Three Wavelength Coupling for Fusion Capsule Hohlraums
AssigneeLawrence Livermore National Security, LLC
InventorsEdward I. Moses, Siegfried H. Glenzer, Pierre A. Michel, Laurent Divol, Brian J. MacGowan
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Abstract
Using three tunable wavelengths on different cones of laser beams the energy transfer between beams can be tuned to redistribute the energy within the cones of beams most prone to backscatter instabilities. Using a third wavelength provides a greater level of control of the laser energy distribution and coupling in the hohlraum, to significantly reduce stimulated Raman scattering losses and increase the hohlraum radiation drive, yet maintain implosion symmetry.
Claims12
A method of applying energy to a capsule to facilitate fusion comprising using groups of laser beams, at least three of the groups of laser beams having a different wavelength from each other.
A method of transferring energy from a first group of laser beams to a second group of laser beams, both the first group and the second group entering a hohlraum at an acute angle with respect to a central axis of the hohlraum, the method comprising shifting the wavelength of the first group of laser beams with respect to the second group of laser beams by between about 0.5 and 1.7 Angstroms.
A method of controlling compression of a fusion capsule in a hohlraum having a central axis to make the compression more spherical comprising:
- introducing a first group of laser beams of first wavelength at a first angle to the central axis;
- introducing a second group of laser beams of second wavelength at a second angle to the central axis;
- introducing a third group of laser beams of third wavelength at a third angle to the central axis;
- wherein the first angle is smaller than the second angle and the second angle is smaller than the third angle;
- and the first wavelength is different from the second wavelength by between about 0.5 and 1.7 Angstroms.
Dependencies are inferred from the claim text.