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Watanabe, T.

Paper Title Page
RPAT067 Beam Angle Measurement Using Cherenkov Radiation 3742
 
  • T. Watanabe, M. Babzien, K. Kusche, V. Yakimenko
    BNL, Upton, Long Island, New York
  
  A simple beam angle monitor utilizing observation of far-field Cherenkov radiation is being developed. The monitor is independent of beam energy as well as position and requires only modest camera sensitivity. Since the wavefront of Cherenkov radiation is not spherical but planar, the far-field image is supposed to be infinetesimally small in one-dimensional geometrical optics, which may result in high angular resolution. In a practical experiment, however, beam scattering in a radiator and diffraction from a finite size radiation source determine the resolution. Numerical analysis shows that the angular resolution with a 100-um thickness fused silica radiator is 0.8 mrad. The experimental results with 2-mm and 100-um thickness fused silica are shown. The possibility of non-destructive measurement is also discussed.  
RPAT089 Advances in Optical Transition and Diffraction Radiation Emittance Diagnostics 4224
 
  • R.B. Fiorito, A.G. Shkvarunets
    IREAP, College Park, Maryland
  • T. Watanabe, V. Yakimenko
    BNL, Upton, Long Island, New York
  
  Funding: Office of Naval Research and the DOD Joint Technology Office.

We have performed a series of experiments using Optical Transition Radiation and Optical Diffraction Radiation Interferometry to measure the two orthogonal (x,y) rms divergences of the Brookhaven National Laboratory’s Advanced Test Facility electron beam operating at an energy of 50 MeV. Measurement of the rms divergences at the (x,y) beam waist conditions, together with corresponding measurements of the rms beam sizes allows a determination of the rms x and y emittances. A comparison of the results using OTRI and ODTRI are presented.