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Colby, E.R.

Paper Title Page
TUPE069 A Proof-of-principle Echo-enabled Harmonic Generation FEL Experiment at SLAC 2293
 
  • M.P. Dunning, E.R. Colby, Y.T. Ding, J.T. Frederico, A. Gilevich, C. Hast, R.K. Jobe, D.J. McCormick, J. Nelson, T.O. Raubenheimer, K. Soong, G.V. Stupakov, Z.M. Szalata, D.R. Walz, S.P. Weathersby, M. Woodley, D. Xiang
    SLAC, Menlo Park, California
  • J.N. Corlett, G. Penn, S. Prestemon, J. Qiang, D. Schlueter, M. Venturini, W. Wan
    LBNL, Berkeley, California
  • P.L. Pernet
    EPFL, Lausanne
  
 

In this paper we describe the technical design of an on-going proof-of-principle echo-enabled harmonic generation (EEHG) FEL experiment in the Next Linear Collider Test Accelerator (NLCTA) at SLAC. The experiment was designed through late 2009 and built and installed between October 2009 and January 2010. We present the design considerations, the technical realization and the expected performances of the EEHG experiment.

  
TUPE072 Preliminary results of the echo-seeding experiment ECHO-7 at SLAC 2299
 
  • D. Xiang, E.R. Colby, Y.T. Ding, M.P. Dunning, J.T. Frederico, A. Gilevich, C. Hast, R.K. Jobe, D.J. McCormick, J. Nelson, T.O. Raubenheimer, K. Soong, G.V. Stupakov, Z.M. Szalata, D.R. Walz, S.P. Weathersby, M. Woodley
    SLAC, Menlo Park, California
  • J.N. Corlett, G. Penn, S. Prestemon, J. Qiang, D. Schlueter, M. Venturini, W. Wan
    LBNL, Berkeley, California
  • P.L. Pernet
    EPFL, Lausanne
  
 

ECHO-7 is a proof-of-principle echo-enabled harmonic generation* FEL experiment in the Next Linear Collider Test Accelerator (NLCTA) at SLAC. The experiment aims to generate coherent radiation at 318 nm and 227 nm, which is the 5th and 7th harmonic of the infrared seed laser. In this paper we present the preliminary results from the commissioning run of the completed experimental setup which started in April 2010.


* G. Stupakov, PRL, 102, 074801 (2009); D. Xiang and G. Stupakov, PRST-AB, 12, 030702 (2009).

  
THPEC013 Compact Couplers for Photonic Crystal Laser-driven Accelerator Structures 4077
 
  • B.M. Cowan, M.C. Lin, B.T. Schwartz
    Tech-X, Boulder, Colorado
  • R.L. Byer, C. McGuinness
    Stanford University, Stanford, California
  • E.R. Colby, R.J. England, R.J. Noble, J.E. Spencer
    SLAC, Menlo Park, California
  
 

Photonic crystal waveguides are promising candidates for laser-driven accelerator structures because of their ability to confine a speed-of-light mode in an all-dielectric structure. Because of the difference between the group velocity of the waveguide mode and the particle bunch velocity, fields must be coupled into the accelerating waveguide at frequent intervals. Therefore efficient, compact couplers are critical to overall accelerator efficiency. We present designs and simulations of high-efficiency coupling to the accelerating mode in a three-dimensional photonic crystal waveguide from a waveguide adjoining it at 90 degrees. We discuss details of the computation, including an optimization routine to modify the geometric parameters of the coupler for maximum efficiency, the resulting transmission, and estimates of the fabrication tolerance for these devices. We include some background on the accelerator structure and photonic crystal-based optical acceleration in general.