Vitus H15LE
15 mm2 SDD with
AP3.3 Low-Energy Window
X-ray Silicon Drift Detector
for Low-Energy
XRF – EDX – TXRF Applications
Unique FeatureS
- Large area low-energy module
- Ultra thin polymer window
- Sensitive down to Boron K at 185eV
Key Parameters (Guaranteed Values) | ||
Class | Premium | Standard |
FWHM Mn K (5.9 keV) | ≤ 136 eV | ≤ 144 eV |
FWHM C K (277 eV) | ≤ 70 eV | ≤ 80 eV |
Peak to Background | > 10000 | > 6000 |
Peak to Tail | > 2000 | > 1000 |
Absorption depth | 450 µm Si | |
Peak shift stability up to 100 kcps | < 1eV | |
Max. input countrate | 500 kcps | |
Windows | AP3.3 Polymer | |
Cooling performance | ∆ > 55K | |
On-chip collimator | Zr | |
Ordering codes | V450H15-ZR3LE 136 | V450H15-ZR3LE 144 |
Table 1: Beyond the guaranteed minimum key parameters shown in the table above, typical energy resolution of a Premium Class VITUS H15LE SDD is better than 129eV. P/B is typically greater than 18,000.
Spectrum
Figure 1: The spectrum has been acquired in KETEKs standard end qualification test stand with an Fe-55 source using an XIA Mercury signal processing unit. The input count rate has been 10 kcps at a measurement time of 500s. The spectrum shows a very good energy resolution for Mn-Ka and an excellent peak-to-background ratio.
Energy Resolution
Figure 2: The energy resolution of the VITUS H15LE is dependent on both, the peaking time and the operating temperature. Depending on the application the best performance can achieved by an appropriate selection of peaking time and set operating temperature.
Figure 3: The VITUS H15LE shows excellent energy resolution stability for different input count rates up to reasonable deadtimes at each peaking time. The data was measured at optimum cooling with an Fe-55 source using an XIA Mercury signal processing unit.
Operation Requirements
SDD Voltages and Currents | ||
Ring1 (R1) | -20 V ± 5 V | 10 µA typ. |
RingX (RX) | -130 V ± 20 V | 10 µA typ. |
Back | -60 V ± 5 V | <1 nA |
Included FET | ||
Drain | 3 V ± 0.5 V | 3 mA |
Source | 0 V | |
Bulk | -5 V ± 3 V | |
Reset | 1 V | 1 µs |
Feedback | ramped output |
Peltier Element | 4.0 V | 1 A max |
Temperature Monitor | slope 2.40 mV/K 520 mV @ +20 °C | 1 µA |
Pin Assignment and Geometry
Figure 4: Pin Assignment and Geometry
Operation – Easy to Use
- Pin wiring according VITUS Operation Block Diagram
- Detector operating voltages should be RC low-pass filtered and linearly regulated (KETEK electronics recommended)
- KETEK reset type charge sensitive pre-amplifier with internal triggered reset pulses recommended
- Short wiring length between detector and pre-amplifier recommended
- Detector may only be operated with an appropriate heat sink
Available Signal Processing Electronics and Accessories
- AXAS-A
- AXAS-D
- AXAS-M
- Pre-amplifier
- Digital Pulse Processor (DPP)
- Clip-on protection cap with external multilayer collimator
