Xspress 3

The next generation of solid state detector readout. Capable of data collection at count rates 4 Mcps. Many solid state detectors are not limited by their intrinsic rate capability, but by the readout system connected to them.


What is it? How does it work?

The Quantum Detectors Xspress 3 was developed to maximise the throughput and resolution of solid state detectors and remove the bottleneck at the readout stage. With count rates measured at over 4 Mcps, this readout is an order of magnitude faster than the systems many users have on their beamlines. Xspress 3 can open up the beamline to much faster data collection, its dynamic range can reduce the number of scans required and save large amounts of time with attenuation selection.

The adaptive filter in Xspress 3 offers the best use of the data available from solid state detectors. Instead of picking a shaping time and working with the results, the system effectively takes data at all shaping times from 12.5 ns to 12.8 µs and yields every bit of resolution in time and energy out of it. So at the same time as capturing the highest resolution data, with 1024 points above and below the edge, the system is also capturing data at a rate of 80 MHz with as little as one point above and below each edge. All of this, without the need to repeat the experiment even once to try a different shaping time or attenuator. The outcome is a much greater understanding of the experiment in less experimental time. Having invested significantly on a cutting edge beamline, end station and detector, you now have the opportunity to offer your users significantly faster, higher resolution results by upgrading to an Xspress 3 from Quantum Detectors for your detector.




Max rate at over 4 Mcps

The Xspress 3 can handle rates at over 4 million counts per second.

Unparalleled energy resolution

Max E resolution of 127 eV at 35 kHz for Mn with Vortex ME4.

Up to 32 channels

The Xspress3 can be provided with up to 32 channels, with differential input available on request.

Peak stability

30 eV over a 3 MHz range at Iron Foil. 0.4%

Custom ROIs

Get the standard 16 ROIs per channel or opt for more on request.

Custom frames

4096 frames are provided as standard but millions can be acquired.

Peaking Time

Peaking Time is not used for Xspress3. The sampling time is 12.5 ns to 12.5 ns/point x 1024 points equals 12.8 µs.

Pileup Inspection

Effective input / output correction system.

Nanosecond deadtime

Less than 100 ns deadtime per event.


  • Data Transfer Rate 10 GB/s fibre to output full histograms with 4096 points per spectrum in real time.
  • I/O 4x TTL in, 4x TTL out, 16+ custom AUX.
  • Detector Calibration Stable


The following video is an introduction to the basic features of Xspress 3 operated using the EDM interface for EPICS. MEDM screens are also available, but they are similar enough that the following video also applies to them. The primary EPICS components were developed by Diamond Light Source with help from the APS, see details here.

Open source software for mapping is available from contributing scientists, please get in touch for details.

The TANGO implementation of the drivers is based on the same C API as the EPICS interface. It has been built to specifications designed collaboratively with the ESRF and Daresbury Lab.

The TANGO implementation of the drivers is based on the same C API as the EPICS interface. It has been built to specifications designed collaboratively with the ESRF and Daresbury Lab.

Xspress3 can also be operated through a web based graphical user interface (GUI).
Chris Hearn

Chris Hearn

Technical Sales Engineer

Warning: file_put_contents(): Only 0 of 218 bytes written, possibly out of free disk space in /home/quantumd/public_html/wp-content/themes/Divi/core/components/cache/File.php on line 107