Instrumented high fluence neutron irradiation test of antimony Hall sensors

Abstract Hall sensors based on antimony sensitive layer will be installed on ITER within the system of outer vessel steady-state magnetic field sensors and they are also considered for deployment on future European demonstration fusion power reactor (EU-DEMO). The role of these sensors will be to contribute to determination of the key tokamak plasma parameters such as the plasma position, shape, and plasma current. This paper presents the design of an instrumented high fluence neutron irradiation experiment, where antimony Hall sensors are exposed to the neutron and gamma radiation of the LVR-15 research reactor core (10 MW thermal). The goal of this experiment is to qualify the antimony Hall sensors for use on the EU-DEMO reactor. Initial results from the first phase of the experiment where the sensors were exposed to the fast neutron fluence ( E > 0.1 MeV) of 1.4 × 10 20 cm −2 are reported.