and a high energy transfer line. The LINAC was operated for over 30 years as part of the Saskatchewan Accelerator Lab and operates at 2856 MHz. The 78m low energy transfer line takes the electrons from the below-ground LINAC to the ground level booster in the newer CLS building, via two vertical chicanes. The full energy 2.9 GeV booster, chosen to give high orbit stability in the storage ring, operates at 1 Hz, with an RF frequency of 500 MHz, unsynchronised with the LINAC. This results in significant beam loss at the extraction energy. Storage ring The storage ring cell structure has a fairly compact lattice with twelve straight sections available for injection, RF cavities and 9 sections available for insertion devices. Each cell has two bending magnets detuned to allow some dispersion in the straights – the so-called double-bend achromat structure – and thus reduce the overall beam size. As well as the two bend magnets each cell has three families of quadrupole magnets and two families of sextupole magnets. The ring circumference is 171m, with a straight section length of 5.2m. The CLS is the smallest of the newer synchrotron facilities, which results in a relatively high horizontal beam emittance of 18.2 nm-rad. The CLS was also one of the first facilities to chicane two undulators in one straight section, to maximize the number of insertion device beamlines. All five of the phase I X-ray beamlines use insertion devices. Four use permanent magnet undulators designed and assembled at the CLS, including one in-vacuum undulator and one elliptically polarized undulator (EPU). The HXMA beamline uses a superconducting wiggler built by the Budker Institute of Nuclear Physics in Novosibirsk. Phase II added two further devices including another Budker superconducting wiggler, for the BMIT beamline. Phase III will add four more devices, filling 8 of the 9 available straight sections. Longer term development includes the replacement of two of the phase I undulators with elliptically polarizing devices. Since 2021, the ring operates in a top-up mode during normal user operations, injecting every few minutes to maintain a stable ring current just below 220 mA. Prior to this change, the ring operated with a fill current of 250mA in decay mode, with two injections per day. Facility status is shown on a "machine status" webpage, and using the CLSFC account on Twitter. Superconducting RF cavity The CLS was the first light source