e+ e- collider in the VLHC tunnel. Proceedings, Workshop, Chicago, USA, March 9-11, 2001
- ed.
This document is a collection of the contributions made to the March IIT workshop on an e{sup +}e{sup -} collider in the VLHC tunnel. This machine, which is based on a relatively conservative extrapolation of LEP technology, has a baseline luminosity of 10{sup 33}/cm{sup 2}/s at a CM energy of 370 GeV. The overall parameters and general description of such a machine is described in T. Sen and J. Norem, ''A Very Large Lepton Collider in the VLHC Tunnel'', to be published. A preprint of this paper is included as Appendix 2 of this report. The intention of the workshop was to define the parameters of such a collider and make them available to the community for use in further physics studies. It is clear that the machine cannot compete with a full scale linear collider. Its main interest would be if a VLHC were built and if a linear collider did not already exist. In this case, it could provide a limited and perhaps crucial view of low mass Higgs states. Although the study is incomplete, it does define rather well the parameters of the machine, as well as the challenges that the design faces. The study benefited greatly from the participation of the machine experts that were willing to spend time looking at the design. In this document, the workshop contributions are organized into sections which cover the physics motivation for the machine; the injector; beam dynamics issues in the collider; and accelerator systems. The physics section describes luminosity benchmarks for study of a light Higgs boson, and machine performance issues related to lineshape measurements at the t{bar t} threshold. The contribution on the injector presents a design for a 45 GeV injector. The injection energy is motivated by two considerations: the collider has potential stability problems at injection, which are mitigated by a relatively high injection energy; and, at this energy, the injector can also serve as a Z{sup 0} factory. One of the principal conclusions of the IIT workshop was that this was the most natural way to provide a high-luminosity Z{sup 0} factory with polarized beams. The beam dynamics contributions cover a range of topics, including experience from LEP, design options for the lattice and IR's that aim at increasing the luminosity to close to 10{sup 34}/cm{sup 2}/s, and considerations on beam stability, rf system distribution, beam separation, and radiative spin polarization of the beams. The magnet, vacuum system, and rf system required for the machine are discussed in the accelerator systems contributions. Finally, in the conclusions section, the leading R&D issues for the machine, as identified at the workshop, are summarized. In an Appendix, some thoughts on beam-beam considerations for a VLLC are provided.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-76CH03000
- OSTI ID:
- 15020137
- Report Number(s):
- FERMILAB-CONF-01-107; TRN: US0605292
- Resource Relation:
- Conference: Prepared for Workshop on an e+ e- Ring at VLHC, Chicago, Illinois, 9-11 Mar 2001
- Country of Publication:
- United States
- Language:
- English
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