Approach to Nuclear Fusion Utilizing Dynamics of High-Density Electrons and Neutrals

Deep modelling of plasma and neutral fluctuations from gas puff turbulence imaging

The role of turbulence in setting boundary plasma conditions is presently a key uncertainty in projecting to fusion energy reactors. To robustly diagnose edge turbulence, we develop and demonstrate a technique to translate brightness measurements of HeI line radiation into local plasma fluctuations via a novel integrated deep learning framework that combines neutral transport physics and collisional radiative theory for the $3^3 D - 2^3 P$ transition in atomic helium. The tenets for experimental validity are reviewed, illustrating that this turbulence analysis for ionized gases is transferable…

基于Hilbert展开的流体模型：用于描述聚变装置等离子体边缘中性粒子的动理学方程

Hilbert expansion based fluid models for kinetic equations describing neutral particles in the plasma edge of a fusion device

针对聚变装置等离子体边缘中性粒子的瞬态动理学方程，通过基于分裂的方法结合输运与电荷交换碰撞，推导出基于Hilbert展开的流体模型，并在流体动力学和扩散两种标度下评估了其性能。

Influence of Electromagnetic Fields on Nuclear Processes

Although the energies associated with nuclear reactions are due primarily to interactions involving nuclear forces, the rates and probabilities associated with those reactions are effectively governed by electromagnetic forces. Charges in the local environment can modulate the Coulomb barrier, and thereby change the rates of nuclear processes. Experiments are presented in which low-temperature electrons are attached to high-density rotating neutrals to form negative ions. The steady-state quiescent rotating plasma generated here lends itself to first prove the principle that low temperature sy…

Collective Effects and Intense Beam-Plasma Interactions in Ion-Beam-Driven High Energy Density Matter and Inertial Fusion Energy

For the successful generation of ion-beam-driven high energy density matter and heavy ion fusion energy, intense ion beams must be transported and focused onto a target with small spot size. One of the successful approaches to achieve this goal is to accelerate and transport intense ion charge bunches in an accelerator and then focus the charge bunches ballistically in a section of the accelerator that contains a neutralizing background plasma. This requires the ability to control space-charge effects during un-neutralized (non-neutral) beam transport in the accelerator and transport sections,…

聚变等离子体的逆渲染：从成像系统推断等离子体成分

Inverse Rendering of Fusion Plasmas: Inferring Plasma Composition from Imaging Systems

本研究提出聚变等离子体可微渲染逆渲染管线，可整合任意等离子体量表示到非线性优化框架，能仅靠成像等数据反推多种等离子体参数，且适配真实成像系统的非理想条件。

高场轴对称串列磁镜的约束性能预测

Confinement performance predictions for a high field axisymmetric tandem mirror

本文利用集成端塞仿真、中心室POPCON新公式与机器学习优化，预测高场轴对称Hammir串列磁镜可在更保守参数下实现Q>5并支撑聚变试点电厂。

Enhanced D-D Fusion Rates when the Coulomb Barrier Is Lowered by Electrons

A profusion of unbound, low-energy electrons creates a local electric field that reduces Coulomb potential and increases quantum tunneling probability for pairs of nuclei. Neutral beam-target experiments on deuterium-deuterium fusion reactions, observed with neutron detectors, show percentage increases in fusion products are consistent with electron-screening predictions from Schrodinger wave mechanics. Experiments performed confirm that observed fusion rate enhancement with a negatively biased target is primarily due to changes to the fusion cross section, rather than simply acceleration due …

等离子体边缘中性粒子流的多尺度模拟

Multiscale simulation of neutral particle flows in the plasma edge

本文提出一种通用综合迭代方案，通过交替求解动理学方程与宏观综合方程，高效且高精度地模拟了近连续流条件下的等离子体边缘中性粒子流，为核聚变装置设计提供了稳健的计算工具。

等离子体模拟中中性粒子动力学的加速求解器

Accelerated Solvers for Neutral Particle Dynamics in Plasma Simulation

本文提出在GBS代码中采用层次矩阵近似加速托卡马克边界中性粒子动力学求解，实现计算时间与内存降低90%以上，并支持更高空间分辨率模拟。

Natural Fueling of a Tokamak Fusion Reactor

A natural fueling mechanism that helps to maintain the main core deuterium and tritium (DT) density profiles in a tokamak fusion reactor is discussed. In H-mode plasmas dominated by ion- temperature gradient (ITG) driven turbulence, cold DT ions near the edge will naturally pinch radially inward towards the core. This mechanism is due to the quasi-neutral heat flux dominated nature of ITG turbulence and still applies when trapped and passing kinetic electron effects are included. Fueling using shallow pellet injection or supersonic gas jets is augmented by an inward pinch of could DT fuel. The…

Development of multi-platform control and instrumentation communications to increase operational reliability - application to MAST

Improving the reliability and reducing the maintenance time to give increased availability is a key feature of developing control & instrumentation (C&I) systems relevant to future fusion devices such as DEMO and to fusion power plants. Standardising access to the multiple platforms comprising C&I systems on working plant including software that analyses data is one aspect of achieving this. This has been realised on the MAST Neutral Beam Injection system (MNBI) following an extensive upgrade to the C&I, to improve the operational reliability of the neutral beam plant.