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GreenC bot (talk | contribs) Rescued 3 archive links. Wayback Medic 2.5 per WP:URLREQ#google.com/patents |
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| inventor = [[Keith Symon|Keith R. Symon]]
| title = [https://archive.today/20130125112928/http://www.google.com/patents?id=ZGZVAAAAEBAJ Imparting Energy to Charged Particles]
}}</ref> Ohkawa worked with Symon and the [[Midwestern Universities Research Association|MURA]] team for several years starting in 1955.<ref>{{Cite journal | last1 = Jones | first1 = L. W. | author-link1 = Lawrence W. Jones| last2 = Sessler | first2 = A. M. | last3 = Symon | first3 = K. R. | doi = 10.1126/science.316.5831.1567 | title = A Brief History of the FFAG Accelerator | journal = [[Science (journal)|Science]] | volume = 316 | issue = 5831 | pages = 1567 | year = 2007 | pmid = 17569845| s2cid = 5201822 }}</ref>
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| d = 12
| inventor = [[Donald William Kerst]] and [[Keith Symon|Keith R. Symon]]
| title = [https://archive.today/20130102235911/http://www.google.com/patents?id=ZWZVAAAAEBAJ Imparting Energy to Charged Particles]
}}</ref> A very small spiral sector machine was built in 1957, and a 50 MeV radial sector machine was operated in 1961. This last machine was based on Ohkawa's patent, filed in 1957, for a symmetrical machine able to simultaneously accelerate identical particles in both clockwise and counterclockwise beams.<ref>{{US patent reference
| number = 2890348
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| d = 09
| inventor = Tihiro Ohkawa
| title = [https://archive.today/20130103054200/http://www.google.com/patents?id=4aEBAAAAEBAJ Particle Accelerator]
}}</ref> This was one of the first [[Collider|colliding beam accelerators]], although this feature was not used when it was put to practical use as the injector for the Tantalus [[storage ring]] at what would become the [[Synchrotron Radiation Center]].<ref>{{Cite book
| last1 = Schopper | first1 = Herwig F.
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