Annual Review 2024-2025

D I A M O N D L I G H T S O U R C E L I M I T E D 47 D I A MO N D - I I U P D AT E Construction of the first Diamond-II insertion device, a cryogenic permanent magnet undulator (CPMU) for the VMXm (K02) beamline, is underway (see Fig. 1). The design of this device is different to previous CPMUs constructed for Diamond. CPMU-6 will fit in a new mid-straight hence is shorter than CPMUs 1 to 5 which are located in standard straights. As a result, a new ID structure design was required, and we took the opportunity to incorporate lessons from the earlier IDs. The new structure is all-welded, rather than bolted together, making it stiffer and cheaper to manufacture. Magnet beams fit straight onto the new design in hours rather than several days for the older design. The first pre-series magnets for Diamond-II have reached the factory acceptance testing stage to verify their performance before committing to the full series production. Figure 2 shows a sextupole magnet after its factory acceptance test. Figure 1: Start of assembly of the first Diamond-II insertion device. Initial assembly and first stage motion testing are carried out with the device ‘on its back’. Buildings and infrastructure The DEB is progressing as we work towards completion in the summer of 2025, followed by Diamond’s own fit out of laboratories, offices and meeting rooms. Figure 2: The first completed pre-series electromagnet for Diamond-II. Figure 4: The high voltage substation The DEB 20 tonnes crane has been installed, bridge connection works are well underway, external cladding is now complete, primary plant such as chillers/AHU’s have been delivered. The liquid nitrogen connection into Synchrotron main liquid nitrogen ring main has now been completed and awaits the second phase of installation to be run externally to the DEB. The DEB and the future 1 MW Data Centre will have a new dedicated High Voltage (HV) Substation nestled into Diamond’s HV Outer Services Ring circuit delivering in excess of 3 MW of power. The high voltage cables have been pulled across the synchrotron perimeter road to the DEB and the jointing was completed by the end of March 2025. Figure 3: A view of the DEB from the synchrotron building