CESR Test Accelerator

TL;DR

The paper describes the reconfiguration of the Cornell Electron Storage Ring into a test accelerator for studying ultra-low emittance damping rings, focusing on electron cloud effects, beam stability, and instrumentation techniques.

Contribution

It presents the experimental setup, instrumentation, and findings from CESR as a testbed for damping ring physics, informing the design of future linear collider damping rings.

Findings

Insights into electron cloud effects and mitigation

Development of emittance tuning techniques

Advanced beam instrumentation methods

Abstract

The Cornell Electron Storage Ring (CESR) was reconfigured in 2008 as a test accelerator to investigate the physics of ultra-low emittance damping rings. During the approximately 40 days/year available for dedicated operation as a test accelerator, specialized instrumentation is used to measure growth and mitigation of the electron cloud, emittance growth due to electron cloud, intra-beam scattering, and ions, and single and multi-bunch instabilities generated by collective effects. The flexibility of the CESR guide field optics and the integration of accelerator modeling codes with the control system have made possible an extraordinary range of experiments. Findings at CesrTA with respect to electron cloud effects, emittance tuning techniques, and beam instrumentation for measuring electron cloud, beam sizes, and beam positions are the basis for much of the design of the ILC damping rings as documented in the ILC-Technical Design Report. The program has allowed the Cornell group to cultivate the kind of talent and expertise that will be absolutely essential to the final engineering design, and commissioning of the damping rings for a linear collider.