Theory and Suppression of Multibunch Beam Breakup in Linear Colliders
نویسندگان
چکیده
An analytic theory of cumulative multibunch beam breakup in linear colliders is developed. Included is a linear variation of transverse focusing across the bunch train as might be applied, e.g., by chirping the radiofrequency power sources or by using radiofrequency quadrupole magnets. The focusing variation saturates the exponential growth of the beam breakup and establishes an algebraic decay of the transverse bunch displacement versus bunch number. A closed-form expression for the transverse displacement is developed. It is used to quantify the total normalized emittance and thereby isolate the region of parameter space corresponding to high multibunch luminosity. The sensitivity of multibunch beam breakup to variations in accelerator and beam parameters is likewise quantified. Fermilab FERMILAB-Conf-00/178-T August 2000 THEORY AND SUPPRESSION OF MULTIBUNCH BEAM BREAKUP IN LINEAR COLLIDERS* C. L. Bohn and K.-Y. Ng, Fermilab, Batavia, IL 60510, USA
منابع مشابه
Preserving high multibunch luminosity in linear colliders
An analytic theory of cumulative multibunch beam breakup in linear colliders is developed. Included is a linear variation of transverse focusing across the bunch train as might be applied, e.g., by chirping the radio frequency power sources or by using radio frequency quadrupole magnets. The focusing variation saturates the exponential growth of the beam breakup and establishes an algebraic dec...
متن کاملExperimental investigation of multibunch, multipass beam breakup in the Jefferson Laboratory Free Electron Laser Upgrade Driver
In recirculating accelerators, and, in particular, energy-recovery linacs, the maximum current can be limited by multipass, multibunch beam breakup (BBU), which occurs when the electron beam interacts with the higher-order modes (HOMs) of an accelerating cavity on the accelerating pass and again on the energy recovering pass. This effect is of particular concern in the design of modern high ave...
متن کاملControlling transverse multibunch instabilities in linacs of high-energy linear colliders.
In this paper, we study multibunch beam breakup, with emphasis on theoretical methods applicable to the design of a linear collider with center-of-mass energy near 1 TeV. One way to significantly improve the luminosity and energy transfer efficiency of such a collider is to accelerate a train of bunches rather than just a single bunch each time the linac accelerating structure is filled with a ...
متن کاملDesign and Simulation of Accelerating Structures for Future Linear Colliders
In order to obtain high luminosity and energy efficiency in future linear colliders, it is desirable to accelerate a train of closely spaced bunches on each rf pulse of the machine. There can be severe multibunch beam break-up in such a collider unless some means of strongly suppressing the transverse wakefield is incorporated into the design of the accelerating structures. Two methods of wakef...
متن کاملMultibunch Beam Breakup in High Energy Linear Colliders’
The SLAC design for a next-generation linear collider with center-of-mass energy of 0.5 to 1.0 TeV requires that multiple bunches (10) be accelerated on each RF fill. At the beam intensity (1O’O particles per bunch) and RF frequency (11 to 17 GHz) required, the beam would be highly unstable transversely. Using computer simulation and analytic models, we have studied several possible methods of ...
متن کامل