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The | The '''Micro-channel plate (MCP)''' is a form of secondary electron multiplier that can be included in a [[CRT]] to improve the brightness of the | ||
trace at high sweep rates. Typically it sits directly behind the face of the CRT. | trace, which is needed particularly at high sweep rates. Typically it sits directly behind the face of the CRT. It requires its own bias voltage. | ||
It requires its own bias voltage. | |||
The electron beam passes through the deflection plates before it hits the micro-channel plate, which consists of parallel channels | |||
offset at a slight angle to the beam. The inside walls of these channels are coated with resistive material, with an acceleration voltage | |||
on the order of 1 kV applied between back and front of the plate. Electrons entering a channel hit the wall where they initiate a cascade | |||
of secondary electron emission like in a photomultiplier. At the exit of the channels, a final acceleration voltage propels the beam across | |||
a small gap toward the CRT's phosphor coating. In a typical MCP CRT like the [[T7100]], the channels have 25 μm diameters. | |||
MCP amplification deteriorates in proportion to total charge passed per channel or unit of area, making them | |||
particularly prone to a form of burn-in. | |||
Careful biasing along with beam current/time limiting mechanisms are necessary to achieve the full life time. | |||
The MCP enables an improved system bandwidth overall. | |||
MCP tubes are used in the following Tektronix products: | MCP tubes are used in the following Tektronix products: | ||
* [[7104]] | * [[7104]]/[[R7103]]: [[T7100]] | ||
* [[ | * [[2467]]/[[2467B]]: [[T2467]] | ||
* [[ | * [[11302]]/[[11302A]]: [[T7707]] | ||
* [[7250]] | * [[7250]] (in the [[scan converter]] tube, not the visible CRT) | ||
[[File:Micro-channel plate diagram.jpg | 600px |MCP diagram]] | |||
==Links== | ==Links== | ||
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* [http://w140.com/US4931704.pdf US Patent 4931704] | * [http://w140.com/US4931704.pdf US Patent 4931704] | ||
* [http://w140.com/US4956548.pdf US Patent 4956548] | * [http://w140.com/US4956548.pdf US Patent 4956548] | ||
* [https://www.youtube.com/watch?v=v9KaTgChudw Tektronix 2467B "Bright Eye (tm)" Oscilloscope promotional video] | |||
[[Category:Micro-channel plate CRTs]] | [[Category:Micro-channel plate CRTs]] |
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