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College Park, Maryland      June 6 - 10 , 2004

TP31: Concept and performance of the TOF strain scanner POLDI with multiple frame overlap

U. Stuhr, W. Wagner (Paul Scherrer Institut, 5232 Villigen-PSI, Switzerland)

POLDI is a new neutron diffraction instrument at the Swiss continuous spallation neutron source SINQ at PSI, primarily dedicated to residual stress investigations. The instrument has realized a novel type of time-of-flight (TOF) diffractometer allowing multiple frame overlap. Besides for the benefit of higher intensity (as compared to a conventional single-pulse mode), this concept allows an independent tuning of intensity and resolution, an immense advantage for a flexible adjustment to dedicated experiments. The concept makes use of the mutual dependence of the neutronís arrival time at the detector and the related scattering angle to assign the neutrons to the originating pulse at the chopper. The principle concept of the instrument, some special components, and the performance in terms of intensity, resolution and flexibility for strain mapping and structure analysis will be presented.

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