  We report on the results of a radiation campaign with neutrons and protons of
Low Gain Avalanche Detectors (LGAD) produced by Hamamatsu (HPK) as prototypes
for the High-Granularity Timing Detector (HGTD) in ATLAS. Sensors with an
active thickness of 50~$\mu$m were irradiated in steps of roughly 2$\times$ up
to a fluence of $3\times10^{15}~\mathrm{n_{eq}cm^{-2}}$. As a function of the
fluence, the collected charge and time resolution of the irradiated sensors
will be reported for operation at $-30^{\circ}$.
