Studying of non-stationary heating processes of self-heated hollow cathodes

Koshelev, N. V.; Loyan, A.V.; Lobov, Serhii O.

doi:10.2514/6.1999-2864

Cited by 1 publication

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the compact and closed structure characteristics of HHC make is therefore difficult to investigate the internal plasma evolution and the temperature variation of the structure. The previous studies mostly focused their attention on the voltage-current characteristics, plasma parameters of the outer plume, the influence of structure and ignition parameters [7][8][9][10][11]. So a transparent HHC is designed to allow observation of the photons from plasma radiation and material's thermal radiation and gain a better insight into the physical processes during the cathode operation.…”

Section: Introductionmentioning

confidence: 99%

Temperature measurement and simulation analysis of heaterless hollow cathode during start-up process

Han¹,

An²,

Liu³

et al. 2022

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

Monochromatic radiation thermometry is used to quantify temperature distribution during the start-up process for a heaterless hollow cathode. A transparent cathode is designed to facilitate the transmission of thermally and spontaneously radiated photons from the interior of the structure and their reception by the detection equipment. The relative radiation intensities can be obtained by the developed measurement equipment, which consists of an sCMOS camera and a 780 nm narrow-band filter, and then transformed into temperature distributions calibrated by a two-color pyrometer. The current and voltage characteristics of the anode and keeper and plasma image captured by the high-speed camera are used to analyze the thermal evolution mechanism. A 2-D extended fluid model coupling with a thermal model is also developed and used to help clarify the thermal deposition variation at different locations. These results provide further support for the hypothesis that thermal deposition of ions and electrons, thermal conduction, and thermal radiation all affect the rate of change in temperature of various components.

show abstract

Section: Introductionmentioning

confidence: 99%