Short Facts

• highly integrated design
• KETEK reset type preamplifier
• filtering for SDD operating voltages
• SDD operating temperature readout
• VITUS SDD sizes (7 – 50 mm²) available
• adaptable finger length
• optional Shaping Amplifier
• from 0.25 to 6µs analog shaping time
• optional ADC/MCA plus KETEK Acquisition Software (Windows XP)

Complete Digital System including DPP

Throughput: The diagram provides the throughput behaviour of the AXAS-D. It shows the dependency of the output count rate with the input count rate for different digital peaking times. The lower the peaking time, the higher is the maximum throughput for a system.

Energy Resolution with Input Count Rate: The energy resolution of the digital system is mostly 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 digital peaking times.

Peak Position: The graph shows the independency of the peak position of the Mn-Ka line with the input count rate for different digital peaking times.

DPP Block Diagram: The Block Diagram shows the principle of operation of the Digital Pulse Processor (DPP). The main clock frequency is 25MHz, using a 12-bit ADC at 40MSPS. It has both an analogue gain before digitizing and a digital gain right after the digital filtering, which consists of digital shaping a digital Baseline Restoration (BLR), a Peak Detection and a digital Pile-Up Rejector (PUR). Also the SDD operating parameters can be set and read by an additional ADC in combination with a SPI Interface. The DPP is FPGA based and uses USB 2.0 Interface.

AXAS-D Operation Block Diagram: The diagram shows the principle of operation of the AXAS-D. It consists of a Low voltage Power supply for 3.3 and 1.2V, a thermoelectric cooler controller for the SDD Peltier, a high voltage (-180VDC) power supply, a sensor parameters control and measurement unit, the preamplifier and the Digital Pulse Processor (DPP) itself. It provides an overvoltage and polarity reversal protection. Connectors are USB 2.0, a Lemo Coax Preamplifier Output and for the SDD.

All AXAS have compact aluminium 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.

Available options for AXAS-D:

• DLL
• Protection Caps