Combined Function Magnet

[ax3l]

We received an email request for a combined function magnets (a dipole or “SBEND” with a quadrupole strenght associated with) and will also require such an element to model ALS-U.

MAD-X has this as a a quadrupole field that one can set to a dipole.

After a first discussion, we could implement this as:

1. linear version
2. w/ non-linear elements through symplectic integration

[cemitch99]

Item 1. (linear version of the combined function bend) is addressed in PR #387.