Author: Beaudoin, J.
Paper Title Page
WE1PB04 A Novel Optical Method for Measuring Beam Phase and Width in the Rutgers 12-Inch Cyclotron 299
  • J.L. Gonski, S. Burcher, T.W. Koeth, J.E. Krutzler, S. Lazarov
    Rutgers University, The State University of New Jersey, Piscataway, New Jersey, USA
  • J. Beaudoin
    UMD, College Park, Maryland, USA
  We present an experimental longitudinal measurement of beam and phase slippage as a function of magnetic field deviation in a weak focusing field, using proton acceleration data from the Rutgers 12-inch cyclotron. A gated camera was used to determine beam arrival time from the radiation emitted by a fast ZnO:Ga doped phosphor target when struck by accelerated protons. Images integrated light emitted in 9 degree increments over a full 360-degree RF cycle. Analysis of relative image brightness allowed for the successful acquisition of relative phase shift and azimuthal beam width over several magnetic field strengths. Theoretical predictions and simulation via Poisson Superfish and SIMION software show good agreement with data, validating the optical method for qualitative measurements. This new method is independent of dee voltage and allows for measurements to be taken in the central region of the cyclotron, where other electrically based methods of measurement are challenging due to high RF electric fields. Such characteristics validate the use of gated camera imaging for cyclotron research, and motivate future refinement of this technique for a variety of studies.  
slides icon Slides WE1PB04 [3.662 MB]