11月21日 Diagnostic mirrors: research and challenges

　　题目：Diagnostic mirrors: research and challenges

　　报告人：Dr. Andrey Litnovsky

　　主持人：鄢容 研究员

　　时间：2024年11月21日（星期四）下午14:00-15:30

　　地点：六室三楼301会议室

　　摘要：Diagnostic mirrors are critical components in ITER, serving as the primary plasma-viewing elements for optical and laser-based diagnostic systems. These mirrors are integral to nearly 50% of ITER's diagnostic capabilities. Among them, the mirrors directly exposed to the plasma, known as first mirrors (FMs), play a pivotal role in ensuring the reliability of optical diagnostics.

　　However, due to their direct exposure to the plasma and the extreme operational environment of ITER, FMs face significant challenges, including particle bombardment and impurity deposition. These processes lead to rapid degradation of their optical performance, resulting in reduced service life and compromised diagnostic accuracy. Such deterioration not only affects the functionality of individual diagnostic systems but also poses risks to the overall operational safety and performance of the facility.

　　To address these critical challenges, it is essential to implement strategies that preserve the optical characteristics of FMs throughout the lifetime of ITER. This report examines the harsh environmental conditions encountered by FMs, identifies the key issues affecting their performance, and highlights the measures developed to mitigate these challenges, ensuring the sustained reliability of optical diagnostics in ITER.

　　报告人简介：

　　Andrey Litnovsky, who got Ph.D degree in Moscow State Engineering and Physics Institute (MEPhI) in 2001, being a scientist at Forschungszentrum Jülich GmbH since 2004. He served as a Multi-Machine Coordinator/expert on the first mirrors investigations in the frame of the International Energy Agency (IEA) and the International Tokamak Physics Activity (ITPA) Joint Experiments Program. He is the Chairman of the Specialists Working Group on First Mirrors of ITPA Topical Groupon Diagnostics and undertook the leadership of several fusion research projects.

　　His research interests includes material research, surface physics and plasma physics and diagnostics. He has published more than 160 journal papers with an H-index of 37 in Google Scholar attracting 375 citations in 2022. He contributed more than 20 invited talks at international conference and meetings, gave several lectures in Oxford University, HFUT, MEPhI, and chaired several funds.