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Jansson, A.

Paper Title Page
PS04 Design of a Magnetic Quadrupole Pick-Up for the CERN PS 108
 
  • A. Jansson, L. Søby, D.J. Williams
    CERN, Geneva, Switzerland
 
  A quadrupole pick-up is sensitive to the quantity σ2x - σ2y, where σx and σy are the horizontal and vertical r.m.s. beam sizes. Since it is a non-invasive device, it is potentially very useful for matching and emittance measurements. A magnetic quadrupole pick-up has been developed for the CERN PS. By coupling to the radial component of the magnetic field around the beam, it was possible to eliminate the common-mode problem, which is usually a limiting factor in the use of quadrupole pick-ups. This paper presents the final pick-up design, which is the result of a series of simulations and test prototypes. The performance of the pick-up and its associated electronics is discussed. Preliminary results from the two pick-ups recently installed in the PS machine are also presented.  
PM11 Injection Matching Studies Using Turn-By-Turn Beam Profile Measurements in the CERN PS 189
 
  • M. Benedikt, Ch. Carli, Ch. Dutriat, A. Jansson, M. Giovannozzi, M. Martini, U. Raich
    CERN, Geneva, Switzerland
 
  The very small emittance beam needed for the LHC requires that the emittance blow-up in its injector machines must be kept to a minimum. Mismatch upon the beam transfer from one machine to the next is a potential source of such blow-up. The CERN PS ring is equipped with 3 Secondary Emission Grids (SEM-Grids) which are used for emittance measurement at injection. One of these has been converted to a multi-turn mode, in which several tens of consecutive beam passages can be observed. This allows the study of mismatch between the PS-Booster and the PS. This paper describes the instrument and experimental results obtained during the last year.