Photon science image sensors
Teledyne e2v offers a range of back illuminated, deep depleted, low noise CCD image sensors for use in X-ray detection at X-ray Free-Electron Laser (XFEL) facilities. These facilities produce some of the most intense electromagnetic radiations in the world which are used to investigate the microscopic world of atoms and electrons.
For soft X-rays (<3000eV) Teledyne e2v’s back thinning technology, with no anti-reflection coating significantly increases the X‐ray quantum efficiency over indirect detection methods. For this energy range the CCD262 has proven to be the preferred choice. For higher energies (X-rays between 3,000eV to 20,000eV) where indirect detection with a scintillator has normally been necessary, back illuminated HiRho CCDs can deliver high quantum efficiency for direct detection of the optical photons.
Teledyne e2v’s XFEL CCD image sensors:
|Pixel size||50 µm||50 µm||50 µm|
|Device Type||Front illuminated||Back thinned||Back thinned|
|Depletion depth||50 µm||300 µm||300 µm|
|System Noise* (ph@6keV)||0.06 –0.15||0.12 ‐0.15||0.02 – 0.037|
|Peak signal* (ph@6keV)||2500 ‐ 3000||2100||970|
|Nominal QE (%@6keV)||77||100||100|
|Nominal QE (%@12keV)||19||73||73|
|Comments||1st generation||Better QE
Lower peak signal
Application XQO, XAFS
* Noise and peak signal are given in equivalent signal from a photon with an energy of 6keV.
Further increases in pulse rates require sensors with much higher readout rates not possible with CCDs. Teledyne e2v is currently looking into the development of CMOS image sensors which can offer good radiation hardness, while maintaining a high dynamic range and very high frame rate.
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