Ultracold neutron facility

Performance of the neutron turbine

The figure shows time-of-flight data for the UCN turbine plotted as a function of axial velocity v using the setup shown above. The weak dependence of the UCN output on position and on angle α is typical for the turbine. The spectral cutoff depends clearly on α. The dashed-dotted curve refers to the Maxwell spectrum at the turbine blade ends (up to a lateral velocity of 6.2 m s-1).