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FlatCone

A TAS option combining a set of analyzers and detectors in a very compact design. It can be installed on ILL TAS instruments IN8, IN14 and IN20.

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Description

The TAS spectrometers offer a standard for quantitative measurements, allowing detailed observations, but only measure one excitation at a time. The modern trend is to simultaneously collect as many data points as possible. This makes it possible to map substantial regions of the reciprocal space without increasing the measuring time.

FlatCone is typical of this new approach. This TAS option combines a set of analyzers and detectors in a very compact design. It can be installed on the ILL TAS instruments IN8, IN14 and IN20.

 

FLATCONE installed on IN20
It is shown here in its horizontal configuration. Tilting the multi-analyser makes it possible to collect data from reciprocal planes above the equatorial plane.
Typical signal from lattice excitations collected with FlatCone
Here in the relaxor ferroelectric PZN-8%PT at an energy transfer of 3 meV measured on IN20 (kf = 3 Å-1).

Instrument layout

The two working modes of FlatCone
One or the other analyzer set can be selected thus allowing measurements at two different kf.

FlatCone pages by A. Filhol, June 2010.