将CESR转换为试验加速器，CesrTA，第2部分：真空改性
The Conversion of CESR to Operate as the Test Accelerator, CesrTA, Part 2: Vacuum Modifications
摘要：
康奈尔大学的电子/正电子储存环（CESR）在2008年5月开始的一系列加速器关闭过程中进行了修改，这大大提高了其粒子加速器的研发能力。CESR的能量跨度从1.8到5.6 GeV，电子和正电子都使其成为研究广泛的加速器物理问题和与当前光源和未来轻子阻尼环相关的仪器的理想选择。此外，其中一些也与质子加速器的束流物理有关。本文是四篇文章中的第二篇，讨论了将CESR转换为测试加速器CesrTA所需的真空系统的修改，以增强对低发射度调谐方法、电子云（EC）效应、束内散射、快离子不稳定性以及束流仪器的一般改进等主题的研究。另一篇论文介绍了超导摇摆器的真空系统改造，以适应摇摆器内EC行为的研究诊断仪器。虽然CesrTA最初的研究集中在与国际直线对撞机（ILC）阻尼环设计相关的问题上，但CesrTA是一个非常灵活的储存环，能够研究广泛的加速器物理和仪器问题。
英文摘要：
Cornell's electron/positron storage ring (CESR) was modified over a series of accelerator shutdowns beginning in May 2008, which substantially improves its capability for research and development for particle accelerators. CESR's energy span from 1.8 to 5.6 GeV with both electrons and positrons makes it ideal for the study of a wide spectrum of accelerator physics issues and instrumentation related to present light sources and future lepton damping rings. Additionally a number of these are also relevant for the beam physics of proton accelerators. This paper, the second in a series of four, discusses the modifications of the vacuum system necessary for the conversion of CESR to the test accelerator, CesrTA, enhanced to study such subjects as low emittance tuning methods, electron cloud (EC) effects, intra-beam scattering, fast ion instabilities as well as general improvements to beam instrumentation. A separate paper describes the vacuum system modifications of the superconducting wigglers to accommodate the diagnostic instrumentation for the study of EC behavior within wigglers. While the initial studies of CesrTA focussed on questions related to the International Linear Collider (ILC) damping ring design, CesrTA is a very flexible storage ring, capable of studying a wide range of accelerator physics and instrumentation questions.
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