Fixed-field alternating gradient accelerator: Difference between revisions

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FFAs use fixed magnetic fields which include changes in field direction around the circumference of the ring. This means that the beam will change radius over the course of acceleration, as in a cyclotron, but will remain more tightly focused, as in a synchrotron. FFAs therefore combine relatively less expensive fixed magnets with increased beam focus of strong focusing machines.<ref>{{cite arXiv |last=Sheehy |first=S.L. |author-link= Suzie Sheehy |eprint= 1604.05221 |title= Fixed-Field Alternating Gradient Accelerators |class= physics.acc-ph|date= April 18, 2016 }}</ref>

The initial concept of the FFA was developed in the 1950's1950s, but was not actively explored beyond a few test machines until the mid-1980s, for usage in [[neutron]] [[spallation]] sources, as a driver for [[muon]] colliders <ref name=briefhistory /> and to accelerate muons in a [[Neutrino Factory|neutrino factory]] since the mid-1990s.

The revival in FFA research has been particularly strong in Japan with the construction of several rings. This resurgence has been prompted in part by advances in [[Radio frequency|RF]] cavities and in magnet design.<ref name=mori2004>{{Cite journal