| Development of Electron Beam Pumped KrF Lasers for Fusion Energy |
2008 |
18 pages |
| Authors:
J. D. Sethian; M. Friedman; J. Giuliani; R. H. Lehmberg; M. Myers; S. P. Obenschain; M. Wolford; P. Kepple; F. Hegeler; S. Swanekamp; NAVAL RESEARCH LAB WASHINGTON DC PLASMA PHYSICS DIV
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 | Direct drive with krypton fluoride (KrF) lasers is an attractive approach to inertial fusion energy (IFE): KrF lasers have outstanding beam spatial uniformity, which reduces the seed for hydrodynamic instabilities; they have short wavelength (248 nm) that increases the rocket efficiency and raises the threshold for deleterious laser-plasma instabilities; they have the capability for zooming , i.e. decreasing the spot size to follow an imploding pellet and thereby increase efficiency; ... |
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| Efficient Electron Beam Deposition for Repetitively Pulsed Krypton Fluoride Lasers |
JUN 2002 |
5 pages |
| Authors:
F. Hegeler; M. C. Meyers; M. Friedman; J. D. Sethian; S. B. Swanekamp; D. V. Rose; D. R. Welch; NAVAL RESEARCH LAB WASHINGTON DC PLASMA PHYSICS DIV
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| We have demonstrated that we can significantly increase the electron beam transmission efficiency through a pressure foil structure (hibachi) by segmenting the beam into strips to miss the hibachi support ribs. In order to increase the electron beam transmission, the cathode strips are adjusted to compensate for beam rotation and pinching. The beam propagation through the hibachi has been both measured and simulated with 1-D and 3-D codes. |
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| The Electra KrF Laser Program |
JUN 2002 |
6 pages |
| Authors:
J. D. Sethian; F. Hegeler; M. Myers; M. Friedman; S. Obenschain; R. Lehmberg; J. Giuliani; P. Kepple; S. Swanekamp; I. Smith; NAVAL RESEARCH LAB WASHINGTON DC PLASMA PHYSICS DIV
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| Electra is a repetitively pulsed, electron-beam pumped, Krypton Fluoride "KrF" laser that will develop the technologies that can meet the Inertial Fusion Energy "IFE" requirements for durability, efficiency, and cost. Electra will have a 30 cm x 30 cm optical aperture, an output of 400-900 Joules, and run at 5 Hz. The main amplifier will be pumped with two 30 cm x 100 cm e-beams, each with V = 500 ... |
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| Reduction of Enhanced Edge Emission in a Large Area Electron Beam |
2002 |
9 pages |
| Authors:
F. Hegeler; M. Friedman; M. C. Myers; J. D. Sethian; S. B. Swanekamp; NAVAL RESEARCH LAB WASHINGTON DC PLASMA PHYSICS DIV
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| This paper presents measurements of the enhanced current density along the edges of a large area electron beam as well as successful techniques that eliminate this edge effect/beam halo. The spatial and temporal current density data is obtained with a Faraday cup array at the anode, and the spatial, time-integrated current density is obtained with radiachromic film. MAGIC particle-in-cell (PIC) simulations support the experimental results. Experiments and simulations show that ... |
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| Development of a Durable, Large Area Cathode for Repetitive, Uniform Electron Beam Generation |
2002 |
5 pages |
| Authors:
Matthew C. Myers; F. Hegeler; Moshe Friedman; John D. Sethian; NAVAL RESEARCH LAB WASHINGTON DC LASER PLASMA BRANCH
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| Electra is a large-aperture, krypton-fluoride laser under development for inertial fusion energy research. The laser will require dual 500 kV, 36 A/sq cm, uniform electron beams operating at 5 Hz. Experimental studies have been performed to develop an approx. 3000 sq cm cathode capable of generating a 110 kA, 100 ns flat top beam pulse with minimal current density variation ( |
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| Fusion Electra: A Krypton Fluoride Laser for Fusion Energy |
SEP 2001 |
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| Authors:
J. Sethian; M. Friedman; J. Giuliani; R. Lehmberg; M. Myers; S. Obenschain; F. Hegeler; S. Swanekamp; NAVAL RESEARCH LAB WASHINGTON DC PLASMA PHYSICS DIV
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 | Electra is a Krypton Fluoride (KrF) laser to develop the science and technology for Inertial Fusion Energy. The objective is to develop the technologies that can meet the IFE requirements for beam quality, durability, and efficiency. Electra will use double-sided electron-beam pumping, run at 5 Hz, and have a laser output of 400-700 Joules. We will focus on technologies that can be scalable to the 50-150 kJ energy needed for ... |
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