Conventional X-ray beam position monitors interrupt the X-ray beam and motorized stages are required to move them.

Thin diamond foils, on the other hand side, offer the possibility to realize transparent X-ray beam position monitors that can remain in the beam. This application takes advantage of the fact that diamond is a low-Z material, optically transparent and radiation resistant. By measuring the fluorescence light generated in the foil using a simple CCD camera both, the beam intensity, position and profile can be easily monitored.

An alternative to fluorescence screen monitors are four quadrant photo detectors. They consist of a thin diamond photodetector with four electrodes that are separated by a narrow gap. By evaluation the four photo currents the beam position can be determined with high precision.

• Specifications and options:

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  Type	Free-standing diamond fluorescence screen
  Options	Defined sub-micron surface roughness that allows light to escape the screen; High-precision reticles
  Material	Optical transparent diamond, doped for increased fluorescence yield
  Thickness	> 20 µm
  Coatings	Uncoated or AR/AR
  Size	Up to 75 mm
  Shape	rectangular, circular or elliptical