Influence of collective effects on the performance of high-luminosity colliders

Technical Report · Fri May 25 00:00:00 EDT 1990

DOI:https://doi.org/10.2172/6874765· OSTI ID:6874765

Zisman, M S ^[1]

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1. Lawrence Berkeley Lab., CA (USA)

The design of a high-luminosity electron-positron collider to study B physics is a challenging task from many points of view. In this paper we consider the influence of collective effects on the machine performance; most of our findings are generic,'' in the sense that they depend rather weakly on the details of the machine design. Both single-bunch and coupled-bunch instabilities are described and their effects are estimated based upon an example machine design (APIARY-IV). In addition, we examine the possibility of emittance growth from intrabeam scattering and calculate the beam lifetime from both Touschek and gas scattering. We find that the single-bunch instabilities should not lead to difficulty, and that the emittance growth is essentially negligible. At a background gas pressure of 10 nTorr, beam lifetimes of only a few hours are expected. Multibunch growth rates are very severe, even when using an optimized RF system consisting of single-cell, room-temperature RF cavities with geometrical shapes typical of superconducting cavities. Thus, a powerful feedback system will be required. In terms of collective effects, it does not appear that there are any fundamental problems standing in the way of successfully designing and building a high-luminosity B factory. 15 refs., 21 figs., 5 tabs.

• Research Organization: SLAC National Accelerator Lab., Menlo Park, CA (United States)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: AC03-76SF00098; AC03-76SF00515
• OSTI ID: 6874765
• Report Number(s): SLAC-ABC-8; ON: DE90012654; TRN: 90-019804
• Country of Publication: United States
• Language: English

Related Subjects

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