Abstract
In order to develop an extended interaction klystron (EIK) with high performance in the terahertz range, the staggered-tuned structure is numerically studied, manufactured, and measured. First, the circuit is optimized to get high interaction strength and avoid the mode overlapping in the output cavity, ensuring the efficiency and stability for the device. Then the clustered cavities are staggered tuned to improve its bandwidth. The particle-in-cell (PIC) code is employed to research the performances of the device under different conditions and accordingly the practicable and reliable conditions are confirmed. The device can effectively amplify the input terahertz signal and its gain reaches around 19.6 dB when the working current is 150 mA. The circuit and window are fabricated and tested, whose results demonstrate their usability. The experiment on the beam’s transmission is conducted and the results show that about 92% of the emitting current can successfully arrive at the collector, ensuring the validity and feasibility for the interaction process.
Highlights
Terahertz (THz) wave, locating between the microwave and far infrared wave in the electromagnetic spectrum, has a lot of particular characteristics[1,2] and shows great advantages in the applications of spectroscopy, imaging, material detection, and communications.[3,4,5,6,7] Due to its potential applications, the terahertz technology has attracted lots of attentions and has been rapidly developed in recent years
For some THz applications, the radiation source above 0.3THz with considerable output power is rather needed, which has not been well achieved at present.[8]
A lot of progress has been made in the research of extended interaction klystron (EIK) and its related technology, including the design of advanced interaction circuit,[15,16] the introduction of novel theoretical tool in analyzing resonator’s performance[17] and the development of micro-fabrication with high precision,[18] which all enable the breakthrough in the EIK in the subterahertz range
Summary
Terahertz (THz) wave, locating between the microwave and far infrared wave in the electromagnetic spectrum, has a lot of particular characteristics[1,2] and shows great advantages in the applications of spectroscopy, imaging, material detection, and communications.[3,4,5,6,7] Due to its potential applications, the terahertz technology has attracted lots of attentions and has been rapidly developed in recent years. The operation mode in the multi-gap cavity is studied by introducing the approach of interaction functions to evaluate all the longitudinal modes. The effects of electric field at the gap from different resonance modes on the electron beam are theoretically compared and the longitudinal mode of 2π is chosen due to its strongest interaction strength. Based on the configuration of the multi-gap cavity, the structure of clustered cavities is optimized to be staggered-tuned[22] to improve the bandwidth of the device. The sub-system in the EIK, including the circuit, the window and the electron gun, are carefully manufactured and tested, which are the basis to the hot-test of device.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
