In an image intensification tube, which component accelerates electrons toward the output phosphor?

In an image intensification tube, the component that accelerates electrons toward the output phosphor is the intensifier anode. The intensifier anode serves a critical role by providing a positive charge that attracts the electrons emitted by the photocathode. When x-rays interact with the input phosphor, they generate light, which then causes the photocathode to emit electrons. These electrons are subsequently drawn towards the anode due to the electric field created by the anode's positive potential. This acceleration process enhances the overall efficiency of the image intensification process, allowing for brighter output images.

On the other hand, the electrostatic lenses are responsible for focusing the electron beam rather than accelerating the electrons. The x-ray tube anode is part of the x-ray generation process and not related to the interaction within the image intensifier, while the photocathode is where electrons are actually emitted from when interacting with light. Hence, while these components are vital to the functioning of the image intensification system, the intensifier anode specifically performs the function of accelerating the electrons toward the output phosphor.