Article
Physics, Fluids & Plasmas
Y. Y. Lau, Drew A. Packard, Christopher J. Swenson, John W. Luginsland, Dion Li, Abhijit Jassem, Nicholas M. Jordan, Ryan D. McBride, Ronald M. Gilgenbach
Summary: This article re-evaluates Brillouin flow solutions in crossed-field diodes, exploring various geometries and applications while highlighting the equivalence of two main parameters and correcting misconceptions about the relationship between electron flow and magnetic insulation. This analysis provides useful scaling laws applicable in both relativistic and nonrelativistic regimes, revealing contrasts between magnetrons and MILOs and guiding the potential development of hybrid devices.
IEEE TRANSACTIONS ON PLASMA SCIENCE
(2021)
Article
Engineering, Electrical & Electronic
Xiaoyu Wang, Zeyang Liu, Baoping Yang, Wenqiang Xu, Ting Shu, Yuwei Fan, Bing Han
Summary: In this study, the frequency tunability of a magnetically insulated transmission line oscillator (MILO) was investigated through simulation and experiment. The simulation results showed that the tunable MILO achieved a maximum output power of 5.0 GW at a voltage of 590 kV and an input power of 29 GW, with a power efficiency of 17.2% and a frequency of 1.575 GHz. By adjusting the outer radius of the vane, the 3-dB tunable frequency of the MILO ranged from 0.85 GHz to 2.12 GHz, with a tuning bandwidth of 85.5%. Experimental measurements confirmed the simulation results, showing a peak microwave power of 2.3 GW and a microwave frequency of 1.900 GHz for the tunable MILO.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Engineering, Electrical & Electronic
Xiaoyu Wang, Yuwei Fan, Ting Shu, Baoping Yang, Xu Xu, Ankun Li, Zeyang Liu, Haodong Xu
Summary: The experimental results demonstrate that incorporating ridged disk vanes in a magnetically insulated transmission line oscillator (RMILO) results in higher power efficiency and microwave power output compared to a conventional MILO (CMILO) under the same conditions. The RMILO outperforms the CMILO in terms of power efficiency and microwave power output at high voltage and current levels.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2021)
Article
Engineering, Electrical & Electronic
Mohit Kumar Singh, Pradip Kumar Jain, Manpuran Mahto
Summary: In this article, a dual-band magnetically insulated line oscillator (DBMILO) incorporated with ridged disk-loaded vanes is examined to improve the interaction efficiency. Cold and hot simulations were carried out to investigate the impact of ridged slow wave-structure (RSWS) on the electromagnetic (EM) characteristics of the DBMILO. CST particle-in-cell (PIC) simulation was used to evaluate the RF performance of the DBMILO. The results showed that the ridged DBMILO (RDBMILO) achieved a peak RF power of 4.6 GW at frequencies of 3.30 and 9.85 GHz, with a peak power conversion efficiency of approximately 16.4%. Compared to the conventional DBMILO (CDBMILO), the RDBMILO demonstrated a 28% enhancement in both RF power and efficiency.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Physics, Fluids & Plasmas
Mohit Kumar Singh, V. Sivavenkateswara Rao, Manpuran Mahto, Pradip Kumar Jain
Summary: This article presents an axially partitioned magnetically insulated line oscillator (MILO) to generate high-power microwave (HPM) with two frequencies in different bands. The electromagnetic characteristics of the dual band MILO (DBMILO) are investigated and analyzed through particle-in-cell (PIC) simulation. The proposed design operates in S- and X-bands and achieves high peak RF power and power conversion efficiency.
IEEE TRANSACTIONS ON PLASMA SCIENCE
(2022)
Article
Optics
Hanyu Ye, Lilia Pontagnier, Eric Cormier, Giorgio Santarelli
Summary: We propose and demonstrate a non-mode-locking approach to generating multi-gigahertz repetition rate, femtosecond pulses in burst mode by shaping a continuous-wave (CW) seed laser in an all-fiber configuration. The system eliminates the need for mode-locked cavities and simplifies conventional ultrafast electro-optic combs to using only one phase modulator, while providing femtosecond pulses at multiple gigahertz repetition rate, enhanced pulse energy in burst mode and the potential of further power/energy scaling.
Article
Engineering, Electrical & Electronic
Mohit Kumar Sing, Manpuran Mahto, Pradip Kumar Jain
Summary: In this article, the authors investigate the electromagnetic characteristics and performance improvement of a bifrequency magnetically insulated line oscillator with ridge-disk-loaded vanes. The results show that the ridge structure significantly enhances the coupling impedance and power efficiency of the oscillator. Simulation results provide insights into the RF performance of the device under specific operating conditions.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2022)
Article
Physics, Fluids & Plasmas
Nisheeth Upadhyay, Arjun Kumar, Prabhakar Tripathi, Smrity Dwivedi
Summary: In this study, the electromagnetic analysis of a partially dielectrically filled periodic disk-loaded co-axial structure as a slow wave interaction structure for magnetically insulated transmission line oscillator (MILO) was conducted using field matching technique. The effect of dielectric constant on dispersion characteristics and phase velocity, as well as the impact of structural parameters on dispersion characteristics and interaction impedance, were investigated. The theoretical analysis was validated by comparing the results with known dispersion results and simulations, showing an agreement within 5% in terms of dispersion characteristics.
IEEE TRANSACTIONS ON PLASMA SCIENCE
(2022)
Article
Physics, Fluids & Plasmas
Ryan A. Revolinsky, Emma N. Guerin, Stephen V. Langellotti, Christopher J. Swenson, Levi I. Welch, Drew A. Packard, Nicholas M. Jordan, Y. Y. Lau, Ronald M. Gilgenbach
Summary: Magnetically insulated line oscillators (MILOs) generate a self-induced azimuthal magnetic field via an axial current, eliminating the need for external magnets. This article presents the design, simulation, and experimental demonstration of a dual-frequency, harmonic MILO (HMILO) composed of sequential slow wave structures (SWSs) tuned for oscillation at different frequencies.
IEEE TRANSACTIONS ON PLASMA SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Georgia Paraskaki, Sven Ackermann, Bart Faatz, Gianluca Geloni, Tino Lang, Fabian Pannek, Lucas Schaper, Johann Zemella
Summary: Current FEL development efforts are focused on improving coherence control at high repetition rates while maintaining wavelength tunability. Introducing optical cavities to seed electron bunches and modulate their energy is a unique approach discussed to enhance FEL brightness and statistical data collection.
APPLIED SCIENCES-BASEL
(2021)
Article
Engineering, Electrical & Electronic
Mohit Kumar Singh, Manpuran Mahto, Pradip Kumar Jain
Summary: This article presents the performance enhancement of a dual-band magnetically insulated line oscillator (DBMILO) using a modulation cavity. The impact of the modulation cavity on the transmission characteristics and operating frequency of the modified DBMILO are investigated through electromagnetic (EM) simulation. The RF behavior of the proposed and conventional design is examined through the particle-in-cell (PIC) solver code. Compared to the conventional DBMILO, the power efficiency of DBMILO with modulation cavity enhances by 33%.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Optics
Mariastefania de Vido, P. Jonathan Phillips, David Meissner, Stephanie Meissner, Gary Quinn, Saumyabrata Banerjee, Martin Divoky, Paul D. Mason
Summary: This study reports the successful amplification of 10 ns pulses to 10 J energy at 10 Hz using Yb:YAG/Cr:YAG composite slabs manufactured with adhesive-free bonding (AFB) technology. It also demonstrates frequency doubling of the amplified beam in the bonded slabs. The results indicate that AFB technology is suitable for producing large-sized gain material slabs and can overcome limitations in manufacturing large-aperture gain material pieces.
Article
Physics, Multidisciplinary
Gong Zhen-Zhou, Wei Hao, Fan Si-Yuan, Sun Feng-Ju, Wu Han-Yu, Qiu Ai-Ci
Summary: This paper develops a transmission line circuit model for a magnetically insulated transmission line (MITL) system and analyzes the current loss characteristics and ion emission of multi-level MITL. The study provides insights into the spatiotemporal distribution of current loss and ion current in different regions, as well as the characteristics of electron emission.
ACTA PHYSICA SINICA
(2022)
Article
Optics
Hongling Chen, Peixiong Zhang, Jiawan Song, Hao Yin, Yin Hang, Qiguo Yang, Zhen Li, Zhenqiang Chen
Summary: The introduction of Gd3+ ions in the novel Nd:CaY0.9Gd0.1AlO4 mixed crystal broadened its emission band and enabled successful diode-pump tunable laser operation. This development is significant for the further advancement of near-infrared tunable lasers.
Article
Physics, Multidisciplinary
Zhen-Zhou Gong, Hao Wei, Si-Yuan Fan, Ya-Ping Hong, Han-Yu Wu, Ai-Ci Qiu
Summary: This article mainly discusses the design and parameters of the magnetically-insulated transmission-line (MITL) system in the 15-MA driver and their influence on current transmission and convergence. Through calculation and establishing an equivalent circuit model, the study shows that the impedance at the end of the outer-MITL has a significant effect on the current, with an increase in impedance leading to a decrease in current. Additionally, the minimum gap of the outer-MITL and the radius of the PHC location also have an influence on the current.
ACTA PHYSICA SINICA
(2023)
Article
Instruments & Instrumentation
Xiao Liu, Song Li, Wei Peng, Jingming Gao, Hanwu Yang
Summary: The study investigated a compact low impedance Blumlein-type PFN based on ceramic capacitors and demonstrated its ability to generate high power pulses with theoretical performance achieved on a matched dummy load. Experiments showed good agreement with numerical analysis, validating the effectiveness of the design.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2021)
Article
Engineering, Electrical & Electronic
Xu Chu, Jinliang Liu, Tao Xun, Langning Wang, Hanwu Yang, Juntao He, Jun Zhang
Summary: This study presents an ultrahigh repetition frequency sub-nanosecond pulse generator based on vanadium-compensated semi-insulating 4H-SiC photoconductive semiconductor switch (PCSS). The PCSS showed excellent response performance and improved light absorption efficiency, which is significant for high-power switching in bulk semi-insulating 4H-SiC.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2022)
Article
Instruments & Instrumentation
Hao Lu, Motao Zhang, Hanwu Yang, Huibo Zhang, Zicheng Zhang, Jingming Gao
Summary: This paper presents a pulse forming technology based on metal oxide varistors (MOVs) to generate high-voltage quasi-square pulses. Two solutions are proposed to reduce the influence of the MOV branch inductance on the output waveforms. A high-voltage, long-pulse width, flat-top compensation pulse generator is designed and tested, demonstrating the feasibility of this MOV-based generator for various applications.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2022)
Article
Computer Science, Information Systems
Hanwu Yang, Zicheng Zhang, Jingming Gao, Tao Xun, Song Li
Summary: A low impedance high power microwave (HPM) driver has been designed for studying multi-gigawatt HPM devices. The driver improves the reliability of the system by optimizing the combination of PFL charging voltage and output switch working voltage. It increases the load voltage using a Tesla transformer and a transmission line.
Article
Engineering, Electrical & Electronic
Xu Chu, Tao Xun, Langning Wang, Liang Xu, Hanwu Yang, Jinliang Liu
Summary: The use of vanadium-compensated semi-insulating 4H-SiC photoconductive semiconductor switch for generating tunable ultra-wideband microwaves has been demonstrated. Experimental results show that the fabricated 4H-SiC PCSS can operate at high electric fields and photocurrents, and the generated ultra-wideband microwave pulses have a wide range of repetition frequencies. Simulations were conducted to examine the radiation field of the UWB antenna system, which showed a high peak radiation electric-field factor.
ELECTRONICS LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Langning Wang, Xu Chu, Muyu Yi, Jinmei Yao, Tao Xun, Hanwu Yang
Summary: The SiC vertical photoconductive switch with an axial optical internal reflection trap improves the ON-state performance significantly by increasing both the light absorption and output current. The structure with the reflective trapping arrangement demonstrates a 2.5x improvement in photoelectric conversion responsivity compared to regular axial illumination.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2022)
Article
Engineering, Multidisciplinary
Song Li, Peng Fan, Jingming Gao, Hanwu Yang, Dongqun Chen, Baoliang Qian
Summary: This article describes a compact and repetitive high-power pulse generator that can be used for high voltage applications such as high power microwave and low temperature plasma. Stray resistances affecting the generator's performance are discussed and optimized numerically. The high-power pulse generator has been successfully built in the laboratory, delivering stable output on a capacitive load and demonstrating its effectiveness for high voltage applications.
INSTRUMENTS AND EXPERIMENTAL TECHNIQUES
(2022)
Article
Instruments & Instrumentation
Zicheng Zhang, Shifei Liu, Hanwu Yang, Diangeng Li, Yuwei Fan, Jiande Zhang
Summary: This paper presents the development of a compact high energy-density electron beam accelerator HEART-20, based on a pulse transformer and a pulse forming line of high permittivity liquid. The operational principle, parameter design, and energy storage characteristics of this accelerator are described. The results show that HEART-20 can operate steadily at a 20 GW output power and has potential applications in high-frequency and high-power electron beam accelerators.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2022)
Article
Nanoscience & Nanotechnology
Wentao Fu, Langning Wang, Bin Wang, Xu Chu, Tao Xun, Hanwu Yang
Summary: Vanadium-compensated semi-insulating 4H-SiC photoconductive semiconductor switch (PCSS) is a promising candidate for frequency-agile microwave generation. However, in our experiment, we found a long tail of photocurrent caused by an uninvestigated hole trap.
Article
Engineering, Electrical & Electronic
Peng Zhang, Xingjun Ge, Fangchao Dang, Hang Chi, Hanwu Yang, Juntao He
Summary: This article investigates a sub-microsecond compact L-band relativistic Cherenkov oscillator, which achieves high-power microwave output with the highest reported pulsewidth and single pulse energy levels.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2022)
Article
Instruments & Instrumentation
Jingming Gao, Song Li, Hanwu Yang, Shangdong Jin, Fanzheng Zeng, Baoliang Qian, Chengwei Yuan
Summary: In this paper, a novel compact solid-state high power pulse generator is studied, both numerically and experimentally. Experimental results show that pulses with a peak power of 2 GW, a duration of 150 ns, and a repetitive rate of 10 Hz are continuously achieved on a dummy load. The dimension is phi 60 x 210 cm(2), and the average power density reaches & SIM;5 W/L. Experimental results show reasonable agreement with numerical analysis.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2023)
Article
Engineering, Electrical & Electronic
Xinyue Niu, Qilin Wu, Bin Wang, Jinmei Yao, Xu Chu, Muyu Yi, Yanran Gu, Langning Wang, Tao Xun, Hanwu Yang
Summary: This paper presents the design scheme and preliminary test results of a narrowband kW class adaptive photonic microwave generator using a wide-bandgap semi-insulating 6H-SiC photoconductive semiconductor and a burst-mode laser. The laser modulates the frequencies of the generated microwave, and preliminary tests are conducted in the frequency range of 0.8-1.2 GHz. The maximum output microwave power of the designed scheme reaches up to 2.6 kW when the bias voltage is 10 kV.
IEEE PHOTONICS JOURNAL
(2023)
Article
Chemistry, Physical
Yang Yang, Zhangfeng Shen, Hanwu Yang, Xuhui Zou, Yuxiao Meng, Lingchang Jiang, Yanan Liu, Qineng Xia, Yongyong Cao, Xi Li, Jing Gao, Yangang Wang
Summary: A bifunctional material, consisting of Pd-Cu alloy nanocrystals on carbon oxygen co-doped BN, was fabricated to capture and photocatalytically reduce CO2. The CO2 was adsorbed in the form of bicarbonate on the surface of elemental doped BN, and the CO2 molecules were converted to CO at the interfaces of BN and Pd-Cu alloys. The uniform distribution of smaller Pd-Cu nanocrystals on BN created more effective interfaces and led to a higher CO production rate.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Physics, Fluids & Plasmas
Huibo Zhang, Quan Zhou, Hanwu Yang, Jingmin Gao, Zicheng Zhang, Xingjun Ge
Summary: A high-energy-density Marx generator with a modified waveform is designed in this article, and the experimental results show that it can generate quasi-square pulses with a voltage amplitude exceeding 500 kV and a pulsewidth of 1 μs. Further experimental research demonstrates that the Marx generator can be used to produce a relativistic electron beam with an energy of 550 keV and a current of 8.3 kA.
IEEE TRANSACTIONS ON PLASMA SCIENCE
(2022)
Article
Engineering, Electrical & Electronic
Xu Chu, Tao Xun, Langning Wang, Hanwu Yang, Jinliang Liu, Juntao He, Jun Zhang
Summary: This letter examines a frequency-agile microwave generating system that utilizes a vanadium-compensated semi-insulation 4H-SiC photoconductive semiconductor switch to achieve wide-range frequency tuning. Both simulation and experimental results demonstrate a broad tuning range and higher output power.
IEEE ELECTRON DEVICE LETTERS
(2022)