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The influence of collector plasma has been investigated for an L-band magnetically insulated line oscillator (MILO) with metal array cathode (MAC), which showed obvious performance degradation after 3000 shots in repetitive mode. Positive ion emission model is applied to simulate plasma generation from the collector surface. Different types of positive ions have been applied to simulate different collector materials. The simulation results reveal that the collector plasma has a significant influence on the output characteristics of the original MAC-MILO. The ladder cathode structure is introduced to reduce plasma formation rate on the collector surface. The simulation and experimental results show that the optimized structure reduces the influence of collector plasma successfully. more...
A Compact Double-Exponential Current Generator Based on the Cage Cavity Consisted of Multisteel Rodsby Hanyu Wu, Xinjun Zhang, Weixi Luo, Mo Li, Jinhai Zhang, and Shaoguo Zhang
We describe a current generator which consists of the Marx, the current-limited resistors, and the output port and can produce a double-exponential current waveform with the 3 kA, the rise time 10 ns, the pulsewidth 100 ns following the requirement of the IEC 61000-4-25 standard, while the effective impedance of the tested systems does not exceed 2 Ω . A new cavity of Marx is constructed by 12 steel rods which help assembly work more convenient; moreover, the current waveform has less disturbed signal. Because of using the cavity, the charging, trigger, and grounded circuits can be installed out of the Marx. Meanwhile, the cantilever insulated support of Marx also is used. The methods above can help make a compact current generator with a low inductance which can be beneficial to research the electromagnetic coupling laws of system circuit ports and chips. more...
The plasma effects of energetic electron bombardment on component materials severely limit the output pulsed energies of high-power microwave (HPM) sources. This paper proposes a feasible method for choosing materials for beam collectors in HPM devices. First, electron energy deposition in metal materials is theoretically and numerically investigated. Considering the energy threshold resulting in material ablation, the resilience of several metals to intense relativistic electron beam (IREB) bombardment is compared. This resilience is mainly determined by the material density and melting point. Titanium shows good resilience compared with stainless steel, copper, molybdenum, and tungsten. With an incident 780 keV, 9.5-kA IREB, the maximum deposition energy in titanium just slightly exceeds its ablation threshold. Thus, the theoretical results indicate that titanium is a promising material for application in HPM devices. The experimental results validate the theoretical analyses. Compared with the conventional stainless steel collector, the titanium collector has better stability and lifetime. We intend to investigate more materials in future studies. more...
A PUBLICATION OF THE IEEE NUCLEAR AND PLASMA SCIENCES SOCIETY
|FEBRUARY 2018 | VOLUME 46 | NUMBER 2 | ITPSBD | (ISSN 0093-3813)|
|PART I OF TWO PARTS
SPECIAL ISSUE ON MICROPROPULSION AND CUBESATS
SPECIAL ISSUE PAPERS
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