HIGH-CURRENT GRID-CONTROLLED ELECTRON MULTIPLIER TUBE

Technical Report · Wed Apr 01 04:00:00 EST 1959

OSTI ID:4246492

Stambach, G L; Graham, W J; Hanley, T E

A grid-controlled secondary-emission electron multiplier amplifier tube has been designed and built which can deliver an output pulse of five amperes into a load impedance of 100 ohms, with a rise time of less than 10 millimicroseconds and a transit time of less than 20 millimicroseconcs. The measured transconductance of the tube is 600,000 mu mhos, and it can provide a positive output pulse with a positive grid input. The tube is constructed as a series of concentric cylinders, with the grid and cathode structure of a 6AG7 pentede serving as a controlled emitter source. Outside the last grid, a series of four louvered, concentric dynodes are placed, with the first dynode serving as the missing pentode plate. Outside the last dynode is a screen-mesh collecter and a fifth dynode. From the fifth dynode, a solid cylinder, the output pulse is taken. The concentric geometry has several advantages. Space-charge difficulties are decreased because the current gain at each dynode may be kept at a high level without increasing the current density in proportion. Furthermore, the geometry is suited to a coaxial input and output for obtaining optimum rise- time characteristics. (auth)

• Research Organization: Naval Research Lab., Washington, D.C.
• NSA Number: NSA-14-001640
• OSTI ID: 4246492
• Report Number(s): NRL-5317; NA 442-002
• Country of Publication: United States
• Language: English

Related Subjects

CATHODES
CONTROL
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CYLINDERS
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