Title :
Degradation of multibunch luminosity in a linear collider due to cumulative beam breakup
Author :
Bohn, C.L. ; Syphers, M. ; Schulte, D.
Author_Institution :
Fermi Nat. Accel. Lab., Batavia, IL, USA
Abstract :
Beam-excited transverse wakes in accelerating radiofrequency structures will influence the transverse offsets of each bunch in a multibunch train, causing the projected emittance of the bunch train to grow. An analytic theory of this phenomenon that includes the mitigating influence of a correlated energy spread across the bunch train was recently devised and applied to electron-positron linear colliders. We use the results of this theory to estimate analytically the associated degradation of multibunch luminosity in terms of top-level parameters for the two beams, the two accelerators, and the final-focus system. Then we compare the estimates with results from GUINEA-PIG, a code that includes the detailed physics of beam-beam interactions
Keywords :
accelerator RF systems; electron accelerators; electron beam focusing; high energy physics instrumentation computing; linear colliders; particle beam bunching; particle beam extraction; particle beam stability; GUINEA-PIG code; MBBU; accelerating radiofrequency structures; beam-beam interactions; beam-excited transverse wakes; cumulative beam breakup; electron-positron linear colliders; energy spread; final-focus system; linear collider; multibunch luminosity degradation; multibunch train; projected emittance; Colliding beam accelerators; Colliding beam devices; Damping; Degradation; Equations; Linear particle accelerator; Particle beams; Physics; Positrons; Radio frequency;
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.2001.987208
