Low-emittance tuning at the Cornell Electron Storage Ring

Abstract

In 2008 the Cornell Electron/Positron Storage Ring (CESR) was reconfigured from an electron/positron collider to serve as a testbed for the International Linear Collider (ILC) damping rings. One of the primary goals of the CESR Test Accelerator (CesrTA) project is to develop a fast low-emittance tuning method which scales well to large rings such as the ILC damping rings, and routinely achieves a vertical emittance of order 10 pm at 2.085 GeV. This paper discusses the tuning methods developed at CesrTA to achieve low-emittance conditions. One iteration of beam-based measurement and correction requires about 10 minutes. A minimum vertical emittance of 10.3 +3.2/-3.4(sys) +/-0.2(stat) pm has been achieved at 2.085 GeV. In various configurations and beam energies the correction technique routinely achieves vertical emittance around 10 pm after correction, with RMS coupling < 0.5%. The measured vertical dispersion is dominated by beam position monitor systematics. The propagation of uncertainties in the emittance measurement is described in detail. Simulations modeling the effects of magnet misalignments, BPM errors, and emittance correction algorithm suggest the residual vertical emittance measured at the conclusion of the tuning procedure is dominated by sources other than optics errors and misalignments.

References in corpus (1)

• Vertical beam size measurement in the CESR-TA $e^{+}{e}^{-}$ storage ring using x-rays from synchrotron radiation

Cited by in corpus (9)

• Vertical beam size measurement in the CESR-TA $e^{+}{e}^{-}$ storage ring using x-rays from synchrotron radiation
• The Conversion of CESR to Operate as the Test Accelerator, CesrTA, Part 1: Overview
• Accelerator Design for the CHESS-U Upgrade
• Online storage ring optimization using dimension-reduction and genetic algorithms
• Beam Position Monitoring System at CESR
• Instrumentation for the Study of Low Emittance Tuning and Beam Dynamics at CESR
• Characterization of the International Linear Collider damping ring optics
• Measurement Techniques for Low Emittance Tuning and Beam Dynamics at CESR
• Using Sloppy Models for Constrained Emittance Minimization at the Cornell Electron Storage Ring (CESR)