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Becker and Hickl: New PMC-150 detector has 120 ps IRF width

pmc100

The Becker and Hickl PMC-150 is a cooled PMT module for TCSPC applications. It contains a fast miniature PMT along with a Peltier cooler, a high voltage generator, a GHz pulse amplifier and a current sensing circuit. Due to the high gain and bandwidth of the device a single photon yields an output pulse with an amplitude in the range of 100 to 200 mV and a pulse width of 1.5 ns.  Due to the high gain and the efficient shielding noise pickup is minimised. Therefore the PMC-150 yields high time resolution and high counting efficiency.

Pmc 150 irf 01 txt comp120

Fig 1: IRF for 1 mm spot and for full cathode illuminated.

Pmc 120 110 shiftx 1ns comp120

Fig 2: Variation of IRF with position on photocathode.

The TCSPC instrument response function (IRF) has a width of less than 130 ps FWHM. The IRF shift with the position at the photocathide is less than 50 ps. Overload conditions are detected by sensing the PMT output current. Overload is indicated by an LED, an acoustic signal, and a logical overload signal. The PMC 150 is operated by the bh DCC-100 detector controller card. The DCC delivers the operating voltage for the PMT, the current for the Peltier cooler, controls the detector gain, and shuts down the PMT in case of overload. Compared to its predecessor, the PMC-100, the PMC-150 has a shorter IRF width and a better IRF uniformity over the active area.

Download datasheet here

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