Option to have fixed grid in x and y when using PIC space charge #126
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Description
A few changes in the
xfields/config_tools/spacecharge_config_tools.pyfile to have the option of a fixed transverse grid for the PIC calculations. Having a fixed grid, is sometimes desirable, for example when the beam size and shape changes considerably. With these changes, one can define a grid that fills the physical aperture.Changes made:
replace_spacecharge_with_PICI added two additional argumentsgrid_extend_in_x=None, grid_extend_in_y=None. They represent the extend of the horizontal (vertical) grid in meters in both positive and negative x-values (y-values), i.e. a fixed grid. If provided, they will be used instead of n_sigmas_range_pic_x (y) and n_lims_x (y).