Editing Canadian Light Source (section)

==== Superconducting RF cavity ====
The CLS was the first light source to use a [[Superconducting radio frequency|superconducting RF (SRF) cavity]] in the storage ring from the beginning of operations.<ref name="SRNupdate" /> The [[niobium]] cavity is based on the 500&nbsp;MHz design used at the [[Cornell Electron Storage Ring]] (CESR) which allows potentially beam-perturbing high order modes to propagate out of the cavity where they can be very effectively damped.<ref name="PAC2001" />  The superconducting nature of the niobium cavity means only 0.02% of the RF power put into the cavity is wasted in heating the cavity as compared to roughly 40% for normal-conducting (copper) cavities.  However, a large portion of this power saving - about 160&nbsp;kW out of the 250&nbsp;kW saved - is needed to power the cryogenic plant required to supply liquid helium to the cavity.  The SRF cavity at CLS is fed with RF from a 310&nbsp;kW Thales klystron.