Report on future detector requirements at ESRF

Powder diffraction in pulsed magnetic fields
Project (Former BL) Application
PMF (ID06) Powder diffraction
Aim of the detection system
The aim of the detection system is to collect photons in order to record a diffraction pattern on
powder samples. It is the third priority of the beamline, after single crystal diffraction and
high energy diffraction. It can also be used by the MagScat beamline.
Monochromatic
beam
High field
magnet
Sample
Operating conditions and specifications
Energy range:
The energy ranges from 15 to 30 keV.
Integration time:
The magnetic field pulse lasts around 30 ms and is repeated each 1 to 5 minutes. The
integration time should be 1 ms during the pulse, with few minutes of pause to save the
data.
Energy resolution:
Energy resolution is not needed.
Detector
Spatial resolution:
Spatial resolution depends on the size of the active area and of the distance to sample. In order
to probe powder and not few single crystals, the beam size is larger than 200 µm. In that
configuration, one can obtain good spatial resolution only by setting the detector far from the
sample: at least at 2 m in that case. Consequently, the detector should have an active area of
350x350 mm 2 to 500x500 mm 2 with pixels not larger than 100 to 300 µm.
Dynamic range:
A dynamic range similar or better than that of the current detector is required: 16 bits or
better.
Flux on detector:
The expected flux on detector ranges between 10 2 and 10 6 photons/s/pixel.
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