Enhanced Method for Cavity Impedance Calculations

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With the proposal of medium to high average current accelerator facilities the demand for cavities with extremely low Higher Order Mode (HOM) impedances is increasing. Modern numerical tools are still under development to more thoroughly predict impedances that need to take into account complex absorbing boundaries and lossy materials. With the usually large problem size it is preferable to utilize massive parallel computing when applicable and available. Apart from such computational issues, we have developed methods using available computer resources to enhance the information that can be extracted from a cavities? wakefield computed in time domain. In particular this is ... continued below

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Marhauser, Frank; Rimmer, Robert; Tian, Kai & Wang, Haipeng May 1, 2009.

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With the proposal of medium to high average current accelerator facilities the demand for cavities with extremely low Higher Order Mode (HOM) impedances is increasing. Modern numerical tools are still under development to more thoroughly predict impedances that need to take into account complex absorbing boundaries and lossy materials. With the usually large problem size it is preferable to utilize massive parallel computing when applicable and available. Apart from such computational issues, we have developed methods using available computer resources to enhance the information that can be extracted from a cavities? wakefield computed in time domain. In particular this is helpful for a careful assessment of the extracted RF power and the mitigation of potential beam break-up or emittance diluting effects, a figure of merit for the cavity performance. The method is described as well as an example of its implementation.

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  • PAC09, 4-8 May 2009, Vancouver, BC, Canada

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  • Report No.: JLAB-ACC-09-982
  • Report No.: DOE/OR/23177-0729
  • Grant Number: AC05-06OR23177
  • Office of Scientific & Technical Information Report Number: 1021852
  • Archival Resource Key: ark:/67531/metadc840988

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  • May 1, 2009

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  • May 19, 2016, 3:16 p.m.

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  • June 2, 2016, 4:43 p.m.

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Marhauser, Frank; Rimmer, Robert; Tian, Kai & Wang, Haipeng. Enhanced Method for Cavity Impedance Calculations, article, May 1, 2009; Newport News, Virginia. (digital.library.unt.edu/ark:/67531/metadc840988/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.