Author/Authors :
Tatchyn، نويسنده , , Joel R. Levin & Arthur M. Glenberg
، نويسنده , , J. and Baltay، نويسنده , , M. and Bane، نويسنده , , K. and Boyce، نويسنده , , R. and Cornacchia، نويسنده , , M. and Cremer، نويسنده , , T. and Fisher، نويسنده , , A. and Hahn، نويسنده , , S.-J. and Hernandez، نويسنده , , John M. and Loew، نويسنده , , G. and Miller، نويسنده , , R. and Nelson، نويسنده , , W.R. and Nuhn، نويسنده , , H.-D. and Palmer، نويسنده , , D. and Paterson، نويسنده , , Stephen J. and Raubenheimer، نويسنده , , T. and Weaver، نويسنده , , Frieder J. and Wiedemann، نويسنده , , H. and Winick، نويسنده , , H. and Pellegrini، نويسنده , , C. and Travish، نويسنده , , G. and Scharlemann، نويسنده , , E.T. and Caspi، نويسنده , , S. and Fawley، نويسنده , , W. and Halbach، نويسنده , , K. and Kim، نويسنده , , K.-J. and Schlueter، نويسنده , , R. and Xie، نويسنده , , M. and Meyerhofer، نويسنده , , D. and Bonifacio، نويسنده , , R. and De Salvo، نويسنده , , L.، نويسنده ,
Abstract :
In recent years significant studies have been initiated on the feasibility of utilizing a portion of the 3 km S-band accelerator at SLAC to drive a short wavelength (4.5−1.5 Å) Linac Coherent Light Source (LCLS), a Free-Electron Laser (FEL) operating in the Self-Amplified Spontaneous Emission (SASE) regime. Electron beam requirements for single-pass saturation in a minimal time include: 1) a peak current in the 7 kA range, 2) a relative energy spread of <0.05%, and 3) a transverse emittance, ε [rad-m], approximating the diffraction-limit condition ε = λ4π, where λ[m] is the output wavelength. Requirements on the insertion device include field error levels of 0.02% for keeping the electron bunch centered on and in phase with the amplified photons, and a focusing beta of 8 m/rad for inhibiting the dilution of its transverse density. Although much progress has been made in developing individual components and beam-processing techniques necessary for LCLS operation down to ∼20 Å, a substantial amount of research and development is still required in a number of theoretical and experimental areas leading to the construction and operation of a 4.5−1.5 Å LCLS. In this paper we report on a research and development program underway and in planning at SLAC for addressing critical questions in these areas. These include the construction and operation of a linac test stand for developing laser-driven photocathode rf guns with normalized emittances approaching 1 mm-mrad; development of advanced beam compression, stability, and emittance control techniques at multi-GeV energies; the construction and operation of a FEL Amplifier Test Experiment (FATE) for theoretical and experimental studies of SASE at IR wavelengths; an undulator development program to investigate superconducting, hybrid/permanent magnet (hybrid/PM), and pulsed-Cu technologies; theoretical and computational studies of high-gain FEL physics and LCLS component designs; development of X-ray optics and instrumentation for extracting, modulating, and delivering photons to experimental users; and the study and development of scientific experiments made possible by the source properties of the LCLS.
