  Single-crystal synthetic diamond sensors have been widely used in radiation
dosimetry and beam diagnostics. The foreseen harsh radiation environment in
electron-positron colliders at the luminosity frontier requires a thorough
investigation of diamond's response to large radiation burst, in particular, to
intense high-energy electron pulses. In this article, a two-step numerical
simulation approach (Sentaurus~+~LTspice) is proposed to explore this topic.
Time response of the diamond detector is simulated via TCAD-Sentaurus while the
transmission effect of the electronic circuit is taken into account using
LTspice. Good agreement is observed between results of the numerical simulation
and preliminary experimental data from detector's exposure to high-energy
sub-picosecond electron pulses, on both the amplitude and the shape of the
induced signals. This simulation combination is a novel approach to designing
and optimising diamond detectors for radiation and beam loss monitoring in
particle physics experiments.
