大功率流水真空电子加热器用电弧等离子体沉积分配器阴极

IVESC 2004. The 5th International Vacuum Electron Sources Conference Proceedings (IEEE Cat. No.04EX839) Pub Date : 2004-09-06 DOI:10.1109/IVESC.2004.1414200

V. Abrosimov, O. Maslennikov

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引用次数: 0

摘要

介绍了一种新型真空电子加热器的主要设计方案。真空电子加热器(VEH)是一种由热离子阴极和阳极组成的真空二极管。阳极用流动的水冷却。由钨加热器加热的热电分配器阴极发出电子电流。由阳极供电电压加速的电子动能转化为阳极热量。因此，夹套内的流动水被加热。通过在700到1000/spl度/C范围内改变分配器阴极的工作温度，可以平滑地控制输出功率。阴极位于腿上的真空体中，密封地固定在绝缘体中。VEH阴极为圆柱体形式，外径22-24mm，高度不小于100mm。采用电弧等离子沉积法在钼柱表面制备了厚度为0.5 ~ 0.7mm的多孔钨基。将3BaO-CaO-Al/sub - 2/O/sub - 3/组成的发射物质浸渍在基体上，然后通过机械处理形成所需尺寸的发射表面。在VEH工作过程中，阴极发射表面电流密度不高于IA/cm/sup 2/。

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Arc-plasma deposited dispenser cathode for use in powerful flow water vacuum electron heater

A principal new design of vacuum electron heater is presented. The vacuum electronic heater (VEH) is developed as a vacuum diode and contains a thermionic cathode and an anode. The anode is cooled by flowing water. The thermonic dispenser cathode heated by tungsten heater emits an electron current. Kinetic energy of the electrons accelerated by the supply-line voltage of the anode is transformed to the anode heat. Therefore the flow water in the jacket is heated. Smooth control of output power is provided by variation of working temperature of the dispenser cathode in range of from 700 up to 1000/spl deg/C. Cathode is located in vacuum volume on the legs and hermetically fastened in an insulator. The cathode of VEH has form of cylinder with outer diameter of 22-24mm and height of not less than 100mm. Porous tungsten matrix with thickness of 0.5-0.7mm is built on the surface of molybdenum cylinder by arc-plasma deposition method. The matrix is impregnated by emission substance with composition of 3BaO-CaO-Al/sub 2/O/sub 3/ and then the emitting surface is formed by mechanical treatment to get needed dimensions. During VEH operation current density on the cathode emission surface isn't higher than IA/cm/sup 2/.

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IVESC 2004. The 5th International Vacuum Electron Sources Conference Proceedings (IEEE Cat. No.04EX839)

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