Community Research and Development Information Service - CORDIS

FP5

TECHNI Report Summary

Project ID: HPRI-CT-1999-50005
Funded under: FP5-HUMAN POTENTIAL
Country: Denmark

Adjustable radial neutron collimator

A coarse adjustable radial collimator for the RITA-2 neutron spectrometer has been designed and constructed. The RITA-2 spectrometer has a multi-blade crystal analyser and a large position-sensitive detector, giving the possibility for performing simultaneous measurements in a triple-axis geometry. In an open geometry, however, there is a risk of neutron �cross-talk� (neutrons from one analyser blade hitting the detector area corresponding to another blade). The �cross-talk� problem can be eliminated by a coarse flexible radial collimator with one vane for each analyser crystal.

A first prototype collimator was constructed and tested at SINQ, revealing a few problems. These problems were solved and a final collimator was constructed. However, the subsequent tests could not be performed within the TEHCNI project due to a long shut-down of SINQ.

The main innovation in the project was the design of the moving blades in the flexible collimator. The design can be used in connection with other neutron instruments with multiple-analyser systems. With a minor design change, a �real� radial adjustable collimator with a much tighter angular collimation could also be produced for use in e.g. strain diffractometers. Another significant progress was the identification of a generally useful multiple-analyser measuring scheme: The monochromatic imaging mode.

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Kim LEFMANN, (Senior Scientist)
Tel.: +45-46774726
Fax: +45-46775758
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