Modular system with VITUS SDD and reset type low-noise preamplifier in thermally optimized AXAS-M1 housing.



  • Available with H80 and H150 CUBE

  • Thermal optimized housing

  • KETEK reset type preamplifier

  • Customized finger length available

  • Filtering for SDD operating voltages

  • SDD operating temperature readout


  • Customized modular housing

  • Standardized Euro-PCB plug-in slots

  • Linear regulated power supplies

  • International wide range power input

  • Optional Digital Pulse Processor KETEK DPP2

  • Peaking times from 0.1 µs to 24 µs (with DPP2 only)


Figure 1: Typical spectrum of a 150 mm² KETEK VITUS CUBE SDD in AXAS-M, acquired with KETEK DPP2 Software at 1 µs peaking time.

Ketek AXAS-M Spectrum

AXAS-M H80 CUBE Throughput


Figure 2: The diagram provides the throughput behavior of the AXAS-M H80 CUBE including the optional Digital Pulse Processor (DPP2). It shows the dependency of the output count rate with the input count rate for different peaking times. The lower the peaking time, the higher is the maximum throughput for a system.

Energy Resolution

Figure 3: Energy Resolution with Input Count Rate: The energy resolution of the AXAS-M H80 CUBE acquired with KETEK DPP2: The energy resolution of the digital system is absolutely independent from the input count rate. The graph shows the dependency of the Full Width at half maximum with the incoming photons (input count rate) for different peaking times.

AXAS-M H80 CUBE Energy Resolution

AXAS-M H80 CUBE Energy Resolution

Figure 4: Peak Position: The graph shows the independency of the peak position of the Mn-Kα line with the input count rate for different digital peaking times for the AXAS-M H80 CUBE with an optional Digital Pulse Processor (DPP2).


Figure 5: The backplane of the AXAS-M2 with all available connectors is shown. The KETEK DPP2 is required for operation of the digital output (USB).

AXAS-M2 connectors

Ketek AXAS-M1 Geometries

Geometries AXAS-M1

Figure 6: All AXAS detectors have a compact aluminum housing plated with Nickel. The screws are made of stainless steel. An AXAS can be fixed to a plate using M3 screws. The mounting plates are compatible for all AXAS’. The finger diameter for the AXAS-M1 is 25mm.

Geometries AXAS-M2

Figure 7: In addition to the AXAS-M1 unit (please see figure 6), the AXAS-M comes with an AXAS-M2 power supply unit with optional DPP. Figure 7 shows its geometries.

Ketek AXAS-M2 Geometries

Analog Output Signal

Figure 8: The AXAS-M is equipped also with an analog output which can be used together with the digital output simultaneously (DPP2 required). The shape of this analog output signal (ramped reset type) is shown on the graph. The ramp amplitude is approx. 3 V.

Ramped reset type analog output signal

Ramp with steps

Figure 9: If the detector is exposed to an X-ray radiation small steps are visible in the ramp signal. The height of each step corresponds to the energy of the single photon (one event).

Technical Data

* available with KETEK DPP2 only
Operating temperature range 0 to +50 °C Storage temperature range 0 to +50°C
Temperature monitor Thermistor Power supply 220/110 VAC
Signal output Low noise preamplifier Signal form Ramped reset type +1 V to -2 V; 5 mV/keV
Output connector (analog) LEMO FFS.00.250 Vacuum tightness Optional; He leakage rate <10-6 mbar · l/s
Digital interface* USB 2.0 Channel depth* 24 bit
Number of channels* max. 8192 ADC* 14 bit
Peaking time range* 0.1 to 24 µs in 24 steps Maximum read-out speed* 1 ms (@1024 channels)
Software parameters* Digital gain, threshold, peaking time etc. Clock frequency* 40 MHz

Available Options

  CUBE Class
VITUS SDD Guaranteed FWHM [Mn Kα] @ 1 µs PT Finger length [mm] Vacuum-tightness of snout Digital Pulse Processor
H80 ≤ 136 eV 50, 100 (standard), 200 Yes (optionally) Yes (optionally)
H150 ≤ 136 eV 50, 100 (standard), 200 Yes (optionally) Yes (optionally)