Abstract
A numerical simulation of a possible coherent beam-beam instability of the head-tail type is presented. The studied model employs a linearized coherent beam-beam interaction and takes complete account of the bunch length, including the deformation of the colliding bunches during their overlap. Measured head-tail mode spectra from the VEPP-2M collider are compared with the results of the analytical model and tracking. A computer code for evaluation of the coherent mode increments, which was used for analysis of possible ways to stabilize the beam-beam system, is described.
Highlights
Beam-beam effects, which are the main phenomena limiting the luminosity of modern colliders, have been the focus of accelerator physicists’ attention for a long time [1]
The residual coherent beam-beam interaction from separated e1e2 beams is known to enhance the head-tail instability caused by the transverse impedance in the LEP collider [8], and numerical studies of this combined effect were done using a model where the bunch length was neglected in calculating the beam-beam kick, i.e., for the case of a bunch much shorter than the beta-function value, bء, at the interaction point (IP) [9]
The ring is divided into N mesh elements, each characterized by its transverse dipole moment and its synchrotron phase
Summary
Beam-beam effects, which are the main phenomena limiting the luminosity of modern colliders, have been the focus of accelerator physicists’ attention for a long time [1]. A computer simulation using particle tracking becomes an important tool for analysis of the beam-beam system Another way to solve the problem is by system simplification; in particular, for small betatron oscillation amplitudes, it is often allowable to linearize the transverse force exerted by the beams on each other. The residual coherent beam-beam interaction from separated e1e2 beams is known to enhance the head-tail instability caused by the transverse impedance in the LEP collider [8], and numerical studies of this combined effect were done using a model where the bunch length was neglected in calculating the beam-beam kick, i.e., for the case of a bunch much shorter than the beta-function value, bء, at the interaction point (IP) [9].
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Physical Review Special Topics - Accelerators and Beams
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
