Title :
Developments in beam-based alignment and steering of the Next Linear Collider main linac
Author :
Tenenbaum, P. ; Endrickson, L. ; Raubenheimer, T.O.
Author_Institution :
Linear Accel. Center, Stanford Univ., CA, USA
Abstract :
The Next Linear Collider main linacs are 13 km linear accelerators which each contain approximately 750 hybrid iron/permanent-magnet quadrupoles in a FODO array. The small amount of vertical emittance dilution permitted in the main linacs implies a tight tolerance on the RMS distance between the beam and the centers of the quads. We describe two methods for measuring the offsets between the quads and their integrated beam position monitors, and three algorithms for steering the main linac to minimize the emittance dilution. Simulation studies of the alignment and steering algorithms are presented
Keywords :
accelerator cavities; accelerator magnets; electromagnets; electron accelerators; electron beams; high energy physics instrumentation computing; linear accelerators; particle beam diagnostics; particle beam extraction; permanent magnets; 13 km; BPM; FODO array; Fe; NLC; Next Linear Collider main linear accelerator; RMS distance; beam offsets; beam position monitors; beam-based alignment; beam-based steering; hybrid iron quadrupoles; hybrid permanent-magnet quadrupoles; tight tolerance; vertical emittance dilution; Acceleration; Colliding beam accelerators; Damping; Energy resolution; Linear accelerators; Linear particle accelerator; Particle beams; Position measurement; Radio frequency; Tuning;
Conference_Titel :
Particle Accelerator Conference, 2001. PAC 2001. Proceedings of the 2001
Conference_Location :
Chicago, IL
Print_ISBN :
0-7803-7191-7
DOI :
10.1109/PAC.2001.988270
