This is a graphic representation of a cavity-based X-ray free-electron laser. The electron beam (blue) travels through an undulator (brown and white).

In the last year, dozens of viewers contacted X-Ray about problems in their homes, which started after cavity wall insulation was fitted - from damp, mould, and rotten skirting boards to crumbling ...

X-ray pulses travel from the front cavity chamber to the back one through one pipe, then back to the front cavity through the other pipe, completing a 46-foot loop.

The X-ray-emitting binary ... describe how an X-ray binary system located about 24,000 light-years away in our Milky Way galaxy is amplifying its X-ray emission in a funnel-shaped cavity that ...

X-Ray has heard from viewers all over Wales who've experienced problems - and Welsh councils tell us 800 of their homes have been affected. In Blaenafon, Judith Hale described the problems she'd had.