{"title":"Preliminary numerical study on thermal impact of runaway electrons to limiter PFU in fusion reactor","authors":"Siyao Wang , Xinyuan Qian , Xuebing Peng","doi":"10.1016/j.nme.2025.101979","DOIUrl":null,"url":null,"abstract":"<div><div>Runaway electrons (RE) generated during unmitigated Major Disruptions (MDs) pose a significant threat to Plasma-Facing Components (PFCs) in fusion reactor. The highly energetic RE retain a large fraction of the plasma’s magnetic energy, and can penetrate the First Wall (FW), potentially damaging internal structures, even causing coolant leakage accidents. Understanding the interaction and damage mechanism between RE and FW will help design FW to resist RE impact. In this study, numerical simulations are conducted to investigate the thermal impact of RE on the FW of limiter based on thickened Monoblock structure under fusion reactor conditions, with particular focus on component damage in the RE beam peak region and the factors affecting the RE beam energy deposition. The results indicate that current plasma-facing units (PFUs) of limiter is highly susceptible to damage under the impact of runaway electron beam in fusion reactors. Nevertheless, by controlling the angle between the FW and the magnetic field lines and reducing the energy of the RE beam, the extent of damage to the limiter can be effectively controlled.</div></div>","PeriodicalId":56004,"journal":{"name":"Nuclear Materials and Energy","volume":"44 ","pages":"Article 101979"},"PeriodicalIF":2.7000,"publicationDate":"2025-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Nuclear Materials and Energy","FirstCategoryId":"101","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2352179125001218","RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"NUCLEAR SCIENCE & TECHNOLOGY","Score":null,"Total":0}
引用次数: 0
Abstract
Runaway electrons (RE) generated during unmitigated Major Disruptions (MDs) pose a significant threat to Plasma-Facing Components (PFCs) in fusion reactor. The highly energetic RE retain a large fraction of the plasma’s magnetic energy, and can penetrate the First Wall (FW), potentially damaging internal structures, even causing coolant leakage accidents. Understanding the interaction and damage mechanism between RE and FW will help design FW to resist RE impact. In this study, numerical simulations are conducted to investigate the thermal impact of RE on the FW of limiter based on thickened Monoblock structure under fusion reactor conditions, with particular focus on component damage in the RE beam peak region and the factors affecting the RE beam energy deposition. The results indicate that current plasma-facing units (PFUs) of limiter is highly susceptible to damage under the impact of runaway electron beam in fusion reactors. Nevertheless, by controlling the angle between the FW and the magnetic field lines and reducing the energy of the RE beam, the extent of damage to the limiter can be effectively controlled.
期刊介绍:
The open-access journal Nuclear Materials and Energy is devoted to the growing field of research for material application in the production of nuclear energy. Nuclear Materials and Energy publishes original research articles of up to 6 pages in length.