Wakefield and Beam Centering Measurements of a Damped and Detuned X-Band Accelerator Structure

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In the Next Linear Collider (NLC) design, X-Band (11.4 GHz) accelerator structures are used to accelerate multibunch beams to several hundred GeV. Although these structures allow for high gradient operation, their strong deflecting modes impose a number of operational constraints. In particular, the long-range transverse wakefields generated by the bunches need to be reduced by about two orders of magnitude to prevent significant beam breakup. During the past five years, a reduction scheme that employs both detuning and damping of the structure dipole modes has been developed to meet this requirement. Several prototype Damped and Detuned Structures (DDS) have been ... continued below

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Adolphsen, Chris September 14, 1999.

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In the Next Linear Collider (NLC) design, X-Band (11.4 GHz) accelerator structures are used to accelerate multibunch beams to several hundred GeV. Although these structures allow for high gradient operation, their strong deflecting modes impose a number of operational constraints. In particular, the long-range transverse wakefields generated by the bunches need to be reduced by about two orders of magnitude to prevent significant beam breakup. During the past five years, a reduction scheme that employs both detuning and damping of the structure dipole modes has been developed to meet this requirement. Several prototype Damped and Detuned Structures (DDS) have been built to test and refine this scheme. The wakefield of the latest version, DDS3, has recently been measured in the Accelerator Structure Setup (ASSET) facility at SLAC. In this paper, we present these results together with predictions based on an equivalent circuit model of the structure. We also present ASSET studies in which the beam-induced dipole signals that are coupled out for damping purposes are used to center the beam in the structure.

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  • Other Information: PBD: 14 Sep 1999

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  • Report No.: SLAC-PUB-8174
  • Grant Number: AC03-76SF00515
  • DOI: 10.2172/12471 | External Link
  • Office of Scientific & Technical Information Report Number: 12471
  • Archival Resource Key: ark:/67531/metadc624169

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  • September 14, 1999

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  • June 16, 2015, 7:43 a.m.

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  • Feb. 2, 2016, 6:12 p.m.

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Adolphsen, Chris. Wakefield and Beam Centering Measurements of a Damped and Detuned X-Band Accelerator Structure, report, September 14, 1999; Menlo Park, California. (digital.library.unt.edu/ark:/67531/metadc624169/: accessed August 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.