RectangularGrid

class marxs.design.rowland.RectangularGrid(**kwargs)

Bases: ElementsOnTorus

A collection of diffraction gratings on the Rowland torus.

This class is similar to marxs.design.rowland.GratingArrayStructure but instead of placing elements on concentric circles, they are placed to fill a rectangular area.

When initialized, it places elements in the space available on the Rowland circle, most commonly, this class is used to place grating facets.

After generation, individual facet positions can be adjusted by hand by editing the attributes elem_pos or elem_uncertainty. See marxs.simulation.Parallel for details.

After any of the elem_pos, elem_uncertainty or uncertainty is changed, generate_elements needs to be called to regenerate the facets on the GAS.

Parameters

y_range, z_range: list of two floats

Limits of the rectangular area where gratings are placed. To place only one element, make both limits the same, e.g. z_range=[5, 5] will place one element in each row in z centered on $z=5$. This is given in the coordinate system of the torus, i.e. y is the plane of the Rowland circle and both numbers are measured from the center of the Rowland torus. Default for z-range: [-1e-10, 1e-10]. This will make one element centered on 0 in z-range.

Define a new MARXS element.

Methods Summary

elemposyz()

Specify the element position in the yz plane

Methods Documentation

elemposyz()

Specify the element position in the yz plane

For the torus, the Rowland circle lies in the xy plane and the symmetry axis of the torus is the y-axis. In this class, the position of the elements is specified in the yz plane in the coordinates of the torus and the remaining coordinate.

This function will be customized by derived classes.

Returns

ypos, zposnp.array

1D arrays of y and z positions for the elements distributed in 2D.