E→B Coupling

• Eric posted analysis of beams that Karl sent. These are two orthogonal detectors at the center of the focal plane.
• He finds that, as expected, there is no Q→U coupling and no E→B coupling. So far all looks good, as expected.
• Next step: do the same for an off-axis beam.
• SH will contact Karl. The plan is to generate a 155 GHz beam at the location of the beam on the focal plane, and a ~40 GHz beam more toward the edge.
• SH will check the simulations parameters listed on the wiki.
• Kris+Jacques note that these simulations do not include sampling and time constant effects. SH says this is a second priority.
• Kris: what do the GRASP simulations include? SH: two reflectors and a stop. Don't expect shields to affect main lobe Q→U coupling. They should affect the far sidelobes.