Longitudinal Phase Space Tomography Version 3

Longitudinal phase space tomography is essential in most of the CERN synchrotrons to measure longitudinal beam parameters. An implementation of phase space tomography written in Fortran95 has been used for many years, and is a vital part of the beam diagnostics in the PS Complex. To enable future developments and applications of tomography, a new version of the code was required. A fully refactored and rewritten version has been developed in mixed Python/C++, which allows more flexible and easily extended longitudinal tomography. This note gives an overview of how tomography is used to reconstruct longitudinal phase space distributions, and discusses the main differences between the original and new implementations.