Barcellan L, Berto E, Carugno G, Galet G, Galeazzi G, Borghesani A F
INFN Section, Padua, Italy.
Rev Sci Instrum. 2011 Sep;82(9):095103. doi: 10.1063/1.3636078.
We report on the design of a new type of hot-filament electron gun delivering fairly high current (a few hundreds of μ A) at high voltage (up to 100 kV) in continuous or pulsed mode. Its novel features are that the filament is heated by means of a pack of rechargeable batteries floated atop the high-voltage power supply in order to get rid of bulky isolation transformers, and that the filament current and, hence, the electron gun current, is controlled by a feedback circuit including a superluminescent diode decoupled from the high voltage by means of an optical fiber. This electron gun is intended for general purposes, although we have especially developed it to meet the needs of our experiment on the infrared emission spectroscopy of rare gas excimers. Our experiment requires that the charge injection into the sample is pulsed and constant and stable in time. The new electron gun can deliver several tens of nC per pulse of electrons of energy up to 100 keV into the sample cell. The new design also eliminates ripples in the emission current and ensures up to 12 h of stable performance.
我们报道了一种新型热丝电子枪的设计，该电子枪能在连续或脉冲模式下，于高电压（高达100 kV）下提供相当高的电流（几百微安）。其新颖之处在于，灯丝由一组漂浮在高压电源之上的可充电电池加热，以摆脱笨重的隔离变压器；并且灯丝电流，进而电子枪电流，由一个反馈电路控制，该反馈电路包括一个通过光纤与高压解耦的超发光二极管。这种电子枪适用于一般用途，尽管我们是专门为满足我们关于稀有气体准分子红外发射光谱实验的需求而开发的。我们的实验要求注入样品的电荷是脉冲式的，并且在时间上是恒定且稳定的。这种新型电子枪每次脉冲能将能量高达100 keV的几十纳库电子注入样品池。新设计还消除了发射电流中的纹波，并确保长达12小时的稳定性能。
