ILC Damping Rings: Benefit of the Antechamber or: Antechamber vs. SEY

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We present simulation results of the build-up of the electron-cloud density ne for the two proposed ILC damping ring lattices, DC04 and DSB3, with particular attention to the potential benefit of an antechamber. We examine a field-free region and a dipole bending magnet, with or without an antechamber. We assume a secondary electronemission model for the chamber surface based on approximate fits to measured data for TiN, except that we let the peak value of the secondary emission yield (SEY), delta max, be a variable. We conclude that there is a critical value of delta max below which the antechamber ... continued below

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Furman, M. A. March 30, 2011.

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We present simulation results of the build-up of the electron-cloud density ne for the two proposed ILC damping ring lattices, DC04 and DSB3, with particular attention to the potential benefit of an antechamber. We examine a field-free region and a dipole bending magnet, with or without an antechamber. We assume a secondary electronemission model for the chamber surface based on approximate fits to measured data for TiN, except that we let the peak value of the secondary emission yield (SEY), delta max, be a variable. We conclude that there is a critical value of delta max below which the antechamber provides a substantial benefit, roughly a factor ~;;40 reduction in ne relative to the case in which max exceeds the critical value. We estimate the steady-state value of ne as a function of delta max, and thereby obtain the critical value of delta max for all cases considered. Thus, from the perspective of the electron-cloud effect, the inclusion of an antechamber in the design is justified only if delta max is below the critical value. The results presented here constitute a slight extension of those previously presented in March and September, 2010 [1, 2].

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  • 49th ICFA Advanced Beam Dynamics Workshop on Electron Cloud Physics, ECLOUD10, Cornell University, Ithaca, NY, USA, October 8-12, 2010

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  • Report No.: LBNL-4474E
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 1013073
  • Archival Resource Key: ark:/67531/metadc845315

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  • March 30, 2011

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  • May 19, 2016, 3:16 p.m.

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  • June 16, 2016, 3:39 p.m.

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Furman, M. A. ILC Damping Rings: Benefit of the Antechamber or: Antechamber vs. SEY, article, March 30, 2011; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc845315/: accessed December 11, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.