Next-Generation Linear Collider Final Focus System Stability Tolerances

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The design of final focus systems for the next generation of linear colliders has evolved largely from the experience gained with the design and operation of the Stanford Linear Collider (SLC) and with the design of the Final Focus Test Beam (FFTB). We will compare the tolerances for two typical designs for a next-generation linear collider final focus system. The chromaticity generated by strong focusing systems, like the final quadrupole doublet before the interaction point of a linear collider, can be canceled by the introduction of sextupoles in a dispersive region. These sextupoles must be inserted in pairs separated by ... continued below

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8 pages

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Roy, G. & Irwin, J. April 25, 2007.

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The design of final focus systems for the next generation of linear colliders has evolved largely from the experience gained with the design and operation of the Stanford Linear Collider (SLC) and with the design of the Final Focus Test Beam (FFTB). We will compare the tolerances for two typical designs for a next-generation linear collider final focus system. The chromaticity generated by strong focusing systems, like the final quadrupole doublet before the interaction point of a linear collider, can be canceled by the introduction of sextupoles in a dispersive region. These sextupoles must be inserted in pairs separated by a -I transformation (Chromatic Correction Section) in order to cancel the strong geometric aberrations generated by sextupoles. Designs proposed for both the JLC or NLC final focus systems have two separate chromatic correction sections, one for each transverse plane separated by a ''{beta}-exchanger'' to manipulate the {beta}-function between the two CCS. The introduction of sextupoles and bending magnets gives rise to higher order aberrations (long sextupole and chrome-geometries) and radiation induced aberrations (chromaticity unbalance and ''Oide effect'') and one must optimize the lattice accordingly.

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8 pages

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  • Contributed to 1990 DPF Summer Study on High-energy Physics: Research Directions for the Decade (Snowmass 90), Snowmass, Colorado, 25 Jun - 13 Jul 1990

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  • Report No.: SLAC-PUB-12485
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 902726
  • Archival Resource Key: ark:/67531/metadc885744

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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.

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  • April 25, 2007

Added to The UNT Digital Library

  • Sept. 22, 2016, 2:13 a.m.

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  • Sept. 26, 2017, 3:42 p.m.

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Roy, G. & Irwin, J. Next-Generation Linear Collider Final Focus System Stability Tolerances, article, April 25, 2007; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc885744/: accessed June 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.