
Mesh Parameters
RMAX0
GENESIS 1.3 estimates the size of the grid on which the radiation field is discretized by scaling the averages size of the initial radiation field and beam size with RMAX0. The explicit size is [DGRID,DGRID] in both dimensions with DGRID = RMAX0(_{r,beam}+_{r,field}). The electron beam size is the rms sum of RXBEAM and RYBEAM while the radiation field size is calculated with ZRAYL and ZWAIST.
DGRID
Any value larger than zero explicitly sets the grid size, overruling the calculation by the RMAX0parameter.
NPTR
Number of radial grid points, on which the space charge field is evaluated. The radial axis is automatically chosen by GENESIS 1.3 to be twice as long as the maximum offset of macro particles relative to the center of the electron beam. This excludes effects of the boundary condition even for the case of narrow beams.
RMAX0SC
Explicitly defines the radial grid size for space charge calculations when set to a positive value. Otherwise, Genesis calculates the grid size from the current size of the electron beam.
ISCRKUP
If set to a nonzero value then the space charge field is updated at each of the 4 RungeKutta integration steps instead of the default behavior, where the space charge field is claculated only once before the RungeKutta integration. It increases the stability and precision of the space charge field but it comes with a cost in slower execution speed. 