Abstract
A technique is proposed to generate electron beam with ultralow transverse emittance through laser assisted transverse-to-longitudinal emittance exchange. In the scheme a laser operating in the TEM10 mode is used to interact with the electron beam in a dispersive region and to initiate the emittance exchange. It is shown that with the proposed technique one can significantly downsize an x-ray free electron laser (FEL), which may greatly extend the availability of these light sources. A hard x-ray FEL operating at 1.5 {angstrom} with a saturation length within 30 meters using a 3.8 GeV electron beam is shown to be practically feasible.
Highlights
There is growing interest in generating powerful laserlike hard x-ray pulses using the free electron lasers (FELs) [1,2,3]
The Linac Coherent Light Source (LCLS), which uses 14 GeV beam to drive the FEL, has achieved saturation [4] and is delivering unprecedented powerful x-rays that marks the beginning of a new era of xray sciences
The proposed technique can greatly bring down the size and cost of an x-ray FEL and has the potential to significantly extend the availability of such light sources to a wider user community
Summary
There is growing interest in generating powerful laserlike hard x-ray pulses using the free electron lasers (FELs) [1,2,3]. The Linac Coherent Light Source (LCLS), which uses 14 GeV beam to drive the FEL, has achieved saturation [4] and is delivering unprecedented powerful x-rays that marks the beginning of a new era of xray sciences. These facilities are so large that only a few countries can afford them and their availability is rather limited. With representative realistic beam parameters, we show that one can obtain a high brightness electron beam with 0.1 mm mrad transverse emittance Such a beam allows one to operate an 1.5 Ahard x-ray FEL using a 380 A, 3.8 GeV beam together with an 1.0 cm period invacuum undulator. The proposed technique can greatly bring down the size and cost of an x-ray FEL and has the potential to significantly extend the availability of such light sources to a wider user community
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