Laser-Driven Inertial Confinement for Tritium Production
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Solution Overview
Problem
The current method for tritium production relies on limited Canadian Deuterium Uranium (CANDU) reactors, leading to a constrained supply and potential bottleneck in the fusion energy supply chain, exacerbated by the short half-life of tritium and increasing demand from fusion technology companies.
Innovation Solution
The use of laser light to efficiently excite a shock wave in a target assembly, including a fusion sample, by splitting a high-energy laser pulse into multiple beams and spatially shaping them into concentric rings, with controlled time intervals and spatial separations to match the propagation trajectory of the shock wave, achieving the conditions required for thermonuclear fusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple laser beams are focused on the opaque surface of a target sphere to launch a shock wave, then three-dimensional shock focusing at the center is achieved, but much of the laser light is reflected by the generated plasma, reducing shock generation efficiency
Solution Approach 1:
The patent transitions from three-dimensional spherical shock focusing to two-dimensional planar shock focusing. By using a planar target assembly with a shock propagation layer instead of a spherical target, the laser beams can illuminate the target from the side rather than through an opaque surface, allowing most incident laser light to be absorbed by the shock propagation layer and converted into shock wave energy, thereby eliminating the plasma reflection problem while achieving effective shock focusing in the plane of the layer
Solution Approach 2:
The patent extracts the shock propagation layer as a separate, optically accessible component from the traditional spherical target structure. This layer is positioned between the laser beams and the fusion sample, allowing the laser energy to be absorbed and converted into shock waves without being blocked or reflected by plasma generated at an opaque surface, thus separating the functions of energy absorption and shock focusing
2Device complexity
If a single high-energy laser pulse is used, then simple apparatus configuration is maintained, but the shock wave cannot achieve the extreme pressures and temperatures required for thermonuclear fusion
Solution Approach 1:
The patent segments a single high-energy laser pulse into multiple lower-energy sub-pulses using beam splitters. These sub-pulses are then spatially shaped into multiple concentric rings that impinge on the target at different locations and times, creating multiple shock waves that constructively interfere and focus at a central point, achieving extreme pressures that would not be possible with a single pulse of equivalent total energy
Solution Approach 2:
The patent employs periodic action by using multiple laser pulses delivered in a specific temporal sequence. Each pulse generates a shock wave, and by controlling the time intervals between pulses, the shock waves are timed to converge and reinforce each other at the focal point, building up extreme pressures through cumulative constructive interference
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method allows for efficient laser excitation of a velocity-matched shock wave, achieving extreme pressures and temperatures necessary for thermonuclear fusion, thereby addressing the tritium scarcity issue and providing a sustainable solution for fusion reactor applications.
Implementation Method 1
most of the incident laser light can be absorbed by the shock propagation layer, thereby contributing effectively to the buildup of the shock wave
Implementation Method 2
efficient laser excitation of a velocity-matched shock wave, achieving extreme pressures and temperatures necessary for thermonuclear fusion
Implementation Method 3
achieving the conditions required for thermonuclear fusion
Data Source
AI summary
An apparatus and method produce, from a Gaussian laser pulse, a sequence of laser rings having a spatiotemporal configuration such that impingement of the laser rings on a surface of a nuclear material in a target assembly produces constructively interfering shock waves that converge on a focal region of the nuclear material, thereby producing sufficient pressures and temperatures to form tritium in the focal region. The temporal and/or spatial intervals between the concentric pulsed laser rings are adjusted to substantially match propagation times of impingement from one ring to the next in a shock propagation layer of the target assembly. A second laser or neutron tube may be used to create a cavitation bubble at the focus. In addition to the shock waves generated in the plane of the surface, through-plane shock waves can be generated to increase the overall shock pressure.