BornAgain takes neutron polarization into account if there is magnetism in the sample model or if a polarizer is set in the instrument model.
Sample magnetization is explained in Sample model > Materials > Magnetization.
Beam polarization is set through
polarizer_vec = R3(x, y, z)
beam.setPolarization(polarizer_vec) # for scattering
scan.setPolarization(polarizer_vec) # for specular and offspec
The polarizer_vec is a Bloch vector.
If it is a unit vector, then the beam polarization is perfect.
A shorter vector indicates imperfect polarization.
The analyzer properties are through
analyzer_vec = R3(x, y, z)
detector.setAnalyzer(analyzer_vec, t_parallel, t_antiparallel) # for scattering and offspec
scan.setAnalyzer(analyzer_vec, t_parallel, t_antiparallel) # for specular
The first argument is a non-zero direction vector that specifies the analyzer orientation.
t_parallel is the probability of passing the particle with the “desired”
(or selected) spin component (along the analyzer orientation).
t_antiparallel is the probability of passing the particle with the “undesired”
(or suppressed) spin component (against the analyzer orientation).
Examples are under Examples > Instrument > Polarization.
Examples to be moved: