The neutron flux monitor for equatorial port 07 is the first of four NFMs planned for the ITER machine. Highly sensitive, it will be used during the early deuterium phase of operation and for initial tritium operation to measure low/medium fusion power levels. Three similar systems are planned at equatorial port 01 for low fusion power measure during the deuterium phase and equatorial ports 08 and 17 for high-power measurement during full tritium operation.
The three sensors of the neutron flux monitor (equatorial port 07) are approximately 20 centimetres from the vacuum vessel. The electronic pulse induced in the fissionable material by one neutron will be transmitted along the pipes (in red), and acquired for data analysis.