water cooled housings

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The effect of cooling

At room temperature, the contribution from thermally generated electrons from the photocathode dominates. This figure shows the effect of temperature on dark counts and the advantage of cooling in low level detection is obvious. For all cathodes shown, there is little advantage in cooling below -25 °C

LCT 50 - Up to Ø52 mm photomultipliers.

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The LCT50 is a liquid cooled housing designed for photomultipliers up to Ø52 mm. Usually connected to the domestic water supply, lower temperatures can be achieved by using cooled, recirculating liquid.

Features include:

capable of cooling to 50 °C below the cooling liquid temperature
included positive or negative HV voltage divider
space for additional circuitry
evacuated double walled Pyrex window for condensation free use
over temperature cut out with visual and audible warning
can be set to within 0.1 °C

The standard Pyrex window has a short wavelength cut-off at 280 nm. An optional quartz window is available for use in the UV; this extends detection down to 170 nm.