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Diamond
exhibits a bunch of unique
properties such as extreme hardness,
high thermal conductivity and
chemical inertness. In terms of
X-ray windows another property of
diamond is of crucial importance:
diamond consists of carbon i.e.
diamond is a low Z material which is
transparent to X-rays.
In synchrotron accelerators the
white-beam X-ray window is subjected
to a high thermal load due to the
absorption of low energy X-rays. In this
context the unique thermal conductivity
of diamond is of central importance. By
appropriate edge cooling techniques CVD diamond window can handle much
higher power levels as compared e.g.
to beryllium. In addition CVD
diamond is a non-toxic material
facilitating the safety requirements
during operation.
High transmission coefficients even
at low X-ray energies can be achieved by
using thin diamond membranes mounted on
circular silicon support disks. The
thickness of these membranes can be as
low as 1 µm. The free aperture
depends on the maximum pressure
difference the window must be able to
handle.
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Specifications and available options: |
| Size |
2-20 mm free aperture
(typical: 4-10 mm) |
| Design |
Efficient water cooling
jacket;
UHV compatible;
bakeable to up to 250°C;
custom design |
| Thickness |
Thickness 20 – 300 µm (UHV
compatible)
or 1-50 µm for O-ring sealing |
| Material |
CVD diamond, optical
grade |
| Surface |
Polished, surface
roughness < 10 nm rms |
| Shapes |
Circular or oval free
aperture |
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