基于氢等离子体驱动液态锂-铁基底双层膜渗透行为研究OA北大核心

Liquid lithium is widely utilized in nuclear fusion reactors due to its exceptional self-healing capabil-ity,high neutron absorption efficiency,chemical stability,and tritium breeding potential.These characteris-tics have made liquid lithium play a key role in multiple fusion facilities such as NSTX,EAST,and FTU,particularly in plasma environments.Hydrogen isotopes,as the main materials for fusion reactions,highlight the challenges that exist in liquid lithium technology.Despite the phased achievements of liquid lithium in fu-sion devices,the issue of fuel particle retention in the plasma environment has not yet been resolved.In liquid lithium and lithium-lead alloys,the solubility of hydrogen and its isotopes is very low,and it is difficult to measure accurately,with significant discrepancies in the literature regarding their permeation and diffusion data.Therefore,real-time monitoring of tritium concentration in liquid metals is crucial for the development and optimization of tritium extraction,removal,and recovery processes,which is also the core of verifying tritium self-sufficiency.Currently,research on hydrogen isotope content in liquid lithium is relatively limited,with most studies focusing on the retention and recovery of deuterium and tritium in liquid metal blankets in fusion devices.This research emphasis reflects the urgent need for precise monitoring of tritium inventory and its recovery,especially when dealing with liquid lithium and lithium-lead alloys.There are two mainstream methods for monitoring hydrogen and its isotopes in liquid lithium-lead:one is the permeation membrane method,which involves contacting liquid lithium-lead with a metal membrane that has strong hydrogen per-meability,while maintaining a vacuum on the other side to allow hydrogen and its isotopes in the liquid lithium-lead to permeate through the permeation membrane.The other method is the proton conduction method,which is based on electrochemical principles.The liquid lithium-lead and the detection probe are separated by an electrolyte that can conduct hydrogen ions,forming an electrochemical circuit between the probe and the liquid lithium-lead.By measuring the potential difference between the two ends,the hydrogen concentration in the liquid lithium-lead can be obtained through the Nernst equation.This paper aims to ex-plore the hydrogen permeation flux in liquid Li/Fe under plasma conditions by using the permeation technol-ogy of a Li/Fe double-layer membrane and to build a plasma-driven permeation model based on the Li/Fe double-layer permeation membrane.The study further analyzes how different hydrogen gas pressures,experi-mental temperatures,and radio frequency power input by inductively coupled plasma,as well as material thickness,affect the measurement results of hydrogen gas flux through the Fe membrane permeation window.Additionally,the experiment explores the diffusion behavior of hydrogen in the double-layer permeation struc-ture Li/Fe and successfully calculates the diffusion coefficient formula for hydrogen atoms under these plasma-driven conditions.Through these studies,new methods and data support have been provided for the precise measurement and control of hydrogen isotope concentrations in liquid lithium,which in turn helps to optimize the design and operation of liquid wall materials or liquid baffles,and improve the recovery efficiency of tri-tium and the safety of the reactor.