Conventional collimation and linac protection

We describe linac protection and a conventional collimation system appropriate for a next linear collider. The linac accelerating structure can be protected from “worst credible failures” by a system of sacrificial spoilers. For the collimation system we consider the effects of transverse wakefields and the transmission, heating, mechanical stress, and edge-scattering properties of scrapers. We require local chromatic correction, scraper survival for two pulses of a mis-steered beam containing 0.5×10¹² particles per pulse, average interception capability of 1% of the beam at any scraper, and zero particles incident on the final doublet in the final focus system. We describe emittance dependent limitations of this system and present formulae which determine scraper gaps. Conventional collimation systems appear adequate to collimate the beams of next generation 0.5 and 1.0 TeV c.m. linear colliders. Though we have combined functional units where possible to reduce total length, the length of our lattices for these systems are longer than 1 km per linac