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.

Graph of The Effect of Cooling on Dark Counts

Features include:

  • capable of cooling to 50 °C below the cooling medium 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.

Air Cooled Housings

FACT 50 - Up to Ø52 mm photomultipliers.

The FACT50 is a forced air cooled housing.

Click view more information to view the drawing.

FACT50 Housing diagram

FACT50 power supply diagram

Water Cooled Housings

LCT 50 - Up to Ø52 mm photomultipliers.

Click view more information to view the drawing.

LCT50 Housing diagram

LCT50 Power Supply diagram

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ET Enterprises is a trading name of ET Enterprises Limited. Registered in England & Wales, company number 06081468.