neutronpy.instrument.instrument.Instrument.hcol

Instrument.hcol

The horizontal Soller collimations in minutes of arc (FWHM beam divergence) starting from the in-pile collimator. In case of a horizontally-focusing analyzer hcol[2] is the angular size of the analyzer, as seen from the sample position. If the beam divergence is limited by a neutron guide, the corresponding element of hcol is the negative of the guide’s m-value. For example, for a 58-Ni guide ( m = 1.2 ) before the monochromator, hcol[0] should be -1.2.