Avalanche Photo Diodes
The FMB Oxford APD detector is an ultra-fast detector system, using an avalanche photo diode, for X-ray scattering experiments up to 20keV.
It offers the ultimate in speed, resolution, efficiency and noise levels whilst maintaining a robust and easy to use architecture, making it ideal for experiments with a large dynamic range, time resolved measurements and fast photon counting.
The system requires an APD detector head, signal processing electronics and a signal cable.
APD Detector Head
| APD0010 | APD0011 | |
|---|---|---|
 |  |
|
| 5mm x 5mm | 5mm x 5mm | |
| 110μm | 110μm | |
| 60mm x 30mm x 16mm body - in-air | 60mm x 30mm x 16mm body - DN16KF vacuum compatible head | |
| Be window | Be window |
Specifications
| Maximum count rate | 100MHz * |
| Diode area | 5mm x 5mm |
| Window | Beryllium |
| Housing dimensions | 60mm x 30mm x 16mm |
| Photon efficiency | 50% that of NaI up to 10keV * |
| Noise | below 1Hz * |
| Diode gain | 200x at 370V bias |
| Preamplifier gain | 60dB per stage at 100MHz |
| Rise time 10%-90% | <2ns * |
| FWHM | <4ns * |
*indicative performance figures obtained at
the National Synchrotron Light Source,
Brookhaven National Laboratory
APD Electronics
The APD Electronics package, built to a design developed at the European Synchrotron Radiation Facility offers the user maximum flexibility; it supplies the bias voltage to the detector head, and has an integrated counter/timer which can be operated in local (front panel) or remote (computer controlled) modes.
Specifications
- front panel operation through a user-friendly LCD graphic display with touch panel
- easy user interface for remote operation mode
- up to 500V diode bias
- very low noise
- rugged, reliable package
- wide dynamic range and linearity – seven decades
- LabView software is provided and can be utilised with the RS232 communication port for remote configuration and data retrieval
| NIM Module | two units wide |
| Selectable modes | local (front panel), remote |
| Remote connection | serial or parallel |
| Maximum count rate | up to 100MHz |
| HV APD biax | up to 500V |
| Remote mode | software included |
| Energy resolution | 20% to 25% at 25keV |
APD Cables
APD Cables are available in various lengths..
Ordering Info
| Item | Part Number |
|---|---|
| APD Detector Heads | |
| 5x5mm 110µm sensor, in-air | APD0010 |
| 5x5mm 110µm sensor, with KF DN16 flange, in vacuum | APD0011 |
| APD Electronics | |
| APD pulse processing unit ACE, NIM 1 channel | APD0002 |
| APD to ACE Cables | |
| APD to ACE PPU cable, 5m | CBY01501 |
| APD to ACE PPU cable, 10m | CBY01502 |
| APD to ACE PPU cable, 15m | CBY01503 |
| APD to ACE PPU cable, 20m | CBY01504 |
| APD to ACE PPU cable, 30m | CBY01505 |