  We optimize the third-generation gravitational-wave detector to maximize the
range to detect core-collapse supernovae. Based on three-dimensional
simulations for core-collapse and the corresponding gravitational-wave waveform
emitted, the corresponding detection range for these waveforms is limited to
within our galaxy even in the era of third-generation detectors. The
corresponding event rate is two per century. We find from the waveforms that to
detect core-collapse supernovae with an event rate of one per year, the
gravitational-wave detectors need a strain sensitivity of
3$\times10^{-27}~$Hz$^{-1/2}$ in a frequency range from 100~Hz to 1500~Hz. We
also explore detector configurations technologically beyond the scope of
third-generation detectors. We find with these improvements, the event rate for
gravitational-wave observations from CCSN is still low, but is improved to one
in twenty years.
