BEAM DYNAMICS ISSUES in LINEAR COLLIDERS

The primary goal of present and future linear colliders is to maximize the integrated luminosity for the experimental program. Beam dynamics plays a central role in the maximization of integrated luminosity. It is the major issue in the production of small beam sizes and low experimental backgrounds and is also an important factor in the production of particle numbers, in the acceleration process, and in the number of bunches. The beam dynamics effects on bunches which are extracted from the damping rings, accelerated in the linac, collimated, -momentum analyzed, and finally delivered to the final focus are reviewed. The effects of bunch compression, transverse and longiludinal wakefields, BNS damping, energy definition, dispersion, emittance, bunch aspec1 ratio, feedback, and stability are all important.