AXAS-D
Digital system with VITUS SDD, reset type low-noise preamplifier, high performance DPP and all power supplies in compact housing.
Unique Features
Detector sizes from 7 mm² to 50 mm²
- Customized finger length available
Highly integrated design
- Filtering for SDD operating voltages
SDD operating temperature readout
Analog and digital outputs available
High performance Digital Pulse Processor DPP2
USB2.0 and RS232 interface
Peaking times from 0.1 µs to 24 µs
Spectrum
Figure 1: Typical Fe-55 spectrum of a 30 mm² KETEK VITUS SDD in AXAS-D, taken with KETEK DPP2 at 1 µs peaking time.
Throughput
Figure 2: The diagram provides the throughput behavior of the AXAS-D. 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 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 peaking times. Acquired with KETEK DPP2.
Connectors
Figure 5: The backplane of the AXAS-D with all available connectors is shown. For the operation a ±12 V power supply is needed. The analog and digital outputs can be operated simultaneously.
Geometries
Figure 6: All AXAS have compact aluminum housings plated with Nickel. All screws are stainless steel and the systems can be fixed to a plate by using M3 screws. The mounting plates are compatible for all AXAS.
Analog Output Signal
Figure 7: The AXAS-D is equipped also with an analog output which can be used together with the digital output simultaneously. The shape of this analog output signal (ramped reset type) is shown on the graph. The ramp amplitude is approx. 3 V.
Figure 8: 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 | ±12 VDC; KETEK APS-L 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 | Digital interfaces | USB 2.0, RS232 (on request) |
| Vacuum tightness | Optional; He leakage rate <10-6 mbar · l/s | 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 |
| H7 | ≤ 133 eV | 50, 100 (standard), 160, 200 | Yes (optionally) |
| H20 | ≤ 133 eV | 50, 100 (standard), 160, 200 | Yes (optionally) |
| H30 | ≤ 133 eV | 50, 100 (standard), 160, 200 | Yes (optionally) |
| H50 | ≤ 133 eV | 50, 100 (standard), 160, 200 | Yes (optionally) |
| H7LE* | ≤ 133 eV | 50, 100 (standard), 160, 200 | Yes (optionally) |
| H20LE* | ≤ 133 eV | 50, 100 (standard), 160, 200 | Yes (optionally) |
Related Products
EMLCOL
External multilayer collimator to protect the SDD’s entrance window
APS-L
Linear regulated power supply for use with KETEK X-Ray Acquisition Systems
Vacuum Flange
Customized welded vacuum flanges available on request