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

作者：Morard G^*; Mezouar M; Bauchau S; Alvarez Murga M; Hodeau J L; Garbarino G

来源：Review of Scientific Instruments, 2011, 82(2): 023904.

DOI：10.1063/1.3551988

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 mu m 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 C-60 polymerization process at high pressure and high temperature.

• 出版日期2011-2