**About the Editors**

## **Jinjun Feng**

Jinjun Feng received the Bachelor Degree from Tsinghua University, Beijing, and the Master and Ph.D Degree from Beijing Vacuum Electronics Research Institute (BVERI). He has been with BVERI since 1990 and engaged in the research and development of millimeter wave space TWTs, W-Band TWTs and higher frequency devices using micro-fabrication, gyrotrons, field emission devices, cesium beam tubes etc. He is currently the Vice General-Director of BVERI. Dr Feng was the TPC Chair of the IVEC2015 in Beijing. He was a TPC Co-Chair of the 8th U.K., Europe, China Millimeter Waves and Terahertz Technology Workshop (UCMMT) in Cardiff, UK in 2015 and a General Co-Chair of the 9th UCMMT, in Tsingdao, China in 2016. He is a Fellow of Chinese Institute of Electronics (CIE), a Fellow of Institute of Engineer and Technology (IET), UK. He has been a member of IEEE EDS Vacuum Electronics Technical Committee since 2010. He was Chair of IEEE EDS Beijing Chapter (2011-2012) and Chair of IEEE Beijing Section (2014-2015), and is currently the Chair of IEEE China Council since 2016. He received the IEEE EDS John R. Pierce Award for Excellence in Vacuum Electronics in 2019.

## **Yubin Gong**

Yubin Gong was born in Yantai, Shandong Province of China. He received his bachelor's degree in applied optics from Changchun University of Science and Technology in 1989, and his master's degree and philosophy doctor's degree in physical electronics from University of Electronic Science and Technology of China in 1991 and 1998, respectively. In 1991, he joined the Institute of High Energy Electronics, University of Electronic Science and Technology of China, and engaged in teaching and scientific research in the field of vacuum electronics. Now he is an outstanding professor in the School of Electronic Science and Engineering, University of Electronic Science and Technology of China, director of Chengdu Branch of National Key Laboratory of Microwave Vacuum Electronics, and leader of a vacuum electronics innovation research group. His research interests include high-power millimeter-wave and terahertz wave vacuum electron devices and their applications, terahertz devices combining vacuum and solid-state electronics, terahertz electromagnetic biological effects, and vortex electromagnetic wave biomedical imaging. He has published more than 400 academic papers, and has been invited to give more than 30 presentations at academic conferences. He has won the second-class prize of National Technical Invention and the first prize of Science and Technology Progress in Sichuan Province.

### **Chaohai Du**

Chao-Hai Du (Senior Member, IEEE) received a B.S. degree in electronics from the University of Electronic Science and Technology of China, Chengdu, China, in 2005 and a Ph.D. degree in physical electronics from the University of Chinese Academy of Sciences, Beijing, China, in 2010. He is currently a Research Professor with Peking University, Beijing, China.

#### **Adrian Cross**

Adrian W. Cross was born in Hanover Germany in 1966. He received his B.Sc. degree (with honors) in physics and his Ph.D. degree from the University of Strathclyde, Glasgow, U.K., in 1989 and 1993, respectively. He joined the Atoms, Beams, and Plasmas Group, University of Strathclyde, in 1993 initially as a Research Fellow and then as a Lecturer in 2000, Senior Lecturer in 2003, Reader in 2006 and was promoted to Professor in 2014 with the Department of Physics, University of Strathclyde. From 2002 to 2007, he was an Engineering and Physical Science (EPSRC) UK Advanced Fellow and has been group leader since 2014. He has been involved in various aspects of research on gyrotrons, cyclotron autoresonance masers, free-electron lasers, superradiant sources, gyrotron travelling wave amplifiers, microwave pulse compression and plasma applications. More recently, he has primarily been concerned with research on THz radiation sources and pseudospark physics.
