The current Polaris instrument has been operating since 2012 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. Between August 2010 and December 2011 the old Polaris instrument was dismantled and a completely new diffractometer installed in its place, with the user programme on the upgraded Polaris resuming in May 2012. Experiments have now been running successfully for over 10 years.
Polaris was instrumental in developing the instrumentation required for high pressure powder neutron diffraction measurement to 25 GPa. This programme of research was later moved to PEARL, a dedicated instrument for powder measurements at high pressure.
Follow this link for more information on the Polaris upgrade.