Accelerating field step-up transformer in wake-field accelerators

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In the wake-field scheme of particle acceleration, a short, intense drive bunch of electrons passes through a slow-wave structure, leaving behind high rf power in its wake field. The axial accelerating electric field associated with the rf can be quite large, > 100 MeV/m, and is used to accelerate a much less intense witness'' beam to eventual energies > 1 TeV. The rf power is deposited predominantly in the fundamental mode of the structure, which, for dielectric-lined waveguide as used at Argonne, is the TM{sub 01} mode. In all likelihood on the field amplitude will be limited only by rf ... continued below

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Chojnacki, E.; Gai, W.; Schoessow, P. & Simpson, J. January 1, 1991.

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In the wake-field scheme of particle acceleration, a short, intense drive bunch of electrons passes through a slow-wave structure, leaving behind high rf power in its wake field. The axial accelerating electric field associated with the rf can be quite large, > 100 MeV/m, and is used to accelerate a much less intense witness'' beam to eventual energies > 1 TeV. The rf power is deposited predominantly in the fundamental mode of the structure, which, for dielectric-lined waveguide as used at Argonne, is the TM{sub 01} mode. In all likelihood on the field amplitude will be limited only by rf breakdown of the dielectric material, the limit of which is currently unknown in the short time duration, high frequency regime of wake-field acceleration operation. To obtain such strong electric fields with given wake-field rf power, the dimensions of the dielectric-lined waveguide have to be fairly small, OD of the order of a cm and ID of a few mm, and this gives rise to the generation of strong deflection modes with beam misalignment. While a scheme exists to damp such deflection modes on a bunch-to-bunch time scale, head-tail beam deflection could still be a problem and BNS damping as well as FODO focusing are incomplete cures. Presented here are details of a scheme by which the rf power is generated by in a large-diameter wake-field tube, where deflection mode generation by the intense drive beam is tolerable, and then fed into a small-diameter acceleration tube where the less intense witness beam is accelerated by the greatly enhanced axial electric field. The witness beam generates little deflection-mode power itself, even in the small acceleration tube, thus a final high-quality, high-energy electron beam is produced.

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Pages: (4 p)

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OSTI; NTIS; INIS; GPO Dep.

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  • 1991 Institute of Electrical and Electronics Engineers (IEEE) particle accelerator conference (PAC), San Francisco, CA (United States), 6-9 May 1991

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  • Other: DE91015538
  • Report No.: ANL-HEP-CP-91-41
  • Report No.: CONF-910505--385
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 5678493
  • Archival Resource Key: ark:/67531/metadc1092541

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  • January 1, 1991

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  • Feb. 10, 2018, 10:06 p.m.

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  • April 17, 2018, 3:26 p.m.

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Chojnacki, E.; Gai, W.; Schoessow, P. & Simpson, J. Accelerating field step-up transformer in wake-field accelerators, article, January 1, 1991; Illinois. (digital.library.unt.edu/ark:/67531/metadc1092541/: accessed September 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.