Diamond Light Source is the UK's national synchrotron light source based at Harwell. The accelerator designed by the Daresbury team has established itself as a world-class synchrotron radiation facility enabling research by leading academic and industrial groups in a wide range of disciplines.
The upgrade of Diamond to Diamond-II is a proposed facility upgrade to increase the brightness and coherence as well as providing increased photon flux at higher energies. This upgrade raises a number of opportunities for leading experts from ASTeC to contribute to the design and delivery of Diamond-II in collaboration with DLS staff.
The accelerator physics group will be investigating the dynamics of the proposed DIAMOND-II booster synchrotron. The new booster will have a significantly improved beam emittance, which can lead to instabilities in the beam dynamics during the booster ramp. We will investigate the driving forces behind these instabilities, primarily transverse and longitudinal impedances and intra-beam scattering, and their effects on the bunch properties during the ramp cycle. We will also investigate and propose potential mitigation strategies. Separately we will investigate the design and optimisation of the electron gun and linac, coupling simulation work with beam measurements of existing components.
The MaRS group is planning to lead on two challenging magnet prototypes for the Diamond-II high brightness upgrade.
The first involves assembling and testing a longitudinal gradient dipole magnet for the Diamond-II storage ring. This magnet is based on a design produced for the ESRF-EBS high brightness storage ring in Grenoble, which was successfully commissioned in 2019. ASTeC will work with Technology Department to assemble this large permanent magnet based gradient dipole, and the magnet will be tested in ASTeC's dedicated magnet measurement laboratory.
For the second prototype, the MaRS group is looking into the possibility of replacing the electromagnetic combined-function DQ magnets in the Diamond-II lattice with permanent magnet (PM) versions. We have considerable experience in this area, having produced three successful tunable PM prototypes for the CLIC project, and a fourth device is currently in the assembly and testing phase. A PM-based DQ magnet could considerably reduce the operating costs and carbon footprint of the Diamond-II facility.
The vacuum solutions group are involved in discussions around technologies to overcome the challenging vacuum design of DLS II and provide modelling and prototyping effort to the project. The technology advancement developed by ASTeC in non- evaporable getter (NEG) coatings could play a critical role in overcoming challenges such as narrow vessels and surface impedance.