id summary reporter owner description type status priority milestone component resolution keywords cc workpackage 1232 canted particles in radial geometry pkienzle "In the radial geometry the beam travels through the Couette cell, scattering from both left-to-right and right-to-left flow, so the particle needs to be modeled by adding forward and reverse scattering in equal portion; this will be particularly evident for canted particles, leading to a twinned image on the detector. We should be able to handle this after the model is calculated using `I(qx, qy) + I(-qx, qy)`. This is pretty simple if the beam is centered on the detector because we can just add the computed image to its reverse. Any shift or rotation in the detector, though, makes it pretty messy. Easiest to just compute the pattern twice, once with `+qx` an again with `-qx` in that case, but this guarantees 2x cost. Otherwise we need to do a bunch of checks to select a set of qx-qy values to compute and interpolate within them for the `qx,qy` we need. " defect new major sasmodels 1.0 sasmodels SasModels Infrastructure