Broad-band chopper for a CW proton linac at Fermilab
  Requirements and technical limitations to the bunch-by-bunch chopper for the Fermilab Project X are discussed. 
E. Gianfelice-Wendt, V. A. Lebedev, N. Solyak, S. Nagaitsev, D. Sun   (Fermilab)
physics.acc-ph