Tailored ICF Target Pushing Profile with Dense Propellant Region
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Solution Overview
Problem
Conventional ICF target designs face challenges in achieving uniform energy absorption and implosion symmetry due to asymmetrical illumination and imperfections, leading to suboptimal fusion reaction conditions.
Innovation Solution
The design of an ICF target assembly with a tailored pushing profile, utilizing a graded density propellant region and specific material choices to absorb radiation energy and smooth implosion dynamics, allowing for delayed energy transfer and improved symmetry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional ICF target designs use symmetrical spherical implosion, then uniform compression is achieved, but sensitivity to manufacturing imperfections and illumination non-uniformity reduces reliability
Solution Approach 1:
The patent applies asymmetry by introducing a dense propellant region at a specific location within the target rather than uniform distribution. This deliberate asymmetric configuration compensates for expected asymmetries in illumination and manufacturing, making the implosion more robust and reliable despite imperfections in the drive mechanism and target construction.
Solution Approach 2:
The patent implements local quality by creating a localized dense propellant region with specific density characteristics at a particular location within the target. This non-uniform local property allows targeted modification of the pushing profile to counteract known asymmetries in the illumination pattern and manufacturing tolerances.
2Temperature
If complex ICF target designs are used to achieve required temperatures and densities, then fusion ignition potential is improved, but sensitivity to imperfections and difficulty in manufacturing increases
Solution Approach 1:
The patent changes the density parameter of the propellant region to create a dense propellant region with higher density than the surrounding ablator material. This parameter modification allows control over the pushing profile and energy transfer timing, achieving required fuel temperatures while using relatively simple target construction that is less sensitive to manufacturing imperfections.
3Use of energy by moving object
If asymmetrical illumination is used to drive the target, then energy delivery is achieved, but spatial non-uniformities seed instabilities that prevent ignition
Solution Approach 1:
The patent applies preliminary anti-action by pre-configuring a dense propellant region in a specific location before illumination occurs. This pre-positioned dense region acts in advance to counteract the expected asymmetrical energy absorption, smoothing out spatial non-uniformities in the pushing profile and preventing instabilities from seeding during implosion.
4Speed
If early energy transfer is used in implosion, then compression is achieved, but delayed pushing may improve symmetry and reduce instabilities
Solution Approach 1:
The patent implements preliminary action by positioning the dense propellant region to enable delayed energy transfer at a later stage of the implosion process. This timing allows the initial asymmetric disturbances to be suppressed before they can grow into significant instabilities, improving overall implosion symmetry while maintaining effective compression.
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
Enhances energy transfer efficiency and uniformity, facilitating ignition and sustained fusion reactions by reducing asymmetrical absorption and hydrodynamic instabilities, thus improving energy yield.
Implementation Method 1
utilizing a graded density propellant region and specific material choices to absorb radiation energy
Implementation Method 2
The hohlraum then converts the energy to x-rays, which then ablate the ablator region, and by the reactive force, drives the D-T inward
Implementation Method 3
The hohlraum then converts the energy to x-rays
Implementation Method 4
The inertia of the compressed fuel can keep it from expanding long enough for significant energy to be produced
Data Source
AI summary
An ICF target is designed to use external energy to compress, heat and ignite the fusion fuel within it. If a sufficient amount of fusion fuel is compressed and heated appropriately, a self-sustaining fusion reaction can occur, in which energy produced by fusion reactions continues to heat and ignite the fusion fuel within. Due to the precise selection of the key elements and unique configuration in this ICF target design, the uniformity and efficiency may substantially improve. More specifically, the unique use and composition of a void region and lamina as described herein, will advantageously allow for a smoother profile while still using a dense propellant region. This is extremely important because it allows for the non-uniformity in the x-ray radiation to be smoothed and then passed on to energize the propellant regions and the subsequent shock that the pusher shell creates by its implosion in a controlled manner.