  The proven radiation hardness of silicon 3D devices up to fluences of $1
{\times} 10^{17}$ $n_{eq}/cm^{2}$ makes them an excellent choice for next
generation trackers, providing < 10 ${\mu}m$ position resolution at a high
multiplicity environment. The anticipated pile-up increase at HL-LHC conditions
and beyond, requires the addition of < 50 ps per hit timing information to
successfully resolve displaced and primary vertices. In this study, the timing
performance, uniformity and efficiency of neutron and proton irradiated single
pixel 3D devices is discussed. Fluences up to $1 {\times} 10^{17}$
$n_{eq}/cm^{2}$ in three different geometrical implementations are evaluated
using 120 GeV SPS pion beams. A MIMOSA-26 type telescope is used to provide
detailed tracking information with a ~ 5 ${\mu}m$ position resolution.
Productions with single- and double-sided processes, yielding active
thicknesses of 130 and 230 ${\mu}m$ respectively, are examined with varied
pixel sizes from $55 {\times} 55$ ${\mu}m^{2}$ to $25 {\times} 100$
${\mu}m^{2}$ and a comparative study of field uniformity is presented with
respect to electrode geometry. The question of electronics bandwidth is
extensively addressed with respect to achievable time resolution, efficiency
and collected charge, forming a 3D phase space to which an appropriate
operating point can be selected depending on the application requirements.
