neutronpy.instrument.instrument.Instrument.vcol

Instrument.vcol

The vertical Soller collimations in minutes of arc (FWHM beam divergence) starting from the in-pile collimator. If the beam divergence is limited by a neutron guide, the corresponding element of vcol is the negative of the guide’s m-value. For example, for a 58-Ni guide ( m = 1.2 ) before the monochromator, vcol[0] should be -1.2.