PLEIADES: A picosecond Compton scattering x-ray source for advanced backlighting and time-resolved material studies

The PLEIADES (Picosecond Laser-Electron Inter-Action for the Dynamical Evaluation of Structures) facility has produced first light at 70 keV. This milestone offers a new opportunity to develop laser-driven, compact, tunable x-ray sources for critical applications such as diagnostics for the National Ignition Facility and time-resolved material studies. The electron beam was focused to 50 μm rms, at 57 MeV, with 260 pC of charge, a relative energy spread of 0.2%, and a normalized emittance of 5 mm mrad horizontally and 13 mm mrad vertically. The scattered 820 nm laser pulse had an energy of 180 mJ and a duration of 54 fs. Initial x rays were captured with a cooled charge-coupled device using a cesium iodide scintillator; the peak photon energy was approximately 78 keV, with a total x-ray flux of 1.3×106 photons/shot, and the observed angular distribution found to agree very well with three-dimensional codes. Simple K-edge radiography of a tantalum foil showed good agreement with the theoretical divergence-...

[1]  D. Leitner,et al.  Anharmonic lattice dynamics in germanium measured with ultrafast x-ray diffraction. , 2000, Physical review letters.

[2]  W. Leemans,et al.  Ultrafast Structural Dynamics in InSb Probed by Time-Resolved X-Ray Diffraction , 1999 .

[3]  R. Trebino,et al.  Increased phase-matching bandwidth in simple ultrashort-laser-pulse measurements , 2002 .

[4]  P. Sprangle,et al.  Observation of 20 eV x‐ray generation in a proof‐of‐principle laser synchrotron source experiment , 1995 .

[5]  V. Yanovsky,et al.  Novel all-reflective stretcher for chirped-pulse amplification of ultrashort pulses , 2000, IEEE Journal of Quantum Electronics.

[6]  Christopher P. J. Barty,et al.  Generation of hard x rays by ultrafast terawatt lasers , 2001 .

[7]  W. J. Gallagher,et al.  The LRL (Livermore) 100-MeV Linear Electron Accelerator and Facility , 1971 .

[8]  Kwanpyo Kim,et al.  Femtosecond X-ray Pulses at 0.4 Å Generated by 90° Thomson Scattering: A Tool for Probing the Structural Dynamics of Materials , 1996, Science.

[9]  Roman Tatchyn,et al.  The LCLS: A fourth generation light source using the SLAC linac , 1995 .

[10]  Eric Esarey,et al.  Tunable, short pulse hard x‐rays from a compact laser synchrotron source , 1992 .

[11]  Richard H. Milburn,et al.  High-Energy Photons from Compton Scattering of Light on 6.0-GeV Electrons , 1965 .

[12]  Bruce E. Carlsten,et al.  New photoelectric injector design for the Los Alamos National Laboratory XUV FEL accelerator , 1989 .

[13]  John F. Seely,et al.  A high-energy x-ray spectrometer diagnostic for the OMEGA laser , 2002 .

[14]  Zholents,et al.  Femtosecond x-ray pulses of synchrotron radiation. , 1996, Physical review letters.

[15]  F. R. Arutyunian,et al.  THE COMPTON EFFECT ON RELATIVISTIC ELECTRONS AND THE POSSIBILITY OF OBTAINING HIGH ENERGY BEAMS , 1963 .

[16]  S. Fourmaux,et al.  Non-thermal melting in semiconductors measured at femtosecond resolution , 2001, Nature.

[17]  H. Primakoff,et al.  Interaction of Cosmic-Ray Primaries with Sunlight and Starlight , 1948 .

[18]  Neville C. Luhmann,et al.  Three-dimensional theory of emittance in Compton scattering and x-ray protein crystallography. , 2001, Physical review. E, Statistical, nonlinear, and soft matter physics.

[19]  Frederic V. Hartemann,et al.  High-field electrodynamics , 2001 .