PAC09 - List of Authors (Carr, R.)

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Carr, R.

Paper	Title	Page
WE5RFP041	First Results of the LCLS Laser-Heater System	2358
	P. Emma, R.F. Boyce, A. Brachmann, R. Carr, F.-J. Decker, Y.T. Ding, D. Dowell, S.A. Edstrom, J.C. Frisch, A. Gilevich, G.R. Hays, P. Hering, Z. Huang, R.H. Iverson, Yu.I. Levashov, H. Loos, A. Miahnahri, H.-D. Nuhn, B.D. Poling, D.F. Ratner, J.L. Turner, J.J. Welch, W.E. White, Z.R. Wolf, J. Wu SLAC, Menlo Park, California S. Spampinati ELETTRA, Basovizza
	Funding: Work supported by the U.S. Dept. of Energy contract #DE-AC02-76SF00515. The Linac Coherent Light Source (LCLS) is an x-ray Free-Electron Laser (FEL) project presently in a commissioning phase at SLAC. The very bright electron beam required for the FEL is also susceptible to a micro-bunching instability* in the magnetic bunch compressors, prior to the FEL undulator. The uncorrelated electron energy spread can be increased by an order of magnitude to provide strong Landau damping against the instability without degrading the free-electron laser performance. To this end, a ‘laser-heater’ system has been installed in the LCLS injector, which modulates the energy of a 135-MeV electron bunch with an IR laser beam in a short undulator, enclosed within a four-dipole chicane. The last half of the chicane time-smears the energy modulation leaving an effective thermal energy spread increase. We present the first commissioning results of this system, its operational issues, and its impact on the micro-bunching instability. *Z. Huang et. al., Phys. Rev. ST Accel. Beams 7, 074401 (2004).

Paper

Title

Page

WE5RFP041

First Results of the LCLS Laser-Heater System

2358

P. Emma, R.F. Boyce, A. Brachmann, R. Carr, F.-J. Decker, Y.T. Ding, D. Dowell, S.A. Edstrom, J.C. Frisch, A. Gilevich, G.R. Hays, P. Hering, Z. Huang, R.H. Iverson, Yu.I. Levashov, H. Loos, A. Miahnahri, H.-D. Nuhn, B.D. Poling, D.F. Ratner, J.L. Turner, J.J. Welch, W.E. White, Z.R. Wolf, J. Wu
SLAC, Menlo Park, California
S. Spampinati
ELETTRA, Basovizza

Funding: Work supported by the U.S. Dept. of Energy contract #DE-AC02-76SF00515.

The Linac Coherent Light Source (LCLS) is an x-ray Free-Electron Laser (FEL) project presently in a commissioning phase at SLAC. The very bright electron beam required for the FEL is also susceptible to a micro-bunching instability* in the magnetic bunch compressors, prior to the FEL undulator. The uncorrelated electron energy spread can be increased by an order of magnitude to provide strong Landau damping against the instability without degrading the free-electron laser performance. To this end, a ‘laser-heater’ system has been installed in the LCLS injector, which modulates the energy of a 135-MeV electron bunch with an IR laser beam in a short undulator, enclosed within a four-dipole chicane. The last half of the chicane time-smears the energy modulation leaving an effective thermal energy spread increase. We present the first commissioning results of this system, its operational issues, and its impact on the micro-bunching instability.

*Z. Huang et. al., Phys. Rev. ST Accel. Beams 7, 074401 (2004).