Emittance and Energy Spread Compensation for Current and Future Low Emittance Synchrotron Light Sources

This paper presents the results of an analysis focused on the behavior of emittance, energy spread and radiated power, as well as their variations in relation to the complement of active insertion devices in National Synchrotron Light Source II (NSLS-II) operations. The spectra of radiated power of the installed insertion devices and analytic values of the emittance are compared to that measured by the NSLS-II online diagnostics. A conceptual design of a compensation wiggler that will maintain a constant emittance or energy spread is investigated for NSLS-II and a potential low emittance upgrade scenario.