Highlights of What’s New in Version 35.1.0

Here is a summary of what’s changed since release 35.0.1. Historical change logs are collected in Section 13.

The matrix for misaligned FMULT elements was incorrect. The misalignment was applied twice.
The edge effects for KQUAD were broken for tracking only in version 35.0.1. This was fixed.

The filter parameters (start_occurence, end_occurence, s_start, s_end, after, and before) of the steering_element command now work better when multiple such commands are given. In particular, overlapping intervals are detected and non-overlapping intervals are correctly implemented.

The HKPOLY element was added. It allows imparting kicks to the beam according to a Hamiltonians that are polynomial functions of (x,y) and (qx,qy). R. Lindberg (APS) helped develop the concept for this element.

The correct command has a new parameter, force_alternation that forces orbit or trajectory correction to continue with x/y alternation regardless of whether one plane appears to have converged.
The set_reference_particle_output command was added. It allows defining a reference set of particle coordinates to which tracked coordinates will be compared for purposes of optimization.
The optimization_setup command now allows setting the interval (in terms of function evaluations) between checks of the interrupt semaphore file. Previously, the file was checked only at the end of a simplex pass.