 ns long bunch train, traveling on an energy-chirped, minimum dispersive trajectory. A 15 GHz prototype cavity BPM has been commissioned in the probe beam-line of the CTF3 CLIC Test Facility. The performance and technical details of this prototype installation are discussed in this paper, including the 15 GHz analog down-converter, the data acquisition and the control electronics and software. An R&D outlook is given for the next steps, which requires a system of 3 cavity BPMs to investigate the full resolution potential.  
TUPC19 First Beam Tests of a Prototype Cavity Beam Position Monitor for the CLIC Main Beam 411
  • F.J. Cullinan, S.T. Boogert, A. Lyapin, J.R. Towler
    JAI, Egham, Surrey, United Kingdom
  • W. Farabolini, T. Lefèvre, L. Søby, M. Wendt
    CERN, Geneva, Switzerland
  Beam position monitors (BPMs) throughout the CLIC (Compact Linear Collider) main linac and beam delivery system must routinely operate at 50 nm resolution and be able to make multiple position measurements within a single 156 ns long bunch train. A prototype cavity beam position monitor, designed to demonstrate this performance, has been tested on the probe beamline of CTF3 (the CLIC Test Facility). Sensitivity measurements of the dipole mode position cavity and of the monopole mode reference cavity have been made. The characteristics of signals from short and long bunch trains and the dominant systematic effects have also been studied.