The development of an annular-beam, high power free-electron maser for future linear colliders

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Work is under way to develop a 17 GHz free electron maser (FEM) for producing a 500 MW output pulse with a phase stability appropriate for linear collider applications. We plan to use a 500 keV, 5 kV, 6 cm diameter annular electron beam to excite a TM{sub 02} mode Raman FEM amplifier in a corrugated cylindrical waveguide. The annular beam will run close to the interaction device walls to reduce the power density in the fields, and to greatly reduce the kinetic energy loss caused by beam potential depression associated with the space charge which is a significant advantage ... continued below

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6 p.

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Fazio, M.V.; Carlsten, B.E.; Earley, L.M.; Fortgang, C.M.; Haddock, P.C. & Haynes, W.B. September 1, 1996.

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Description

Work is under way to develop a 17 GHz free electron maser (FEM) for producing a 500 MW output pulse with a phase stability appropriate for linear collider applications. We plan to use a 500 keV, 5 kV, 6 cm diameter annular electron beam to excite a TM{sub 02} mode Raman FEM amplifier in a corrugated cylindrical waveguide. The annular beam will run close to the interaction device walls to reduce the power density in the fields, and to greatly reduce the kinetic energy loss caused by beam potential depression associated with the space charge which is a significant advantage in comparison with conventional solid beam microwave tubes at the same beam current. A key advantage of the annular beam is that the reduced plasma wave number can be tuned to achieve phase stability for an arbitrary correlation on interaction strength with beam velocity. It should be noted that this technique for improving phase stability of an EM in not possible with a solid beam klystron. The annular beam FEM provides the opportunity to extend the output power of sources in the 17 GHz regime by well over an order of magnitude with enhanced phase stability. The design and experimental status are discussed.

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6 p.

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INIS; OSTI as DE96014625

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  • 18. international linac conference, Geneva (Switzerland), 26-30 Aug 1996

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  • Other: DE96014625
  • Report No.: LA-UR--96-2799
  • Report No.: CONF-9608123--5
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 382423
  • Archival Resource Key: ark:/67531/metadc675721

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  • September 1, 1996

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  • July 25, 2015, 2:20 a.m.

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  • Feb. 25, 2016, 3:57 p.m.

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Fazio, M.V.; Carlsten, B.E.; Earley, L.M.; Fortgang, C.M.; Haddock, P.C. & Haynes, W.B. The development of an annular-beam, high power free-electron maser for future linear colliders, article, September 1, 1996; New Mexico. (digital.library.unt.edu/ark:/67531/metadc675721/: accessed June 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.