Abstract
This chapter shows observation of a work with a single dynode, and highlights how to use some means of detecting the transmitted secondary electrons which is not subject to the large fluctuations associated with multiplication at further dynodes. These observations are of importance in assessing the capabilities of this type of image intensifier as an image-preserving device, but they do not allow reliable inferences to be drawn about the statistics of electron multiplication at a single transmission-type dynode. Thus, although the measurements that have been made with completed intensifiers are consistent with an exponential probability law for electron multiplication at each transmission-type dynode, they do not prove that such a law is in fact obeyed. An experimental arrangement is also discussed in this chapter. The dynode is held in a continuously pumped tube fabricated from short glass cylinders sealed to Nilo-K rings that are attached to stainless steel annuli which serve as accelerating electrodes. These experiments require the dynode to be moved into and out of the beam repeatedly, and the present tube does not give consistent results. A diagram of experimental arrangement shown in this chapter examines statistics of secondary electron emission from a transmission-type dynode.
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