Microchannel plates having both improved gain and signal-to-noise ratio and methods of their manufacture

A microchannel plate having both increased gain and improved signal-to-noise ratio for receiving electrons and responsively releasing proportionate secondary electron-emission electrons to produce an intensified electron shower, said microchannel plate comprising:

• a plate-like glass substrate defining an electron-receiving face and an electron-discharge face, said substrate defining multiple angulated microchannels therethrough each opening at opposite ends on said electron-receiving face and on said electron-discharge face, said angulated microchannels each defining an entry portion adjacent to said electron-receiving face, and said microchannel plate providing at said entry portions respective high electron-emissivity electron-impact areas in perpendicular line of sight relation with the openings of said microchannels on said electron-receiving face, said high electron-emissivity electron-impact areas having a surface electron-emissivity coefficient greater than one;
• wherein said multiple microchannels are defined by a surface including a highly conductive tubular first cladding having ends which open onto said electron-receiving face and said electron-discharge face and a second cladding disposed on the inner surface of said first cladding, wherein said first cladding and said second cladding are formed of nonmetallic materials having a surface electron emissivity coefficient greater than one.

A microchannel plate having both increased gain and improved signal-to-noise ratio for receiving electrons and responsively releasing proportionate secondary electron-emission electrons to produce an intensified electron shower, said microchannel plate comprising:

• a plate-like glass substrate defining an electron-receiving face and an electron-discharge face, said substrate defining multiple angulated microchannels therethrough each opening at opposite ends on said electron-receiving face and on said electron-discharge face, said angulated microchannels each defining an entry portion adjacent to said electron-receiving face, and said microchannel plate providing at said entry portions respective high electron-emissivity electron-impact areas in perpendicular line of sight relation with the openings of said microchannels on said electron-receiving face, said high electron-emissivity electron-impact areas having a surface electron-emissivity coefficient greater than one;
• further comprising a conductive electrode coating disposed on at least a portion of said electron-receiving face, said electrode coating distributing an electrostatic field circumferentially around said microchannel plate;
• wherein said electrode coating is disposed on said electron-receiving face and into said entry portion of said plural microchannels with a circumferentially-varying angularity;
• wherein said electrode coating is disposed on a shaded surface part of said entry portion exclusive of said high electron-emissivity electron-impact area.