The Fourth Generation Light Source (4GLS) was a project to propose and design an advanced light source to meet the needs of the UK and European low photon energy community. The facility design included three separate FELs, operating in the IR, VUV and XUV, and multiple spontaneous undulator sources, all driven by superconducting and energy recovery linac technology. The very short (sub ps) output from these sources could be combined in multicolour pump-probe experiments.
The MaRS Group designed the free-electron lasers and spontaneous undulator sources, as well as working on studies of the wakefields induced by the interaction between the short electron bunches and the vacuum vessel walls.
Jim Clarke, David Dunning, Duncan Scott, Neil Thompson