We want to add a more specialized programmable element that allows to input a 6x6 linear map directly from coefficients.

This is useful for custom elements and to introduce custom x-y correlations in initialized particle distributions.

Optimizations

We could let the user specify if the matrix is densely or sparsely populated (and optimize accordingly).

Background

• IMPACT-T btype=-12
• https://uspas.fnal.gov/materials/14UNM/Accel_Modeling_Lab.pdf