The idea of using ERL as a driver for undulators to produce hard X-ray photons has established itself as one of the most promising directions to improve the brilliance beyond that which is available from the 3rd generation light sources. However, to be competitive with future proposed storage ring sources, ERL-based machine will have to deliver diffraction-limited beam with similar current or a significant fraction thereof. Thus, one has to master critical technologies pertaining to the SRF and the injector, and to understand the physics limiting the performance of ERL light source. Cornell University in collaborative effort with JLAB has started investigation of these issues. Our latest findings and results will be the subject of my presentation.


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