  A modern cold triple-axis spectrometer to study quantum condensed matter
systems is planned for the High Flux Isotope Reactor (HFIR) at Oak Ridge
National Laboratory. Here, we describe the conceptual principles and design of
a secondary spectrometer using a multiplexed, prismatic analyzer system relying
on graphite crystals and inspired by the successful implementation of the
Continuous Angle Multiple Energy Analysis (CAMEA) spectrometers at the Paul
Scherrer Institute. This project is currently known as MANTA for Multi-analyzer
Neutron Triple-Axis. We report Monte-Carlo ray-tracing simulations on a simple
but realistic sample scattering kernel to further illustrate the prismatic
analyzer concept's workings, calibration, and performance. Then, we introduce a
new statistical analysis approach based on the prismatic analyzer concept to
improve the number of final energies measured on the spectrometer. We also
study possible evolutions in the CAMEA design relevant for MANTA.
