>How much dangerous are the neutrons from such device?
Fusion neutron (14 MeV) from fusion reactor is exactly as energetic as fusion neutron emitted by a neutron bomb and causes equal damage (just distributed over longer time). They have 10x as much energy as fission neutrons and travel at speed of 52,000 km/s (17.3% of the speed of light). Neutron capture before they hit and damage magnets, electronics or wear out materials is important part of the fusion reactor design.
This is a DD machine. Neutron energies from the primary reaction are comparable to fission neutrons, 2.4 MeV. There will be some from secondary DT reactions, which are 14 MeV, but the bulk of the neutron production will be at the lower energy.
Fusion neutron (14 MeV) from fusion reactor is exactly as energetic as fusion neutron emitted by a neutron bomb and causes equal damage (just distributed over longer time). They have 10x as much energy as fission neutrons and travel at speed of 52,000 km/s (17.3% of the speed of light). Neutron capture before they hit and damage magnets, electronics or wear out materials is important part of the fusion reactor design.