Collimation Optimizations, Capture Efficiency, and Primary-Beam Power Loss in the ILC Positron Source

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The ILC positron beam generated from a thin Ti target has a wide energy spread and large transverse divergence. With the collection optics immediately downstream of the target and pre-acceleration to 125 MeV, the collected positron beam still has a long tail of positrons with low energies and large transverse divergence, which will be lost in the rest of the ILC positron source beamline. A collimation system is proposed and optimized for the case of a shielded target with quarter-wave transformation collection optics so that the power loss in the magnets and RF structures is effectively controlled within the acceptable ... continued below

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4 pages

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Zhou, F.; /slac; Liu, W.; /Argonne; Nosochkov, Y.; Sheppard, J.C. et al. July 2, 2008.

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The ILC positron beam generated from a thin Ti target has a wide energy spread and large transverse divergence. With the collection optics immediately downstream of the target and pre-acceleration to 125 MeV, the collected positron beam still has a long tail of positrons with low energies and large transverse divergence, which will be lost in the rest of the ILC positron source beamline. A collimation system is proposed and optimized for the case of a shielded target with quarter-wave transformation collection optics so that the power loss in the magnets and RF structures is effectively controlled within the acceptable level and in the damping ring (DR) within 640 W, assuming 3 x 10{sup 10} of the captured positrons per bunch in the DR. In this case, the capture efficiency and DR injection efficiency are 13% and 99.8%, respectively. The lower capture efficiency is expected to result in higher injection efficiency and therefore, a lower power loss in the DR. The capture efficiency for the cases of a shielded target with flux concentrator and 5-T immersed target with flux concentrator is 20% and 30%, respectively, with the collimation system.

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4 pages

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  • Presented at 11th European Particle Accelerator Conference (EPAC 08), Magazzini del Cotone, Genoa, Italy, 23-27 Jun 2008

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  • Report No.: SLAC-PUB-13274
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 934433
  • Archival Resource Key: ark:/67531/metadc898275

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  • July 2, 2008

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  • Sept. 27, 2016, 1:39 a.m.

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  • Dec. 2, 2016, 10:16 p.m.

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Zhou, F.; /slac; Liu, W.; /Argonne; Nosochkov, Y.; Sheppard, J.C. et al. Collimation Optimizations, Capture Efficiency, and Primary-Beam Power Loss in the ILC Positron Source, article, July 2, 2008; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc898275/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.