Experimental Demonstration of Compact S-Band MW-Level Metamaterial-Inspired Klystron
Xin Wang, Xuanming Zhang, Jianjun Zou, Shaozhe Wang, Junjie Huang, Shifeng Li, Yongming Li, Yurong Liu, Min Hu, Yubin Gong, Edl Schamiloglu, B. N. Basu, Zhaoyun Duan
Abstract
Metamaterials are artificially constructed subwavelength structures exhibiting unprecedented electromagnetic phenomena. In this letter, an S-band MW-level metamaterial-inspired klystron using all-metal complementary electric split ring resonators (CeSRRs) was realized in the experiment. The CeSRR-loaded interaction structure of the klystron developed here features a miniaturized structure, the volume of which is only about 0.44 of the conventional counterparts. The metamaterial-inspired klystron based on the interaction structure loaded with CeSRRs was designed, fabricated and assembled. Using a pencil beam with parameters of 120 kV/80 A in the hot-test, the klystron delivered the biggest output power of 5.51 MW with gain of 55.6 dB and electronic efficiency of 57.4% at 2.852 GHz. This compact metamaterial-inspired klystron has potential applications in proton therapy facilities, tokamaks for the low-hybrid wave heating, and accelerators.