Polaris

Medium resolution powder diffraction

This instrument is operational,in user programme .

Design drawing of the upgraded Polaris diffractometer

Design drawing of the upgraded Polaris diffractometer
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Polaris has now been rebuilt following a major upgrade funded by the CCLRC/STFC Facilities Development Fund and the Swedish Vetenskapsrådet Research Council, and with in-kind contributions from The Basque Country, Spain.

In May 2012 the Polaris User Programme resumed, and the first experiments have now been completed successfully.

Latest News (June 2012)
Manufacture of the radial collimator is complete and it will be fitted in the Polaris sample tank prior to ISIS cycle 2012/2 which starts in July 2012.

Follow this link for more information on the Polaris upgrade

Follow this link for a picture of the first diffraction patterns collected on the upgraded Polaris

POLARIS is the ideal complement to high resolution powder diffractometer HRPD. Its strengths lie in the rapid characterisation of structures, the study of small amounts of materials, the collection of data sets in rapid time and the studies of materials under non-ambient conditions.

The Polaris instrument at ISIS is a high intensity, medium resolution powder diffractometer. It is optimised for the rapid characterisation of structures, the study of small amount of materials (as little as ~1mm3), the collection of data sets in rapid time (with data collection times down to ~5 minutes) and the study of materials under non-ambient conditions, where the ability of time-of-flight powder diffraction to collect an entire diffraction pattern at a single, fixed scattering angle is a very powerful attribute. In particular, detector banks allow studies of samples within complex sample environment equipment, such as high pressure cells or reaction vessels.

Polaris is routinely used in structural studies of zeolites, for real time in situ studies of structural changes in industrially important materials such as batteries and toughened ceramics, and has been instrumental in allowing the development of high pressure powder neutron diffraction to 25 GPa and beyond.

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