Leaders in Synchrotron beamline systems and components

APD Bodies

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The FMB Oxford APD detector is an ultra-fast detector system using an avalanche photodiode, for X-ray scattering experiments up to 20keV.

It offers the ultimate in speed, resolution, efficiency and noise levels whilst maintaining a robust and easy to use architecture; making it ideal for experiments with a large dynamic range, time resolved measurements and fast photon counting.

The system requires an APD detector head, signal processing electronics and a signal cable. This section details the APD detector head and the two processing modules offered by FMB Oxford.

The FMB Oxford APD Detector Head comes in three standard formats, 5×5 rectangular body, 5×5 cylindrical body and a 10×10 transmissive version all with integrated preamplifier, in the housing.


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5 x 5 mm10 x 10 mm 5 x 5 mm10 x 10 mm
70μm Kapton 70μm Kapton 70μm Kapton 70μm Kapton
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Maximum count rate 100MHz *
Diode area 5mm x 5mm
Window 70μm Kapton
Housing dimensions 26mm x 20.85mm x 55mm (L)
Photon efficiency 50% that of NaI up to 10keV *
Noise below 1Hz *
Diode gain 200x at 370V bias
Preamplifier gain 60dB per stage at 100MHz
Rise time 10%-90% <2ns *
FWHM <4ns *
*indicative performance figures obtained at
the National Synchrotron Light Source,
Brookhaven National Laboratory