碘LaB6空心阴极的振荡

IF 3.9 2区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Xin Li , Tianhang Meng , Zhongxi Ning , Hui Liu , Chao Sun , Yang Liu , Stepan I. Eliseev , Daren Yu
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引用次数: 0

摘要

近年来,碘供电推进系统取得了重大的技术进步,但这些系统的工作范围仍然受到安培级碘兼容空心阴极技术的基本限制。通过对LaB6空心阴极放电特性的初步研究,发现它是一种很有潜力的阴极材料。在本研究中,设计了一种传统的抗碘材料LaB6空心阴极,并在碘相容真空装置中进行了测试。得到了碘空心阴极的波形、双谱特性和色散关系,并与估计的碰撞反应频率进行了比较。我们分析了阴极内外的潜在反应过程,并评估了振荡对碘空心阴极寿命的影响。结果表明,混沌低频振荡是影响碘阴极性能的主要振荡模式,涉及多个相互干扰的反应过程。阴极内部的振荡主要受振动激发和碘分子电离的影响,而阴极外部的振荡主要受中性气体流动、激发、电离、解离和离子跃迁时间不稳定性等过程的影响。碘阴极的整体振荡是一种能量分布均匀的非主导不稳定模式。单次27小时的自持实验发现,低频振荡对发射极和孔板有明显的影响,从而降低阴极寿命。通过振荡特性了解了碘阴极内外的主要反应过程及反应之间的影响关系。为今后提高碘空心阴极的性能提供了理论依据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Oscillations of iodine LaB6 hollow cathode
Iodine-fed electric propulsion systems have achieved significant technological progress in recent years, the operating range of these systems remains fundamentally limited by ampere level iodine compatible hollow cathode technology. Preliminary studies on discharge characteristics have found that LaB6 hollow cathode is a potential strategy. In this study, a conventional LaB6 hollow cathode made with iodine-resistant materials was designed and tested in an iodine-compatible vacuum facility. The waveform, bispectral characteristics, and dispersion relation of the iodine hollow cathode were obtained and compared with the estimated collision reaction frequency. We analyzed the potential reaction processes both inside and outside the cathode and assessed how oscillation affects the lifetime of the iodine hollow cathode. The results indicate that the chaotic low-frequency oscillations were the main oscillation mode affecting the performance of the iodine cathode, involving multiple reaction processes that interfere with each other. The oscillation inside the cathode was mainly affected by vibrational excitation and iodine molecular ionization, while the oscillation outside the cathode was affected primarily by processes such as neutral gas flow, excitation, ionization, dissociation, and ion transit-time instability. The overall oscillation of iodine cathode is a non-dominant unstable mode with uniform energy distribution. A single 27-h self-sustaining experiment found that low-frequency oscillation has a significant impact on the emitter and the orifice, thereby reducing the cathode lifetime. The main reaction process inside and outside the iodine cathode and the influence relationship between the reactions were understood by the oscillation characteristics. It provides a theoretical basis to improve the performance of the iodine hollow cathode in the future.
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来源期刊
Vacuum
Vacuum 工程技术-材料科学:综合
CiteScore
6.80
自引率
17.50%
发文量
0
审稿时长
34 days
期刊介绍: Vacuum is an international rapid publications journal with a focus on short communication. All papers are peer-reviewed, with the review process for short communication geared towards very fast turnaround times. The journal also published full research papers, thematic issues and selected papers from leading conferences. A report in Vacuum should represent a major advance in an area that involves a controlled environment at pressures of one atmosphere or below. The scope of the journal includes: 1. Vacuum; original developments in vacuum pumping and instrumentation, vacuum measurement, vacuum gas dynamics, gas-surface interactions, surface treatment for UHV applications and low outgassing, vacuum melting, sintering, and vacuum metrology. Technology and solutions for large-scale facilities (e.g., particle accelerators and fusion devices). New instrumentation ( e.g., detectors and electron microscopes). 2. Plasma science; advances in PVD, CVD, plasma-assisted CVD, ion sources, deposition processes and analysis. 3. Surface science; surface engineering, surface chemistry, surface analysis, crystal growth, ion-surface interactions and etching, nanometer-scale processing, surface modification. 4. Materials science; novel functional or structural materials. Metals, ceramics, and polymers. Experiments, simulations, and modelling for understanding structure-property relationships. Thin films and coatings. Nanostructures and ion implantation.
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