Speaker
Description
New development steps of ASCOT and AFSI (ASCOT Fusion Source Integrator) based synthetic neutron diagnostics and validation at JET are reported in this contribution. Synthetic neutron diagnostics are important not only in existing tokamaks, where they are used to interpret experimental data, but also in the design of future reactors including ITER, DEMO and beyond, where neutrons are one of the few diagnostics available. Thus development and validation of realistic synthetic diagnostics is necessary for increasing confidence in existing models and future diagnostic designs.
Recent development in AFSI includes physical improvements such as implementation of plasma rotation and reduction of the fast particle contribution in thermal reactant distribution. The rotation typically changes the beam-thermal reaction rates by 1-5%, while accounting for the fast particle density consistently decreases calculated neutron rate by up to 15% depending on the discharge.
Further developments include implementation of angular dependence of differential fusion cross sections and accounting for finite Larmor radius effect, which is important for high-energy particles such as ICRH ions. Additionally, the role of data based analysis in synthetic diagnostics development with the help of comprehensive database of JET operating conditions (JETPEAK) is discussed.
