title: High efficiency multichannel collimator for structural studies of liquids and low-Z materials at high pressures and temperatures.
abstract: 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 C(60) polymerization process at high pressure and high temperature.
authors.affiliation: Institut de Minéralogie et de Physique des Milieux Condensés, UMR CNRS 7590, Université Pierre et Marie Curie, Université Paris Diderot, Paris, France.
authors.forename: G
authors.initials: G
authors.lastname: Morard
authors.forename: M
authors.initials: M
authors.lastname: Mezouar
authors.forename: S
authors.initials: S
authors.lastname: Bauchau
authors.forename: M
authors.initials: M
authors.lastname: Álvarez-Murga
authors.forename: J-L
authors.initials: JL
authors.lastname: Hodeau
authors.forename: G
authors.initials: G
authors.lastname: Garbarino