DESI

The Dark Energy Spectroscopic Instrument in a new multi-object spectrograph being built for the Mayall telescope, which will be able undertake a spectroscopic survey 20 times faster than the Sloan Telescope, used for the influential Sloan Digital Sky Survey. It will be used to create a galaxy survey containing 30 million galaxies forming an unprecedented large-scale structure survey, which will be cosmic variance limited out to redshift z<1.4. Percival is one of the working group chairs for this survey and a member of the DESI executive. Previously he led the UK contribution to this experiment, including managing the 5M (CAD) contribution from the UK government.