题目：Remote detection of excess ionizing radiation by using focused powerful terahertz wave beams

报告人：Gregory S. Nusinovich教授，美国马里兰大学电子与应用物理研究所

时间：2020年10月29日（周四）下午19:00

地点：Skype会议

报告摘要

A high-power source of sub-THz radiation allows one to remotely focus this radiation in a small volume where the RF electric field will concealed radioactive materials as a new application of gyrotrons.

In this lecture, I am planning to start by describing the concept of remote detection of excess ionizing radiation by using high-power gyrotrons and some experiments with the 200kW, 0.67 THz Gyrotron. Then, I will focus on the working conditions of remote detection: formation of the breakdown-prone volume, production of free electrons by gamma rays and minimum detectable mass. Next step will be atmospheric conditions on the propagation and focusing of THz wave beams. The last part of this lecture will be devoted to plasma formation.

参考文献：

[1] V. L. Granatstein and G. S. Nusinovich, “Detecting excess ionizing radiation by electromagnetic breakdown of air”, Journal of Applied Physics, vol.108, no.6, pp.084702198, 2010, doi:10.1063/1.3484044.

[2] G. S. Nusinovich， “Remote Detection of Concealed Radioactive Materials by Using Focused Powerful Terahertz Radiation”, Journal of Infrared, Millimeter, and Terahertz Waves, vol.37, no.6, pp.515535,2016.

报告人简介

Gregory S. Nusinovich，回旋管领域顶尖专家，回旋管理论奠基人之一，IEEE fellow，美国物理学会fellow。曾担任前苏联回旋管专家组负责人，1995年至今在美国马里兰大学电子与应用物理研究所任高级研究员。在过去的研究中，为回旋管的发展做出了许多贡献：所在团队最早计算了回旋管的非线性互作用效率；完善了回旋管归一化理论；分析并解释了回旋管中的模式竞争过程等；曾获Kenneth J. Button Prize，“对太赫兹频段范围的回旋管振荡器和放大器的理论和发展做出重要贡献”；参与编写了20余本微波真空电子器件相关著作，其主编的“Introduction to the physics of gyrotron”是许多学者研究回旋管理论的重要参考。已发表了250多篇期刊论文及300多篇会议论文，其中包含5篇Physical Review Letter以及多篇期刊邀请综述文章，论文被引用超过3000次，H因子37，并受邀在国际会议及研究机构上发表了超过80次演讲。