Numerical calculation of the temperature distribution along a tungsten filament cathode to explain its breakage near its negative terminal

Authors

Marko E. Arciaga National Institute of Physics, University of the Philippines Diliman
Henry J. Ramos National Institute of Physics, University of the Philippines Diliman
Toshiro Kasuya Department of Electronics, Doshisha University, Japan
Alexander G. Mendenilla Department of Electronics, Doshisha University, Japan
Motoi Wada Department of Electronics, Doshisha University, Japan

Abstract

The temperature distribution along a tungsten straight filament used as an electron emitter and hot cathode in a gas discharge was numerically obtained by solving the power density balance equation. The results were able to verify that the portions of the filament near its negative terminal had a relatively higher temperature compared to the portions near the positive terminal. For a filament with a length of 9 cm, diameter of 0.5 mm, and electrically heated by 25 Amps of current, the simulation revealed that the highest temperature along the filament occurred at a distance of 1.2 cm away from the negative terminal, which explained why the filaments always broke near this location in the previous experimental findings.

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Issue

2004: Proceedings of the 22nd Samahang Pisika ng Pilipinas Physics Congress

Article ID

SPP-2004-3B-04

Section

Plasma Physics

Published

2004-10-25

How to Cite

[1]

ME Arciaga, HJ Ramos, T Kasuya, AG Mendenilla, and M Wada, Numerical calculation of the temperature distribution along a tungsten filament cathode to explain its breakage near its negative terminal, Proceedings of the Samahang Pisika ng Pilipinas 22, SPP-2004-3B-04 (2004). URL: https://proceedings.spp-online.org/article/view/SPP-2004-3B-04.