Speaker
Description
Diamond crystals are characterised by wide band gap and high binding energy,
making them suitable as solid-state particle detectors, beam-loss monitors and
dosimeters in high-radiation environments, such as particle colliders. In or-
der to use them as radiation and beam-loss monitors, our diamond detectors
are calibrated in steady conditions with different radiation sources, comparing
the measurement results with dedicated simulations. However large radiation
bursts may lead to a non-linear signal response. For this purpose we studied
their transient response to collimated, sub-picosecond, ∼ 1 GeV electron beam
bunches, with a bunch charge of tens of pC, provided by the FERMI electron
linac in Trieste. In these experimental conditions the ionisation generates large
charge carrier density in the diamond bulk. This high charge causes a transient
modification of diamond electrical properties, which affects the output signal
shape. The observed signal evolution in the time domain shows fair agreement
with a two-step numerical simulation of the diamond time response to these
intense high-energy pulses.
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