Abstract:
A method and system for providing a micro-channel plate detector. An anodized aluminum oxide membrane is provided and includes a plurality of nanopores which have an Al coating and a thin layer of an emissive oxide material responsive to incident radiation, thereby providing a plurality of radiation sensitive channels for the micro-channel plate detector.
Abstract:
An MCP has a rectangular plate shape and has a porous part, to which a plurality of pores (channels) penetrating in the thickness direction are disposed, and a poreless part including a solid glass or the like to which the channels are not provided on the both sides of the porous part. Then, on both surfaces of the MCP, an input side electrode and an output side electrode are respectively formed so as to cover the poreless parts on the both surfaces while sandwiching the porous part.
Abstract:
An electron multiplier that can easily obtain characteristics according to a purpose is provided. By bonding a marginal portion 23 of an MCP 2 and a marginal portion 33 of an MCP 3 to each other via a conductive spacer layer 7, a gap 12 is formed between channel portions 22, 32. Therefore, when the electron multiplier is used for a purpose that requires a particularly high gain, by adjusting the thickness of the spacer layer 7, the gain can be increased by increasing the gap 12. In addition, when the electron multiplier is used for a purpose that requires an increase in gain as well as time characteristics, by adjusting the thickness of the spacer layer 7, the size of the gap 12 can be adjusted so that desired characteristics are obtained. Consequently, by only adjusting the thickness of the spacer layer 7, characteristics according to the purpose can be easily obtained.
Abstract:
A microchannel plate includes a substrate defining a plurality of pores extending from a top surface of the substrate to a bottom surface of the substrate. The plurality of pores includes a resistive material on an outer surface that forms a first emissive layer. A second emissive layer is formed over the first emissive layer. The second emissive layer is chosen to achieve at least one of an increase in secondary electron emission efficiency and a decrease in gain degradation as a function of time. A top electrode is positioned on the top surface of the substrate and a bottom electrode is positioned on the bottom surface of the substrate.
Abstract:
A photomultiplier for receiving incident light on a photocathode, and cascade-multiplying electrodes emitted from the photocathode by a secondary electronic effect of a plurality of dynodes, whereby the incident light is detected. The photomultiplier includes a slowing-down electrode for decelerating those of secondary electrons emitted from a dynode on the first stage to a dynode on the second stage which have a higher speed. Because of the slowing-down electrode the secondary electrons having a higher speed are selectively decelerated, whereby a transit time spread of the secondary electrons emitted from parts of the first stage-dynode to the second stage-dynode is relatively decreased.
Abstract:
Electric discharge element comprising a cathode which cooperates with an electron duct cavity which is defined by walls of electrically insulating material having a secondary emission coefficient .delta., which cavity has an output aperture, while electrode means which can be connected to a voltage source are provided for applying, in operation, an electric field across a path in the cavity from the cathode to the output aperture so as to enable electron transport through the cavity.
Abstract:
A photomultiplier tube comprises a photocathode (10) deposited on an input window (20) sealed to one end of a sleeve (30), an input electrode (40), and an electron multiplier (50) with stacked dynodes. The input electrode (40) is constituted by a truncated cone conductor on the inside of which the electron multiplier (50) with stacked dynodes is deposited. A generator (61,62) of a material forming the photocathode (10) is advantageously placed in the space (70) situated between the input electrode (40) and the sleeve (30).
Abstract:
A micro secondary electron multiplier or an array thereof employs discrete dynodes which are microstructured and applied to an insulating substrate plate. The substrate plate is provided with electrical conductor paths for the connection of the dynodes. The dynodes can be made using a technique such as X-ray depth lithography-galvanoplasty (the LIGA technique). The micro secondary electron multiplier or an array of such multipliers is extremely small and sensitive, and has a high time resolution. Furthermore there is considerable flexibility in positioning the multipliers of an array.
Abstract:
Photomultiplier tube (10) comprising a photocathode (20), a first cylindrical dynode (30), an electron multiplier device (40) of the "leaf" type, and a device (50) for coupling the first dynode (30) to the multiplier device (40). According to the invention, the said coupling device (50) consists, on the one hand, of a first electrode (51) composed of a cylindrical lateral plate (52) of axis parallel to that of the multiplier device and of an upper plate (53) pierced by an opening (54) for passage of the photoelectrons (21) towards the first dynode (30), and, on the other hand, of a second plane electrode (55) situated between the exit (32) of the first dynode (30) and the entrance (42) of the multiplier device (40).
Abstract:
Photomultiplier tube 10 segmented into a plurality of elementary photomultipliers 11 comprising a photocathode 12 and a multiplier 13 of the type using sheets partitioned into a plurality of elementary multipliers 14. According to the invention the input space of the tube 10 located between the photocathode 12 and the multiplier 13 is partitioned into elementary input spaces 15 associated with the elementary photomultipliers and defining a plurality of elementary photocathodes 16, with each elementary input space 15 having a focussing electrode which causes the photo-electrons emitted by the associated elementary photocathode 16 to converge on the corresponding elementary multiplier 14.