Neutrons at the Institut Laue-Langevin (ILL) are delivered by its High-Flux Reactor (HFR) with a thermal power of 58.3 MW.

The High-Flux Reactor

It produces the most intense continuous neutron flux in the world in the moderator region: 1.5x1015 neutrons per second per cm2. A set of hot, thermal and cold beam-tubes and neutron guides deliver intense neutron beams at sample position.
The reactor operates continuously for 46 Equivalent Full Power Days cycles (EFPD), followed by a shutdown to change the fuel element plus one longer shutdown per year for maintenance. Normally there are 4 cycles a year, providing 225 days for science.