Speaker
Description
The generation of high-quality continuous-wave (CW) electron beams with parameters suitable for hard X-ray free-electron lasers (FELs) has so far not been demonstrated experimentally. Traditionally, photoinjectors operating at very high accelerating gradients are considered necessary to meet the stringent beam-quality requirements of hard X-ray FELs. While high-gradient guns have been successfully operated in pulsed mode, extending this approach to CW operation is technically challenging, and can lead to excessive field emission (dark current) and reduced photocathode lifetime.
In this talk, I will present our results demonstrating that an alternative approach using a superconducting radiofrequency (SRF) gun with a modest accelerating gradient of approximately 15 MV/m, combined with a ballistic compression beamline, can produce CW electron beams with the required parameters. I will present a detailed description of the accelerator system and report measurements of projected (0.2 mm-mrad @ 100 pC) and slice transverse emittances (0.15 mm-mrad @ 100 pC), as well as the bunch’s longitudinal phase space. The experimental results will also be compared with start-to-end simulations.
Funding Agency
DE-SC0021426 award from the U.S. Department of Energy Office of Nuclear Physics and by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704
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