This instrument is a simple model of the thermal H8 triple-axis spectrometer
from former Brookhaven reactor. It is directly illuminated by the moderator,
and has flat monochromator and analyzer. Sample is a vanadium cylinder.
Such an instrument was used for the Monte Carlo neutron simulation package
cross comparison related in paper "A Model Instrument for Monte Carlo Code
Comparisons", Neutron News 13 (No. 4), 24-29 (2002).
Parameters in boldface are required;
the others are optional.