Studies of beam induced dipole-mode signals in accelerating structures at the SLC

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Beam emittance dilution by self induced transverse fields (wakefields) in accelerating structures is a key problem in linear accelerators. To minimize the wakefield effects the beam trajectory must be precisely centered within the structures. An efficient way to achieve this is to detect beam induced microwave signals in the lowest dipole mode band and to steer the beam by minimizing these signals. This paper briefly covers some experiences from SLC S-band structures, but mainly concentrates on results of a wakefield instrumentation scheme applied to a NLC prototype X-band structure and tested with beam in the SLC linac. A beam based ... continued below

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6 p.

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Seidel, M. June 1, 1997.

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Description

Beam emittance dilution by self induced transverse fields (wakefields) in accelerating structures is a key problem in linear accelerators. To minimize the wakefield effects the beam trajectory must be precisely centered within the structures. An efficient way to achieve this is to detect beam induced microwave signals in the lowest dipole mode band and to steer the beam by minimizing these signals. This paper briefly covers some experiences from SLC S-band structures, but mainly concentrates on results of a wakefield instrumentation scheme applied to a NLC prototype X-band structure and tested with beam in the SLC linac. A beam based in-situ structure straightness measurement is shown as well as results of beam steering experiments based on phase and amplitude detection of two separated modes in the structure. After centering the beam the reduction of the wakefield was demonstrated independently by probing it with a test bunch that is deflected by the residual wakefield at a short distance behind the drive bunch.

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6 p.

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INIS; OSTI as DE99002441

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  • 17. IEEE particle accelerator conference, Vancouver (Canada), 12-16 May 1997

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  • Other: DE99002441
  • Report No.: SLAC-PUB--7557
  • Report No.: CONF-970503--
  • Grant Number: AC03-76SF00515
  • Office of Scientific & Technical Information Report Number: 335185
  • Archival Resource Key: ark:/67531/metadc676128

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  • June 1, 1997

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  • July 25, 2015, 2:20 a.m.

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  • Aug. 9, 2016, 12:24 p.m.

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Seidel, M. Studies of beam induced dipole-mode signals in accelerating structures at the SLC, article, June 1, 1997; California. (digital.library.unt.edu/ark:/67531/metadc676128/: accessed September 26, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.