AW ANALOG METHOD FOR MEASURING THE LONGITUDINAL COUPLING IMPEDANCE OF A RELATIVISTIC PARTICLE BEAM WITH ITS ENVIRONMNET

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The stability of a coasting beam against self-bunching (negative mass instability) may be expressed in terms of a beam coupling impedance. The impedance has contributions from self-fields, wall impedance, and curvature effects. This paper describes procedures for measuring the wall and curvature contributions to the coupling impedance by means of an analog in which the beam is replaced by a conductor propagating a TEM-like mode. Conditions are derived under which the measurements are valid, various measurement procedures are described and results of the application of the method to the compressor of an electron ring accelerator are reported.

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Faltens, A.; Hartvig, E.C.; Mohl, D. & Sessler, A.M. August 1, 1971.

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Description

The stability of a coasting beam against self-bunching (negative mass instability) may be expressed in terms of a beam coupling impedance. The impedance has contributions from self-fields, wall impedance, and curvature effects. This paper describes procedures for measuring the wall and curvature contributions to the coupling impedance by means of an analog in which the beam is replaced by a conductor propagating a TEM-like mode. Conditions are derived under which the measurements are valid, various measurement procedures are described and results of the application of the method to the compressor of an electron ring accelerator are reported.

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  • Report No.: LBL-43
  • Grant Number: DE-AC02-05CH11231
  • DOI: 10.2172/937061 | External Link
  • Office of Scientific & Technical Information Report Number: 937061
  • Archival Resource Key: ark:/67531/metadc895992

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Office of Scientific & Technical Information Technical Reports

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  • August 1, 1971

Added to The UNT Digital Library

  • Sept. 27, 2016, 1:39 a.m.

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  • Sept. 30, 2016, 6:19 p.m.

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Faltens, A.; Hartvig, E.C.; Mohl, D. & Sessler, A.M. AW ANALOG METHOD FOR MEASURING THE LONGITUDINAL COUPLING IMPEDANCE OF A RELATIVISTIC PARTICLE BEAM WITH ITS ENVIRONMNET, report, August 1, 1971; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc895992/: accessed December 11, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.