  The use of Thin-foil proton recoil (TPR) spectrometers to measure neutrons
from Deuterium-Tritium (DT) fusion plasma has been studied previously and is a
well established technique for neutron spectrometry. The study presented here
focuses on the optimisation of the TPR spectrometer configurations consisting
of dE and E silicon detectors. In addition an investigation of the
spectrometer's ability to determine fuel ion temperature and fuel ion density
ratio in ITER like DT plasmas has been performed. A Python code was developed
for the purpose of calculating detection efficiency and energy resolution as a
function of several spectrometer geometrical parameters. An optimisation of
detection efficiency for selected values of resolution was performed regarding
the geometrical spectrometer parameters foil thickness, distance from a foil to
the first detector and distance between the two detectors using a
multi-objective optimisation, a.k.a Pareto plot analysis. Moreover, the
influence of detector segmentation on spectrometer energy resolution and
efficiency was investigated. The code also produced response functions for the
two selected spectrometer configurations. The SPEC code was used to simulate
the spectrometer's performance in determining the fuel ion temperature and fuel
ion density ratio n_t/n_d. The results presented include the selected
spectrometer configuration with calculated energy resolution and efficiency.
For a selected spectrometer resolution of 5% a maximum efficiency of around
0.003% was achieved. Moreover, the detector segmentation allows for a 20%
increase in spectrometer efficiency for an energy resolution of 4.3%. The ITER
requirements for a 20% accuracy on the n_t/n_d ratio determination and 10% on
the temperature determination within a 100ms sampling window can be achieved
using a combination of several TPR's of same type, in order to boost
efficiency.
