# RegularizationFunction

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#### RegularizationFunction

Section Maxwell
Type integer
Default COS2

The current arising from charged point particles must be mapped onto the Maxwell propagation grid. This requires a smearing or regularization function $\phi(\mathbf{r})$ attached to each particle position $\mathbf{r}_i$ with user defined cutoff width, $\sigma$

Options:

• COS2:
$\phi(r)=\text{cos}^2(\frac{\pi}{2}\frac{|\mathbf{r}-\mathbf{r}_i|}{\sigma})$ if $|\mahtbf{r}-\mathbf{r}_i|<\sigma$, and 0 otherwise.

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