  This paper describes a novel directional neutron detector prototype. The low
pressure time projection chamber uses a mix of helium and CF4 gases. The
detector reconstructs the energy and angular distribution of fast neutron
recoils. This paper reports results of energy calibration using an alpha source
and angular reconstruction studies using a collimated neutron source. The best
performance is obtained with a 12.5% CF4 gas mixture. At low energies the
target for fast neutrons transitions is primarily helium, while at higher
energies, the fluorine contributes as a target. The reconstruction efficiency
is both energy and target dependent. For neutrons with energies less than 20
MeV, the reconstruction efficiency is ~40% for fluorine recoils and ~60% for
helium recoils.
