Resistive Wall Instability in the NLC Main Damping Rings

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We study transverse coupled-bunch instabilities driven by the resistive-wall impedance in the NLC Main Damping Rings. We compare the growth rates of the different modes predicted by a simple theory using a simplified lattice model with the results of a detailed simulation that includes variation of the beta functions and the actual fill structure of the machine. We find that the results of the analytical calculations are in reasonable agreement with the simulations. We include a simple model of a bunch-by-bunch feedback system in the simulation to show that the instabilities can be damped by a feedback system having parameters ... continued below

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Wolski, Andrzej July 1, 2004.

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We study transverse coupled-bunch instabilities driven by the resistive-wall impedance in the NLC Main Damping Rings. We compare the growth rates of the different modes predicted by a simple theory using a simplified lattice model with the results of a detailed simulation that includes variation of the beta functions and the actual fill structure of the machine. We find that the results of the analytical calculations are in reasonable agreement with the simulations. We include a simple model of a bunch-by-bunch feedback system in the simulation to show that the instabilities can be damped by a feedback system having parameters that are realistic, and possibly conservative. The noise level on the feedback system pick-up must be low, to avoid driving random bunch-to-bunch jitter above the specified limit of 10 percent of the vertical beam size.

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  • Report No.: LBNL--59526
  • Report No.: CBP Tech Note-322
  • Grant Number: DE-AC02-05CH11231
  • DOI: 10.2172/889311 | External Link
  • Office of Scientific & Technical Information Report Number: 889311
  • Archival Resource Key: ark:/67531/metadc873397

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  • July 1, 2004

Added to The UNT Digital Library

  • Sept. 21, 2016, 2:29 a.m.

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  • Sept. 30, 2016, 2:11 p.m.

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Wolski, Andrzej. Resistive Wall Instability in the NLC Main Damping Rings, report, July 1, 2004; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc873397/: accessed December 15, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.