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

Authors

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