NDLI: Gamma-ray compton light source development at LLNL

Content Provider	IEEE Xplore Digital Library
Author	Hartemann, F.V. Anderson, S.G. Gibson, D.J. Hagmann, C.A. Johnson, M.S. Jovanovic, I. Messerly, M.J. Pruet, J.A. Shverdin, M.Y. Tremaine, A.M. McNabb, D.P. Siders, C.W. Barty, C.P.J.
Copyright Year	2007
Description	Author affiliation: Lawrence Livermore National Laboratory, CA 94550 USA (Hartemann, F.V.; Anderson, S.G.; Gibson, D.J.; Hagmann, C.A.; Johnson, M.S.; Jovanovic, I.; Messerly, M.J.; Pruet, J.A.; Shverdin, M.Y.; Tremaine, A.M.; McNabb, D.P.; Siders, C.W.; Barty, C.P.J.)
Abstract	A new class of tunable, monochromatic λ-ray sources capable of operating at high peak and average brightness is currently being developed at LLNL for nuclear photo-science and applications. These novel systems are based on Compton scattering of laser photons by a high brightness relativistic electron beam produced by an rf photoinjector. A prototype, capable of producing ≫ $10^{8}$ 0.7 MeV photons in a single shot, with a fractional bandwidth of 1%, and a repetition rate of 10 Hz, is currently under construction at LLNL; this system will be used to perform nuclear resonance fluorescence experiments. A new symmetrized S-band rf gun, using a Mg photocathode, will produce up to 1 nC of charge in an 8 ps bunch, with a normalized emittance modeled at 0.8 mm.mrad; electrons are subsequently accelerated up to 120 MeV to interact with a 500 mJ, 10 ps, 355 nm laser pulse and generate γ-rays. The laser front end is a fiber-based system, using corrugated-fiber Bragg gratings for stretching, and drives both the frequency-quadrupled photocathode illumination laser and the Nd:YAG interaction laser. Two new technologies are used in the laser: a hyper-Michelson temporal pulse stacker capable of producing 8 ps square UV pulses, and a hyper-dispersion compressor for the interaction laser. Other key technologies, basic scaling laws, and recent experimental results will also be presented, along with an overview of future research and development directions.
Starting Page	1382
Ending Page	1386
File Size	2744379
Page Count	5
File Format	PDF
ISBN	9781424409136
DOI	10.1109/PPPS.2007.4652445
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-06-17
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Laser beams Fiber lasers Gratings Scattering Photonics Brightness Bandwidth
Content Type	Text
Resource Type	Article

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