Laser Stripping via a Broad Stark State for a High-Intensity Proton Ring
  A new type of charge-exchange injection scheme for high-intensity proton rings that use a laser beam and an undulator magnet is proposed. The elementary stripping process is resonant photoionization via a broad Stark state formed by the Stark effect at an energy level near the peak of the potential barrier. The method used to estimate the parameters of the necessary laser beam and magnetic field is described. As an application to an actual accelerator, a laser stripping system using a high-finesse Fabry-Perot resonator and an undulator is proposed. An estimation of the photon loss due to the pumping-up of H$^0$ atoms, tunability of the system and the emittance growth due to stripping in the undulator magnet is also given. 
Isao Yamane, Toshikazu Suzuki and Ken Takayama