Estimation of collective instabilities in RHIC

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The authors have estimated the broadband impedance in RHIC to be {vert_bar}Z/n{vert_bar} < 1.2 {Omega} for frequencies above 100 MHz. The Z/n threshold is set for Au{sup +79} ions at transition with an estimated 10% growth in emittance for Z/n = 1.5 {Omega}. They summarize the sources of broad and narrow band impedances in RHIC and investigate the multibunch instability limits throughout the machine cycle. The largest contribution to the broadband impedance comes from the abort and injection kickers. Since RHIC is designed to accelerate fully stripped ions from H{sup +} up to Au{sup +79} they give results for both ... continued below

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3 p.

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MacKay, W.W.; Blaskiewicz, M.; Deng, D.; Mane, V.; Peggs, S.; Ratti, A. et al. May 1, 1995.

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The authors have estimated the broadband impedance in RHIC to be {vert_bar}Z/n{vert_bar} < 1.2 {Omega} for frequencies above 100 MHz. The Z/n threshold is set for Au{sup +79} ions at transition with an estimated 10% growth in emittance for Z/n = 1.5 {Omega}. They summarize the sources of broad and narrow band impedances in RHIC and investigate the multibunch instability limits throughout the machine cycle. The largest contribution to the broadband impedance comes from the abort and injection kickers. Since RHIC is designed to accelerate fully stripped ions from H{sup +} up to Au{sup +79} they give results for both protons and gold ions; other ions should give results somewhere between these two extremes. All ion species are expected to be stable during storage. At lower energies damping systems and chromaticity corrections will limit any growth to acceptable levels during the short time it takes to inject and accelerate the beams.

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3 p.

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INIS; OSTI as DE95011347

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  • 16. Institute of Electrical and Electronic Engineers (IEEE) particle accelerator conference, Dallas, TX (United States), 1-5 May 1995

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  • Other: DE95011347
  • Report No.: BNL--61173
  • Report No.: CONF-950512--52
  • Grant Number: AC02-76CH00016
  • Office of Scientific & Technical Information Report Number: 61185
  • Archival Resource Key: ark:/67531/metadc698157

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  • May 1, 1995

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  • Aug. 14, 2015, 8:43 a.m.

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  • Nov. 20, 2015, 1:43 p.m.

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MacKay, W.W.; Blaskiewicz, M.; Deng, D.; Mane, V.; Peggs, S.; Ratti, A. et al. Estimation of collective instabilities in RHIC, article, May 1, 1995; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc698157/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.