Abstract
The Diamond storage ring has recently been modified by replacing one of the original double bend achromat (DBA) cells with a double-DBA (DDBA) cell. The new cell marks a fundamental break to the machine symmetry, and the final engineered solution shares many design features in common with modern multi-bend achromat cells. In this paper we review the impact that the modification has had on the linear and nonlinear optics, collective effects, and overall performance. Where appropriate, comparison to model predictions are also made.
Highlights
The need to improve the provision of tailored, highbrightness photon beams to an ever-increasing number of experimental users has driven many of the recent developments at synchrotron radiation facilities worldwide
Third generation light sources are typically designed with a regular, periodic structure, in which cells of magnets are alternated with the straight sections that house the insertion devices (IDs)
Several light source facilities have made modifications to the lattice which break this periodicity. These range from being of relatively minor impact, to more significant modifications such as the replacement of individual dipoles with super-bends to improve the radiation spectrum [2,3,4] or the installation of double mini-beta cells to allow two small-gap insertion devices to be located in a single straight
Summary
The need to improve the provision of tailored, highbrightness photon beams to an ever-increasing number of experimental users has driven many of the recent developments at synchrotron radiation facilities worldwide. Several light source facilities have made modifications to the lattice which break this periodicity These range from being of relatively minor impact (such as the installation of high-field IDs), to more significant modifications such as the replacement of individual dipoles with super-bends to improve the radiation spectrum [2,3,4] or the installation of double mini-beta cells to allow two small-gap insertion devices to be located in a single straight. The initial concept for the DDBA cell was developed as a potential lattice upgrade for the entire Diamond storage ring [12], the primary purpose of the single-cell replacement was to create space in the centre of the arc for an additional in-vacuum ID This modification was anticipated to have a significant impact on the machine performance, constituting a fundamental break to the machine symmetry. Taking all of these factors into account, the DDBA lattice modification presents a unique opportunity to study the performance of this novel cell design, to understand how well standard modeling codes can predict the final performance of complex, nonsymmetric rings, as well as to quantify the relative impact a modern MBA cell design can have on machine impedance
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