High efficiency multichannel collimator for structural studies of liquids and low-Z materials at high pressures and temperatures

Morard, G.; Mezouar, M.; Bauchau, S.; Álvarez-Murga, M.; Hodeau, J.-L.; Garbarino, G.
February 2011
Review of Scientific Instruments;Feb2011, Vol. 82 Issue 2, p023904
Academic Journal
A high efficiency multichannel collimator (MCC) device has been developed at the high pressure beamline ID27 of the European Synchrotron Radiation Facility to drastically reduce the x-ray background from the sample environment in the Paris-Edinburgh press. The main technical difficulty, which resides in the minimum slits size achievable using the classical mono-bloc design, has been resolved using an original concept based on a set of independent slits. Then, a very small slit size of 50 μm was manufactured resulting in a great improvement of the signal to background ratio. In addition, the transfer function of the MCC has been measured using the x-ray diffusion signal of a metal doped glass and efficiently applied to correct the raw data. The potential of this new device is illustrated in two challenging examples: iron-sulfur liquid structures and C60 polymerization process at high pressure and high temperature.


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