Editing Linear particle accelerator (section)

===Compact medical accelerators ===
The LIGHT program (Linac for Image-Guided Hadron Therapy) hopes to create a design capable of accelerating protons to 200MeV or so for medical use over a distance of a few tens of metres, by optimising and nesting existing accelerator techniques <ref>{{Cite web| url=http://cdsweb.cern.ch/record/2314160/files/frb1io02.pdf| title =LIGHT: A LINEAR ACCELERATOR FOR PROTON THERAPY}}</ref> The current design (2020) uses the highest practical bunch frequency (currently ~ 3&nbsp;GHz) for a [[Radio-frequency quadrupole]]  (RFQ) stage from injection at 50kVdC  to ~5MeV bunches,  a  Side  Coupled  Drift  Tube  Linac  (SCDTL) to accelerate from 5Mev to ~ 40MeV and a Cell Coupled Linac (CCL) stage final, taking the output to 200-230MeV. Each stage is optimised to allow close coupling and synchronous operation during the beam energy build-up.
The project aim is to make proton therapy a more accessible mainstream medicine as an alternative to existing radio therapy.