Author: Lyapin, A.
Paper Title Page
MOPPR057 Development of a Cavity Beam Position Monitor for CLIC 915
  • F.J. Cullinan, S.T. Boogert, N.Y. Joshi, A. Lyapin
    JAI, Egham, Surrey, United Kingdom
  • E. Calvo, N. Chritin, F. Guillot-Vignot, T. Lefèvre, L. Søby
    CERN, Geneva, Switzerland
  • A. Lunin, M. Wendt, V.P. Yakovlev
    Fermilab, Batavia, USA
  • S.R. Smith
    SLAC, Menlo Park, California, USA
  The Compact Linear Collider (CLIC) project presents many challenges to its subsystems and the beam diagnostics in particular must perform beyond current limitations. The requirements for the CLIC main beam position monitors foresee a spacial resolution of 50 nm while delivering a 10 ns temporal resolution within the bunch train. We discuss the design of the microwave cavity pick-up and associated electronics, bench top tests with the first prototype cavity, as well as some of the machine-specific integration and operational issues.  
WEPPR079 Observations of Microbunching Instabilities from a THz Port at Diamond Light Source 3114
  • W. Shields, G.E. Boorman, V. Karataev, A. Lyapin
    JAI, Egham, Surrey, United Kingdom
  • R. Bartolini, A.F.D. Morgan, G. Rehm
    Diamond, Oxfordshire, United Kingdom
  Diamond Light source is a third generation synchrotron facility dedicated to producing radiation of outstanding brightness. Above a threshold current, the electron bunches are susceptible to the phenomenon known as the microbunching instability. This instability is characterised by the onset of radiation bursts, the wavelength of which is around one order of magnitude shorter than the bunch length. Near threshold, the bursting occurs quasi-­‐periodically, however at higher currents, the bursting appears randomly. The high frequencies involved in these emissions make detection and analysis challenging. A port specifically for the investigation of mm wave emissions has recently been built at Diamond. Ultra fast Schottky Barrier Diode detectors have been installed to obtain data for only a small fraction of the bunch revolution time in an updated data acquisition system. The threshold current and subsequent evolution of the instability have been investigated.