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

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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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10 pages

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Zhou, F.; Nosochkov, Y.; Sheppard, J.C.; /SLAC; Liu, W. & /Argonne September 28, 2007.

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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 3x10{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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10 pages

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  • Report No.: SLAC-PUB-12798
  • Grant Number: AC02-76SF00515
  • DOI: 10.2172/917271 | External Link
  • Office of Scientific & Technical Information Report Number: 917271
  • Archival Resource Key: ark:/67531/metadc887978

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • September 28, 2007

Added to The UNT Digital Library

  • Sept. 22, 2016, 2:13 a.m.

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  • Dec. 2, 2016, 10:16 p.m.

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Zhou, F.; Nosochkov, Y.; Sheppard, J.C.; /SLAC; Liu, W. & /Argonne. Collimation Optimizations, Capture Efficiency, and Primary-beam Power Loss in the ILC Positron Source Transport, report, September 28, 2007; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc887978/: accessed October 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.