Unification of the breakdown criterion for thermal field emission-driven microdischarges

IF 3.5 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2024-09-05 DOI:10.1063/5.0227666

Chubin Lin, Jiandong Chen, Huihui Wang, Yangyang Fu

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Abstract

Determining the characteristics of thermal field emission-induced breakdown is essential for various electron emission devices, such as thermionic energy converters. In previous studies, several mathematical models were developed to determine the breakdown voltages driven by field emission under different conditions; however, complicated computations were required to solve the numerical equations. There is still no consensus on the breakdown criterion when the thermal field emission comes into play. In this work, a unified breakdown criterion for the thermal field emission-induced microdischarge is proposed based on the definition of the thermal field emission coefficient γTFE (combined with the thermionic emission coefficient γTE and field emission coefficient γFE) from the emission current. The breakdown voltages scaling with the cathode temperature and gap distance are quantified. Distinct regimes corresponding to different electron emissions and their transitions are examined with the cathode temperature and gap distance tuned across a range of values. The results from this study provide an evaluation of thermal field emission-induced breakdowns and the dominant electron emission mechanisms in distinct regimes can be straightforwardly determined from the present model.

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统一热场发射驱动微放电的击穿标准

确定热场发射引起的击穿特性对于热离子能量转换器等各种电子发射装置至关重要。在以往的研究中，人们建立了多个数学模型来确定不同条件下场发射驱动的击穿电压；然而，要求解数值方程需要进行复杂的计算。对于热场发射起作用时的击穿标准，目前仍未达成共识。在这项工作中，根据发射电流定义了热场发射系数γTFE（结合热离子发射系数γTE 和场发射系数γFE），并在此基础上提出了热场发射诱导微放电的统一击穿准则。击穿电压随阴极温度和间隙距离的变化而变化。随着阴极温度和间隙距离在一定范围内的调整，研究了不同电子发射及其转变所对应的不同状态。这项研究的结果提供了对热场发射引起的击穿的评估，并且可以通过本模型直接确定不同状态下的主要电子发射机制。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.

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