Fixed-field alternating gradient accelerator: Difference between revisions

Revision as of 00:33, 25 April 2019

Revision as of 13:25, 25 April 2019

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}}</ref><ref>{{cite journal|title=Fourth Accelerator Meeting for the EPNS|journal=European Particle Accelerator Conference|date=24 March 1992|first=E.|last=Zaplatin}}</ref>

The first proton FFA was successfully construction in 2000,<ref>{{cite journal|author=M. Aiba|display-authors=etal|title= Development of a FFAG Proton Synchrotron|journal=European Particle Accelerator Conference|year=2000|access-date=}}</ref> initiating a boom of FFAGFFA activities in [[Particle physics|high-energy physics]] and [[medicine]].

With [[superconducting magnets]], the required length of the FFA magnets scales roughly as the inverse square of the magnetic field.<ref name=mewu>{{Cite journal

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==Scaling vs non-scaling types==

The magnetic fields needed for an FFA are quite complex. The computation for the magnets used on the Michigan FFA Mark Ib, a radial sector 500&nbsp;keV machine from 1956, were done by Frank Cole at the [[University of Illinois]] on a [[mechanical calculator]] built by [[Friden, Inc.|Friden]].<ref name=JonesTerwilliger /> This was at the limit of what could be reasonably done without computers; the more complex magnet geometries of spiral sector and non-scaling FFAGsFFAs require sophisticated computer modeling.

The MURA machines were scaling FFA synchrotrons meaning that orbits of any momentum are photographic enlargements of those of any other momentum. In such machines the betatron frequencies are constant, thus no resonances, that could lead to beam loss,<ref>