NSLS-II Project Seminar

The Cornell Electron Storage Ring is being reconfigured to operate as a damping ring test accelerator. At a beam energy of 2GeV in the 768m circumference ring, superconducting wigglers reduce the radiation damping time by nearly an order of magnitude. With the wigglers deployed in regions of zero horizontal dispersion, the equilibrium emittance will be 2.5nm. Our target vertical emittance is 5 pm. I will report on the result of a paper study of sensitivities of emittance to optical errors and magnet misalignments in CesrTA. We use simulations to determine the efficacy of beam based emittance tuning algorithms, and the implications for survey tolerances, and beam position monitor resolution. I will also describe a technique for extracting dispersion based on a measurement at each BPM of the amplitude and phase of driven synchrotron oscillations. I will show CESR measurements of the evolution and decay of the electron cloud with trains of positron bunches and a low current witness bunch. I will also describe instrumentation that we are installing in CESR for measuring electron cloud density and energy spectrum and our experimental program to investigate the dependence of electron cloud on beam configuration, magnetic field, and chamber chemistry.