Impedance and instabilities in the NLC damping rings

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Description

We report on impedance calculations and single-bunch and multi-bunch instabilities in the NLC damping rings. Preliminary designs of vacuum chambers and major components have addressed beam impedance issues, with the desire to increase instability current thresholds and reducing growth rates. MAFIA calculations of short-range and long-range wakefields have allowed computations of growth rates and thresholds, which are presented here. Resistive wall instability dominates long-range effects, and requires a broadband feedback system to control coupled-bunch motion. Growth rates are within the range addressable by current feedback system technologies. Single-bunch instability thresholds are safely above nominal operating current.

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3 pages

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Corlett,J.; Li, D.; Pivi, M.; Rimmer, R.; DeSantis, S.; Wolski, A. et al. June 12, 2001.

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Description

We report on impedance calculations and single-bunch and multi-bunch instabilities in the NLC damping rings. Preliminary designs of vacuum chambers and major components have addressed beam impedance issues, with the desire to increase instability current thresholds and reducing growth rates. MAFIA calculations of short-range and long-range wakefields have allowed computations of growth rates and thresholds, which are presented here. Resistive wall instability dominates long-range effects, and requires a broadband feedback system to control coupled-bunch motion. Growth rates are within the range addressable by current feedback system technologies. Single-bunch instability thresholds are safely above nominal operating current.

Physical Description

3 pages

Notes

INIS; OSTI as DE00783879

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  • Particle Accelerator Conference 2001, Chicago, IL (US), 06/18/2001--06/22/2001

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  • Report No.: LBNL--48200
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 783879
  • Archival Resource Key: ark:/67531/metadc720656

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Office of Scientific & Technical Information Technical Reports

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  • June 12, 2001

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  • Sept. 29, 2015, 5:31 a.m.

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  • Sept. 1, 2016, 7:12 p.m.

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Corlett,J.; Li, D.; Pivi, M.; Rimmer, R.; DeSantis, S.; Wolski, A. et al. Impedance and instabilities in the NLC damping rings, article, June 12, 2001; California. (digital.library.unt.edu/ark:/67531/metadc720656/: accessed December 14, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.