Electronic contactless position determination of EM photons or particles e.g. electrons

摘要

The detector system has a radiation-transparent top substrate (12), a photomultiplier (3), a photo-electron converter layer (4) positioned adjacent to a chevron plate forming a multichannel electron multiplier, situated within a high vacuum chamber (7), with a highly ohmic charge accumulating anode layer (1) on a lower glass substrate (6). On the reverse side of the lower substrate (6) outside the vacuum chamber is a further poorly ohmic anode structure (2) capacitatively coupled to the thin film, and composed of strips for positional read out of the incident emission. The capacitive transmission is possible due to the induced electron avalanche (8) providing coupling through the lower glass substrate.