The Kent State University Neutron Polarimeter was located at 
meters from the target on the 
flight path. The design of the
KSU detector (also called the ``
'' polarimeter) is significantly
different than that of the INPOL detector but
it measures both particle energy and polarization in essentially the same
way. Neutron energy is measured by time-of-flight and the polarization by
measuring the azimuthal distribution of a second scattering. A schematic
drawing of the KSU ``
'' polarimeter is shown in figure 
Figure: The KSU ``
'' polarimeter: a) Isometric view, b) Side view
[Wat94].
The analyzer for the ``
'' polarimeter consists of 4 blocks of BC-404
plastic scintillator, each 
,
situated with the long axis along the neutron's direction of motion. The
neutrons will scatter into an azimuthally symmetric array of twelve
BC-400 plastic scintillators, each
. The angle between the
centers of the front and back planes is 
which is near the
maximum ``figure-of-merit'' 
for elastic neutron-proton
scattering in the energy range of 100-200 MeV as can be seen in figure
.
Figure: Calculated figure-of-merit for n-p elastic scattering at
MeV. Maximum FOM is at 
[Wat94].
Each of the bars of scintillator has a phototube (XP-2020 for the front
plane, and XP2041 or R-1250 on the back plane) at each end.
Therefore position of the interaction is determined by a timing difference
between each end. The intrinsic time resolution for the detector is given
as 122 ps (FWHM), and the position resolution is 17 mm (FWHM). In a 1995
calibration an overall time resolution of 360 ps was observed, which, for
170 MeV neutrons, corresponds to an energy resolution of 580 keV at a
flight path of 50 meters. Further
details on the KSU ``
'' polarimeter can be found in [Wat94] and
[Pal95].