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S. Betts

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2 papers

title: Production of High Harmonic X-ray Radiation from Non-linear Thomson Scattering at LLNL PLEIADES

format: conference procceeding

conference: 2005 Particle Accelerator Conference

year: 2005

11 authors: J. Lim | A. Doyuran | P. Frigola | G. Travish | J. B. Rosenzweig | S. Anderson | S. Betts | J. Crane | D. Gibson | F. Hartemann | A. Tremaine

abstract: We describe an experiment for production of high harmonic x-ray radiation from Thomson backscattering of an ultra-short high power density laser by a relativistic electron beam at the PLEIADES facility at LLNL. In this scenario, electrons execute a ``figure-8'' motion under the influence of the high-intensity laser field, where the constant characterizing the field strength is expected to exceed unity: $a_{L}=eE_{L}/m_{e}c\omega_{L}\geq1$. With large $a_{L}$ this motion produces high harmonic x-ray radiation and significant broadening of the spectral peaks. This paper is intended to give a layout of the PLEIADES experiment, along with progress towards experimental goals.

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title: HIgh Energy, High Brightness X-Rays Produced by Compton Back Scattering at the Livermore PLEIADES facility

format: journal article

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11 authors: A. M. Tremaine | S. G. Anderson | S. Betts | J. Crane | J. Gibson | F. V. Hartemann | J. S. Jacob | P. Frigola | J. Lim | J. Rosenzweig | G. Travish

abstract: PLEIADES (Picosecond Laser Electron Interaction for the Dynamic Evaluation of Structures) produces tunable 30-140 keV x-rays with 0.3-5 ps pulse lengths and up to 10^7 photons/pulse by colliding a high brightness electron beam with a high power laser. The electron beam is created by an rf photo-injector system, accelerated by a 120 MeV linac, and focused to 20 μm with novel permanent magnet quadrupoles. To produce Compton back scattered x-rays, the electron bunch is overlapped with a Ti:Sapphire laser that delivers 500 mJ, 100 fs, pulses to the interaction point. K-edge radiography at 115 keV on Uranium has verified the angle correlated energy spectrum inherent in Compton scattering and high-energy tunability of the Livermore source. Current upgrades to the facility will allow laser pumping of targets synchronized to the x-ray source enabling dynamic diffraction and time-resolved studies of high Z materials. Near future plans include extending the radiation energies to >400 keV, allowing for nuclear fluorescence studies of materials.

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title:	Production of High Harmonic X-ray Radiation from Non-linear Thomson Scattering at LLNL PLEIADES
format:	conference procceeding
conference:	2005 Particle Accelerator Conference
year:	2005
11 authors:	J. Lim \| A. Doyuran \| P. Frigola \| G. Travish \| J. B. Rosenzweig \| S. Anderson \| S. Betts \| J. Crane \| D. Gibson \| F. Hartemann \| A. Tremaine
abstract:	We describe an experiment for production of high harmonic x-ray radiation from Thomson backscattering of an ultra-short high power density laser by a relativistic electron beam at the PLEIADES facility at LLNL. In this scenario, electrons execute a ``figure-8'' motion under the influence of the high-intensity laser field, where the constant characterizing the field strength is expected to exceed unity: $a_{L}=eE_{L}/m_{e}c\omega_{L}\geq1$. With large $a_{L}$ this motion produces high harmonic x-ray radiation and significant broadening of the spectral peaks. This paper is intended to give a layout of the PLEIADES experiment, along with progress towards experimental goals.
keywords:
Download \| View \| Details \| edit \| delete

title:	HIgh Energy, High Brightness X-Rays Produced by Compton Back Scattering at the Livermore PLEIADES facility
format:	journal article
year:
11 authors:	A. M. Tremaine \| S. G. Anderson \| S. Betts \| J. Crane \| J. Gibson \| F. V. Hartemann \| J. S. Jacob \| P. Frigola \| J. Lim \| J. Rosenzweig \| G. Travish
abstract:	PLEIADES (Picosecond Laser Electron Interaction for the Dynamic Evaluation of Structures) produces tunable 30-140 keV x-rays with 0.3-5 ps pulse lengths and up to 10^7 photons/pulse by colliding a high brightness electron beam with a high power laser. The electron beam is created by an rf photo-injector system, accelerated by a 120 MeV linac, and focused to 20 μm with novel permanent magnet quadrupoles. To produce Compton back scattered x-rays, the electron bunch is overlapped with a Ti:Sapphire laser that delivers 500 mJ, 100 fs, pulses to the interaction point. K-edge radiography at 115 keV on Uranium has verified the angle correlated energy spectrum inherent in Compton scattering and high-energy tunability of the Livermore source. Current upgrades to the facility will allow laser pumping of targets synchronized to the x-ray source enabling dynamic diffraction and time-resolved studies of high Z materials. Near future plans include extending the radiation energies to >400 keV, allowing for nuclear fluorescence studies of materials.
keywords:	pbpl
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