Two-dimensional Cooling of Ion Beams in Storage Rings by Narrow   Broad-Band Laser Beams
  A new scheme for the two-dimensional cooling of ion beams in storage rings is suggested in which ions interact with a counterpropagating broad-band laser beam. The interaction region in the direction of the ion movement is much less then the wavelength of the ion betatron oscillations. The laser beam in the orbit plane has sharp flat edge directed to the ion beam and the width of the laser beam of the order of the ion beam width. Laser beam radial position is being displaced with some velocity at first from inside and then from outside to the ion beam and decreases both betatron and synchrotron oscillations. 
E.G.Bessonov, (LPI AS, Moscow, Russia), K.-J.Kim (ANL, APS, USA) and   F.Willeke (DESY, Germany)