Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..apr.u5004w&link_type=abstract
American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As
Astronomy and Astrophysics
Astrophysics
Scientific paper
Advances in technology make it possible to use the SLAC linac to drive the LCLS (1), a coherent x-ray source which will deliver sub-picosecond pulses at wavelengths down to 1.5 Angstroms with an instantaneous (peak) power up to 10 GW, corresponding to a brightness 10 orders of magnitude greater than x-ray beams from the most advanced synchrotron light sources. The LCLS operates on the principle of Self-Amplified Spontaneous Emission-SASE (2); i.e., coherent emission is achieved without an optical cavity by inducing a bunch-density modulation at the scale of the optical wavelength in a single pass of a high peak current, low emittance, 15 GeV electron beam through a 100m undulator. The LCLS, and a similar project planned at DESY in Hamburg, exploit recent technological developments; high-brightness rf photocathode electron guns, emittance preservation during acceleration and compression, precision undulator magnets, and high power x-ray optics. The unique properties of LCLS radiation enable new scientific opportunities in femtochemistry, nanoscale dynamics in condensed matter, atomic physics, biological imaging, plasma physics, and warm condensed matter. A collaboration including 4 US national labs (Argonne, Brookhaven, Lawrence Livermore, and Los Alamos) along with SLAC and UCLA is conducting r&d aiming for an LCLS construction start in 2004. 1. P.Emma; Proc. Part. Accel. Conf.(PAC2001); June 18-22, 2001. 2. R.Bonifacio, C.Pellegrini, L.Narducci; Optics Comm. 50,373(1984) *Supported by the Office of Basic Energy Sciences, US Dept. of Energy.
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