Author: Xiang, D.
Paper Title Page
THOANO02
 Experimental Demonstration of Echo-enabled Harmonic Generation at the 14th Harmonic  
 
  • D. Xiang, M.P. Dunning, C. Hast, E. Hemsing, T.O. Raubenheimer, S.P. Weathersby
    SLAC, Menlo Park, California, USA
  
  Funding: Work supported by U.S. DOE under Contract No. DE-AC02-76SF00515.
Following the successful demonstration of echo-enabled harmonic generation [1] (EEHG [2]) with n=7 [3] at SLAC's NLCTA in 2011 [4], the beam line has been upgraded recently to benchmark EEHG theory at much higher harmonics. An optical parametric amplifier has been used to provide a seed with wavelength at 2.4 μm. Using an rf undulator as the radiator, coherent radiation at the 14th harmonic of the seed, i.e. with wavelength at 171 nm, has been generated using EEHG technique with a 120 MeV beam. We will present detailed experimental results on testing EEHG at n=14. Future plans in testing EEHG at n=30~75 in the coming year will be briefly discussed as well.
[1] G. Stupakov, PRL 102, 074801 (2009).
[2] D. Xiang and G. Stupakov, PRST-AB 12, 030702 (2009).
[3] D. Xiang et al., PRL 105, 114801 (2010).
[4] D. Xiang et al., PRL 108, 024802 (2012) 		 
slides icon Slides THOANO02 [2.288 MB]  
 
THOANO04
 Experimental Studies of Echo-enabled HG FEL  
 
  • Z.T. Zhao
    SINAP, Shanghai, People's Republic of China
  • D. Xiang
    SLAC, Menlo Park, California, USA
  
  After echo-enabled HG FEL was studied theoretically and numerically, several experiments have been done to verify it. An overview of the experiments over the world and new understanding of it will be given in this talk.  
slides icon Slides THOANO04 [18.207 MB]