Highlights of What’s New in Version 28.0.0, 18 June 2015

Here is a summary of what’s changed since release 27.1.0:

The WATCH element was improved so that the dCt column (in parameter or coordinate mode) and dt column (in coordinate mode) no longer exhibit fictitious drift due to precision limitations in simulations of rings with many turns.
For numerical reasons, any CSBEND with ρ > 10⁶ m is replaced with another element. In the past, an EDRIFT was used, which would produce incorrect results if the element had non-zero K₁ or K₂. This was fixed.

The TFBPICKUP and TFBDRIVER elements, which provide a turn-by-turn feedback capability, now support multi-bunch feedback. In addition, support was added for longitudinal feedback as well as sample/update intervals greater than one turn.
The CSRDRIFT element can now also include longitudinal space charge, using the algorithm from the LSCDRIFT element.
The CSBEND element has a new feature that allows suppression of spurious trajectory offsets that result from limitations of the symplectic integration routine. This feature is controlled using the REFERENCE_CORRECTION parameter.
The input of multipole errors for KQUAD and KSEXT elements was modified so that the input columns have more transparent names. Previously, the names caused some confusion. Files that worked with previous versions are still accepted.
The MARK element with FITPOINT=1 now stores the emittances of the three modes as e1m, e2m, and e3m for optimization if moments_output is invoked. This deficiency was pointed out by forum user marlibgin.

The transmute_elements command now does a better job of copying common parameters between the old and new element types. In the past, only the length was preserved. A. Zholents (ANL) reported this issue.
The floor_coordinates command has a new parameter, store_vertices, which allows requesting that dipole vertex points be stored for use in optimization.
The twiss_output command now stores the acceptances Ax and Ay for use in optimization.