Test2d23 23rd benchmark test' data file for CPO2D
Non-xz-plane motion, planar symmetry.
The option for non-xz-plane rays in a planar 2D system is illustrated, using an ideal cylindrical analyser. Here 'planar' symmetry is used, so that the system extends an infinite distance in the +/- y directions. The electrodes are specified as arcs of circles that subtend 90 degrees. After reflection in the x=0 and z=0 planes these become full circles. With the planar symmetry they becomes cylinders of infinite length.
In the usual planar motion the particles are assumed to move in the xz plane, with a zero velocity in the y direction. On the other hand in the present option the particles are allowed to have a non-zero velocity in the y direction. The velocity is constant for non-relativistic energies.
This type of motion can of course be treated by CPO3D, but there are sometimes advantages in using the present option in CPO2D when the system of electrodes has planar (or near_planar) symmetry.
Comments on the use for relativistic energies are included at the end of the data file.
Note that the option cannot be combined with the options for entering total energy, or using variable mass, time dependence, use saved trajectories or focus iterations.
See also general note on symmetries.