Linear collider diagnostics

Each major step towards higher energy particle accelerators relies on new technology. Linear colliders require beams of unprecedented brightness and stability. Instrumentation and control technology is the single most critical tool that enables linear colliders to extend our energy reach. In this paper we focus on the most challenging aspects of linear collider instrumentation systems. In the Next Linear Collider (NLC), high brightness multibunch e+/e− beams, with L±=1012 particles/pulse and σx,y∼50×5 μm, originate in damping rings and are subsequently accelerated to several hundred GeV in 2 X-band 11424 MHz linacs from which they emerge with typical σx,y∼7×1 μm. Following a high power collimation section the e+/e− beams are focused to σx,y∼300×5 nm at the interaction point. In this paper we will review the beam intensity, position and profile monitors (x, y, z), mechanical vibration sensing and stabilization systems, long baseline RF distribution systems and beam collimation hardware.