A LASER REFLECTOR FOR MULTI-BUNCH GAMMA CONVERSIONS IN A GAMMA-GAMMA COLLIDER

One of the main challenges for a high energy gammagamma collider is th e high repetition rate required for the laser-electron-beam collisions to convert into high energy gamma beams. State-of-the-art, high power lasers have a much lower repetition rate than that of the electron pu lses. It is therefore highly desirable that the same laser pulse can b e reused. As an example, for NLC where beams collide at 120 Hz, within each collision cycle there are 90 electron bunches separated by 1.4 n s between successive bunches. We show, by invoking a recently invented laser optical box, that the laser pulses can be resused for the entir e train of bunches within each collision cycle.