Degradation of multibunch luminosity in a linear collider due to cumulative beam breakup.

Bohn, C. L. ; Syphers, M. J. ; Schulte, D.

Technical Information Center Oak Ridge Tennessee

关键词: Beam-beam interactions;    Linear colliders;    Beam luminosity;    Rf systems;    Transverse momentum;   

RP-ID  :  DE2001782001

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

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.