Energy Recovery Linac Experimental Challenges; Proceeding of Future Light Sources 2006 meeting

Abstract

Abstract ERL projects are ongoing at Jlab, Daresbury, KEK and Cornell. Here we describe the typical experimental concerns of using high-coherence and ultra-fast pulses from the Cornell ERL as an example of a new opportunity. The hi-flux mode is one where the ERL runs at 5 GeV and 100 mA. Many experiments are photonstarved, such as inelastic x-ray scattering. The highcoherence mode is obtained at 25 mA and the transverse emittances could be as low as 8 pm. The beam size will be at its smallest under this operating condition and average spectral brightness as high as 10E23 (standard units) are calculated. We expect to produce a 3 micron round emitting source for imaging and coherence experiments on individual biological cells. The ultra-fast mode is one obtained by reducing the repetition rate to 1 MHz and by increasing the bunch charge to 1 nC per pulse and compressing the natural 2 ps bunch length to less than 50 fs. We present below the science opportunities for x-ray experiments on a single atom as well as the challenges in x-ray optics, other experiments, and beam control issues when making a 1 nm focused xray beam size