AXAS-M
Modular system with VITUS SDD and reset type low-noise preamplifier in thermally optimized AXAS-M1 housing.
M1: DETECTOR HEAD UNIT
M2: SUPPLY & SIGNAL PROCESSING UNIT
Spectrum
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.
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.
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).
Connectors
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).
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.
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.
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
| 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) |
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