Speaker
Description
Materials degradation due to radiation damage is the limiting factor for the lifetime and efficiency of high power spallation targets, as well as of their beam instrumentation. In this presentation, firstly, the beam instrumentation devices for the European Spallation Source (ESS) target monolith will be described, namely:
- The target imaging system for measuring the 2D current density distribution, based on optical components and luminescent coating which is exposed to challenging current densities and surface temperatures;
- The aperture monitors, including thermocouple assemblies and secondary emission blades, severely affected by the exposure to mixed irradiation fields;
- The multiwire grids, meant to measure two orthogonal 1D projected profiles of the beam in the vicinity of the ESS target.
Secondly, the results of MCNP simulations and tests of components performance (with protons of 7 MeV at DTU and of 400 MeV at J-PARC) will be summarized.
It is foreseen that further tests at HiRadMat would allow to investigate the impact of thermal shock loads and consequently improve cooling systems. In addition, online density measurements techniques, relevant for MPS, could be investigated so that the detection of errant beam conditions would suppress the beam production on a sufficiently fast time scale to minimize component damage.