Author: Wootton, K.P.
Paper Title Page
TUPC046 Alignment Tolerances for Vertical Emittance 1102
 
  • K.P. Wootton, R.P. Rassool, G. Taylor
    The University of Melbourne, Melbourne, Australia
  • M.J. Boland, R.T. Dowd, G. LeBlanc, Y.E. Tan
    ASCo, Clayton, Victoria, Australia
  • Y. Papaphilippou
    CERN, Geneva, Switzerland
 
  Alignment tolerances for the CLIC main damping ring magnetic lattice elements are presented. Tolerances are defined by the design equilibrium vertical emittance of 1 pm rad. The sensitivity of the uncorrected lattice to magnet misalignments is presented. Misalignments considered included quadrupole vertical offsets and rolls, sextupole vertical offsets, and main dipole rolls. Seeded simulations were conducted in MAD-X, and compared with expectation values calculated from theory. The lattice was found to be sensitive to betatron coupling as a result of sextupole vertical offsets in the arcs. Alignment tolerances, BPM and corrector requirements are presented also. For the same misalignment types, the equilibrium emittance of the corrected lattice is simulated. These are compared with expectation values calculated from theory. The vertical alignment tolerance of arc sextupoles is again demanding.  
 
TUPC062 Electron Beam Energy Measurement at the Australian Synchrotron Storage Ring 1138
 
  • M.J. Boland
    ASCo, Clayton, Victoria, Australia
  • H. Panopoulos, R.P. Rassool, K.P. Wootton
    The University of Melbourne, Melbourne, Australia
 
  The technique of resonant spin depolarization was used to precisely measure the electron beam energy in the storage ring at the Australian Synchrotron. A detector and data acquisition system dedicated to the measurement were developed. Using the system, the long term energy stability of the storage ring was monitored and a mechanical realignment of the ring was clearly seen in the energy data. Details of the parameters used to optimize the measurement are also discussed.  
 
WEPC049 Operation and Storage Ring Calibration with the Transverse Bunch-by-Bunch Feedback System at the Australian Synchrotron 2121
 
  • M.J. Boland, Y.E. Tan
    ASCo, Clayton, Victoria, Australia
  • D.J. Peake, R.P. Rassool, K.P. Wootton
    The University of Melbourne, Melbourne, Australia
 
  The first operational experience with the transverse bunch-by-bunch feedback system for the storage ring shows a doubling of the lifetime and the ability to damp instabilities caused by IVU gap changes. The system was also used to calibrate the ring by doing simultaneous measurements on several single bunches with different bunch currents. Using the bunch-by-bunch system's capability to excite the beam to large amplitudes, the non-linear beam dynamics were also measured and compared with the model.  
 
WEPC080 Non-linear Dynamics Optimization of the CLIC Damping Rings 2205
 
  • Y. Renier, F. Antoniou, H. Bartosik, Y. Papaphilippou
    CERN, Geneva, Switzerland
  • K.P. Wootton
    The University of Melbourne, Melbourne, Australia
 
  Non-linear dynamics studies are undertaken in order to optimize the dynamic aperture of the CLIC damping rings. In this respect, advanced methods such as frequency map and resonance driving term analysis are used in order to explore the working point space with respect to single particle stability. The impact of magnet errors and misalignments, and in particular, the effect of the super-conducting damping wigglers is evaluated. Additional considerations for the working point choice are presented.