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<p>Spacecraft components working in a complex plasma environment in space environment, and the dielectric modules in the components face the important issue of surface charging. In this work, we quantitatively study the surface potential evolution for dielectrics. The results show that continuous irradiation by the electron beam causes the dielectric surface to reach a balance state, and the balance surface potential is significantly affected by the initial surface potential, the primary electron energy of the incident electrons, and the second critical energy (<i>E</i><sub>p2</sub>) of the dielectric. Calculation results show that irradiating uncharged Al<sub>2</sub>O<sub>3</sub> sheet continuously with an electron beam of 15,000&#xa0;eV energy can reach a surface potential of − 9501.01&#xa0;V, which is a risky high potential. While the balance potential of MgO sheet under the same irradiation condition is only − 1632.34&#xa0;V, indicating that dielectrics with higher <i>E</i><sub>p2</sub> are more favorable for mitigating surface charging. Besides, at electron landing energies below <i>E</i><sub>p2</sub>, the surface potentials due to irradiation are too low to induce electrostatic discharge. Multipacting simulations for coaxial filters filled with Al<sub>2</sub>O<sub>3</sub> sheets show that the first critical energy (<i>E</i><sub>p1</sub>) of the dielectric is affected by the surface potential and further influences the device multipacting threshold. A surface potential of + 20&#xa0;V/− 80 causes the <i>E</i><sub>p1</sub> of Al<sub>2</sub>O<sub>3</sub> sheets to drop/increase from 40&#xa0;eV to 20&#xa0;V/120&#xa0;eV, resulting in a decrease/increase in the filter multipacting threshold from 173.4 to 145.3&#xa0;W/318.4&#xa0;W. The work is valuable for researching the dynamic charging behavior of dielectric surfaces, and for the engineering application of dielectric multipacting in microwave devices.</p>

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Dynamic charging behavior of dielectric surfaces induced by electron beam irradiation and its effect on multipacting

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月1日

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  • Yali Su,
  • Jiahao Liang,
  • Dongwei Chen,
  • Wenjun Li,
  • Xin Zhang,
  • Dan Wang,
  • Guohe Zhang

摘要

Spacecraft components working in a complex plasma environment in space environment, and the dielectric modules in the components face the important issue of surface charging. In this work, we quantitatively study the surface potential evolution for dielectrics. The results show that continuous irradiation by the electron beam causes the dielectric surface to reach a balance state, and the balance surface potential is significantly affected by the initial surface potential, the primary electron energy of the incident electrons, and the second critical energy (Ep2) of the dielectric. Calculation results show that irradiating uncharged Al2O3 sheet continuously with an electron beam of 15,000 eV energy can reach a surface potential of − 9501.01 V, which is a risky high potential. While the balance potential of MgO sheet under the same irradiation condition is only − 1632.34 V, indicating that dielectrics with higher Ep2 are more favorable for mitigating surface charging. Besides, at electron landing energies below Ep2, the surface potentials due to irradiation are too low to induce electrostatic discharge. Multipacting simulations for coaxial filters filled with Al2O3 sheets show that the first critical energy (Ep1) of the dielectric is affected by the surface potential and further influences the device multipacting threshold. A surface potential of + 20 V/− 80 causes the Ep1 of Al2O3 sheets to drop/increase from 40 eV to 20 V/120 eV, resulting in a decrease/increase in the filter multipacting threshold from 173.4 to 145.3 W/318.4 W. The work is valuable for researching the dynamic charging behavior of dielectric surfaces, and for the engineering application of dielectric multipacting in microwave devices.