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Boland, M.J.

Paper Title Page
TH6PFP008 Emittance Coupling Control at the Australian Synchrotron 3708
 
  • R.T. Dowd, M.J. Boland, G. LeBlanc, Y.E. Tan
    ASCo, Clayton, Victoria
  
 

Emittance coupling in the Australian Synchrotron storage ring is currently controlled using a total of 28 skew quadrupoles. The LOCO method was used to calculate the skew quadrupole settings, using measured vertical dispersion and transverse coupling. This information is used to create a calibrated model of the machine, which is then used to calculate the required skew quadrupole settings needed to minimise coupling. This method has thus far achieved encouraging results for achieving ultra low (<2pm) vertical emittance. In this study we seek to explore the validity of the LOCO model based on empirical measurements and possible improvements of this method.

  
TH6PFP009 Low Alpha Configuration for Generating Short Bunches 3711
 
  • Y.E. Tan, D.R.T. Appadoo, M.J. Boland, R.T. Dowd
    ASCo, Clayton, Victoria
  
 

Generating short bunches for time resolved studies or the generation of THz radiation has been done at many other light sources and is of increasing interest in the user community. Light sources not designed with ps bunchs can usually tune the lattice to reduce ps bunchs without much difficulty, sometimes referred to as a Low Alpha mode. At the Australian light source a low alpha configuration has been investigated. The results looking into the 'shaping' of the momentum compaction factor, beam stability and current limitations will be presented.

  
TH6REP066 Growth/Damp Measurements and Bunch-by-Bunch Diagnostics on the Australian Synchrotron Storage Ring 4105
 
  • D.J. Peake, R.P. Rassool
    Melbourne
  • M.J. Boland, G. LeBlanc
    ASCo, Clayton, Victoria
  
 

Recently a transverse bunch-by-bunch feedback system was commissioned to combat the resistive-wall instability in the storage ring. The system successfully controls the vertical beam motion so 200 mA can be stored with all in-vacuum undulators at minimum gap and a slightly positive chromaticity setting. The FPGA that comes with the feedback system also provides powerful possibilities for diagnostic measurements. Results will be presented for a) growth/damp measurements to quantitatively characterise the resistive-wall instability, b) bunch-by-bunch diagnostics such as tune chromaticity and c) initial bunch-cleaning attempts in conjunction with a APD bunch purity measurement system.