The new quasi-Laue Diffractometer at the Replacement Research Reactor

Wim T. Klooster

Bragg Institute, ANSTO, PMB 1, Menai, NSW 2234, Australia (wim@ansto.gov.au)

The new single-crystal diffractometer for the Replacement Research Reactor will be a quasi-Laue diffractometer, similar to VIVALDI at ILL, France. It will be competitive with the best instruments currently available. Data collection times for a normal structure determination will be less than a day, a considerable improvement on current data collection times, typically a few weeks at HIFAR. Also, the crystal size needed for an experiment can as small as about 0.1 mm³, opening up new research areas where it has proved difficult to grow crystals sufficiently big (several mm³) which are currently needed. Another area of research opening up will be multiple temperature and/or pressure measurements.

This new instrument will be a useful tool to obtain structural information in a timely fashion, where x-rays do not provide enough detail.

The instrument will be on the end of a thermal supermirror guide, and we are exploring the possibility of enhancing the flux further by using a converging guide section immediately before the instrument itself.

More detailed information on the instrument will be presented.