Optimization of Electrostatic Focusing for Line Source Electron Beam Emitter Assembly

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• 作者：Munawar Iqbal ; ^{muniqbal@yahoo.com} ; ^{muniqbal.chep.@edu.pu.pk} ; Ghalib ul Islam ; Ayub Faridi ; Harris Rashid
• 关键词：Acceleration voltage ; cathode ; beam diameter ; focusing electrode & distance
• 刊名：Physics Procedia
• 出版年：2012
• 出版时间：2012
• 年：2012
• 卷：32
• 期：Complete
• 页码：891-895
• 全文大小：1020 K

文摘

We studied and analyzed the design of line source electron gun numerically and verified results experimentally. A minimum beam diameter of 0.9 mm is achieved in the post anode region at a distance of 20 mm from the centre of cathode surface. Simulated and experimental results are in good agreement showing the maximum focusibilty, emission and beam uniformity throughout the emission surface. The gun is simple without any magnetic field and extra biasing to the focusing electrode. The gun is extremely useful for all type of metallurgical applications in general and for surface coating and surface modification experiments in special.