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9 Aug 1999

Volume 75, Issue 6, pp. 745-878

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Variable profile capillary discharge for improved phase matching in a laser wakefield accelerator

D. Kaganovich, P. Sasorov, C. Cohen, and A. Zigler

Appl. Phys. Lett. 75, 772 (1999); http://dx.doi.org/10.1063/1.124508 (3 pages) | Cited 38 times

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We have demonstrated the possibility to generate long plasma channels with a variable plasma density profile in a longitudinal direction. Such plasma channels can be used to control the velocity of the guided high-intensity laser beams in order to extend the acceleration distance. The measured plasma density profiles at the capillary exit were found in excellent agreement with the numerical simulations. © 1999 American Institute of Physics.
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41.75.Jv Laser-driven acceleration
29.20.-c Accelerators
52.50.Jm Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.)
42.65.Re Ultrafast processes; optical pulse generation and pulse compression
42.60.Jf Beam characteristics: profile, intensity, and power; spatial pattern formation

Soft x-ray measurements of z-pinch-driven vacuum hohlraums

K. L. Baker, J. L. Porter, L. E. Ruggles, G. A. Chandler, Chris Deeney, M. Vargas, Ann Moats, Ken Struve, J. Torres, J. McGurn, W. W. Simpson, D. L. Fehl, R. E. Chrien, W. Matuska, and G. C. Idzorek

Appl. Phys. Lett. 75, 775 (1999); http://dx.doi.org/10.1063/1.124509 (3 pages) | Cited 18 times

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This letter reports the experimental characterization of a z-pinch-driven vacuum hohlraum. We have measured soft x-ray fluxes of 5×1012 W/cm2 radiating from the walls of hohlraums which are 2.4–2.5 cm in diameter by 1 cm tall. The x-ray source used to drive these hohlraums was a z pinch consisting of a 300 wire tungsten array driven by a 20 MA, 100 ns current pulse. In this hohlraum geometry, the z-pinch x-ray source can produce energies in excess of 800 kJ and powers in excess of 100 TW to drive these hohlraums. The x rays released in these hohlraums represent greater than a factor of 25 in energy and more than a factor of 3 in x-ray power over previous laboratory-driven hohlraums. © 1999 American Institute of Physics.
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52.55.Ez Theta pinch
07.85.Fv X- and γ-ray sources, mirrors, gratings, and detectors
52.57.-z Laser inertial confinement
28.52.Av Theory, design, and computerized simulation
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