The triple axis neutron spectrometer PUMA (FRM II) amd its application for the investigation of solid state materials

Klaudia Hradil (Garching, Germany)

The triple axis neutron spectrometer PUMA (FRM Il) and its application for the investigation of solid state materials K. Hradil, Heinz l\/leier-Leibnitz neutron source (FRM ll), Garching, Germany The triple axis spectrometer PUMA is situated at the Heinz Maier-Leibnitz neutron source (FRIVI ll). It was set into operation during 2006 for the basic single detector version and is now available to the user community within the proposal system of the FRIVI ll. The main characteristics of the instrument can be summarized as follows: high neutron flux on sample position concomitant with a low background; flexible and straightforward change of components as collimation, monochromators/analyzers; Eulerian cradle for flexible scattering plane adjustment; diverse and powerful sample environment. The wide range of applications of the instrument covers beside the study of phonon and magnon dispersion curves also the study of diffuse scattering, critical phenomena, soft-mode phase transitions, anharmonical effects or direction dependent quasi-elastic scattering. A salient feature of PUMA is the stroboscopic measurement technique implemented within the instrument control opening the possibility to perform kinetic real time investigations of reversible processes in dependence of an external field also on weak excitation signals. A highly flexible multianalyzer/-detector option was recently commissioned, which allows survey measurements in (Q, oo) - space and provides in combination with a time-resolved counter electronics new opportunities for single shot real time investigations. Within my talk I will introduce the characteristics and the applications of the instrument exemplified by selected measurements.

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