Author: Babzien, M.
Paper Title Page
Demonstration of Cascaded Pre-Bunching for Complete Trapping of a Relativistic Electron Beam in a Strongly Tapered Undulator  
  • N.S. Sudar, I.I. Gadjev, P. Musumeci, Y. Sakai
    UCLA, Los Angeles, California, USA
  • M. Babzien, M.G. Fedurin, M.A. Palmer, I. Pogorelsky, M.N. Polyanskiy, C. Swinson
    BNL, Upton, Long Island, New York, USA
  Funding: US DOE Office of High Energy Physics DE-SC0009914 US Dept. of Homeland Security Grant 2014-DN-077-ARI084-01 US DOE Office of Science SCGSR Graduate Student Research Fellowship
We present results of an experiment recently performed at the Brookhaven National Lab's Accelerator Test Facility showing the first successful demonstration of a cascaded pre-bunching scheme. Two modulator-chicane pre-bunchers arranged in series and a high-power CO2 laser seed manipulate the longitudinal phase space of a 52-MeV electron beam, increasing the fraction of electrons initially trapped in the stable accelerating potential of a seeded, strongly tapered undulator interaction from 25% to 95%, accelerating up to 80% of the particles to the final design energy. These results represent an important step in the development of high efficiency tapered undulator interactions, both as advanced accelerators and as high peak and average power coherent radiation sources.