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Photonis Microchannelplate Selection Guide

To select your microchannelplate based detector solution you need to consider the following questions amongst others:

What am I aiming to detect?

Microchannelplate detectors can be used for dectection of electrons, neutrals, ions and photons (xray and UV). Where detection of photons is required special surface coatings may be employed improve the conversion efficiency to electrons at the front of the detector.

Will I be imaging or not?

If imaging is required then "Imaging" quality or even "Premium" quality plates will be required. The specifications for these plates include tolerances on variation in gain across the plate and patterning. The image resolution required may also affect the channel spacing required.

What gain/dynamic range do I require?

Particle counting applications require high gain and may also require well defined pulse height distributions. In these cases a 'Chevron' pair of plates is most commonly used (sometimes even 3 plates in a 'Z' stack). Where very high count rates are anticipated the extended dynamic range plates (EDR) may be needed; their higher bias currents allow individual channels to recover faster.

For analogue amplification of a few thousand a single plate may suffice. The dynamic range is then limited by the largest current that may be drawn from the rear of the plate. As a rough guide, to stay in the linear region of operation, the current drawn from the output should be less than one tenth of the bias current. For a typical standard 25mm plate the bias current is 4 - 16µAmp whereas for an extended dynamic range plate it would be 30 - 128µAmp.

What active area do I need?

This determines the size of plate required. All sized are quoted by reference to the nominal active area. Not surprisingly, larger plates are more expensive. 25mm active area plates are probably the most commonly used and offer the greatest choice of options.

There are a very large number of possibilities and we would be happy to discuss any special requirements and supply a quote. However, where possible, it is usually best to pick from one of the standard plate specifications or assemblies. We have tried to give an indication of the wide range of standard configurations in the table below below:

MCPs available from stock
Working area Pore Size in microns 40:1/46:1 Length to pore diameter ratio 60:1 Length to pore diameter ratio Standard EDR
8mm diameter 25 yes - yes -
11.5mm diameter 10 yes - yes -
18mm diameter 5 - yes yes -
10 yes yes yes yes
25mm diameter 5 yes yes yes yes
10 yes yes yes yes
25 yes yes yes yes
40mm diameter 10 yes yes yes yes
25 yes yes yes yes
50mm x 8mm 25 yes - yes -
75mm diameter 10 yes - yes yes
25 yes yes yes -
80mm x 100mm 25 yes - yes yes
84mm diameter 25 yes - yes -
90mm x 110mm 25 yes - - yes
100mm x 15mm 25 yes yes yes -
120mm diameter 25 - yes yes -
150mm diameter 25 yes yes yes -

Micro Channel plate Options

Plates are available as :

With a coating on front face of:
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Last updated:16:41 28/10/2016

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