Updates to the MAX IV 3 GeV Storage Ring Lattice
Last revised: June 12, 2012
The optics for the MAX IV 3 GeV storage ring have been modified and the official lattice has been updated. The new 20110117 branch [1] will replace the previous 20101101 branch. The optics change has resulted from the requirement to match to a greater number of strong IDs than originally foreseen as well as operational concerns regarding powering of the pole-face strips (PFSs). Additionally, a new matching method is applied so that the powering of PFSs in the dipoles does not need to be varied whenever strong ID gaps change. Although it appears only minor changes to the linear optics were applied, the vertical tune has been shifted by two integers which entails a significant change of vertical chromaticity and hence modifications in the nonlinear correction scheme. This document describes the linear and nonlinear optics changes, presents the new ID matching technique and required tuning range, and summarizes all other modifications to the official lattice. A list of current official lattice files and their purpose is appended.