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Title: Lattice Design for PEP-X Ultimate Storage Ring Light Source

Abstract

SLAC expertise in designing and operating high current storage rings and the availability of the 2.2-km PEP-II tunnel present an opportunity for building a next generation light source - PEP-X - that would replace the SPEAR3 storage ring in the future. The PEP-X 'baseline' design, with 164 pm-rad emittance at 4.5 GeV beam energy and a current of 1.5 A, was completed in 2010. As a next step, a so-called 'ultimate' PEP-X lattice, reducing the emittance to 11 pm-rad at zero current, has been designed. This emittance approaches the diffraction limited photon emittance for multi-keV photons, providing near maximum photon brightness and high coherence. It is achieved by using 7-bend achromat cells in the ring arcs and a 90-m damping wiggler in one of the 6 long straight sections. Details of the lattice design, dynamic aperture, and calculations of the intra-beam scattering effect and Touschek lifetime at a nominal 0.2 A current are presented. Accelerator-based light sources are in high demand for many experimental applications. The availability of the 2.2-km PEP-II tunnel at SLAC presents an opportunity for building a next generation light source - PEP-X - that would replace the existing SPEAR3 light source in the future. The PEP-Xmore » study started in 2008, and the 'baseline' design, yielding 164 pm-rad emittance at 4.5 GeV beam energy and a current of 1.5 A, was completed in 2010. This relatively conservative design can be built using existing technology. However, for a long term future, it is natural to investigate a more aggressive, so-called 'ultimate' ring design. The goal is to reduce the electron emittance in both x and y planes to near the diffraction limited photon emittance of 8 pm-rad at hard X-ray photon wavelength of 0.1 nm. This would provide a near maximum photon brightness and significant increase in photon coherence. This study was motivated by the advances in low emittance design at MAX-IV. The latter was used as a starting point for the PEP-X arc lattice, however new features were included into the design for better tuning capabilities and compensation of non-linear optics effects. Further emittance reduction is achieved with a 90-m damping wiggler. Finally, intra-beam scattering (IBS) and Touschek lifetime effects were estimated and cross-checked using various codes.« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1032768
Report Number(s):
SLAC-PUB-14562
TRN: US1200560
DOE Contract Number:  
AC02-76SF00515
Resource Type:
Conference
Journal Name:
Conf.Proc.C110904:3070-3072,2011
Additional Journal Information:
Conference: Presented at the 2nd International Particle Accelerator Conference (IPAC-2011), San Sebastian, Spain, 4-9 Sep 2011
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ACCELERATORS; AVAILABILITY; BRIGHTNESS; DAMPING; DESIGN; DIFFRACTION; ELECTRONS; LIFETIME; LIGHT SOURCES; NONLINEAR OPTICS; PEP STORAGE RINGS; PHOTONS; SCATTERING; STANFORD LINEAR ACCELERATOR CENTER; STORAGE RINGS; TUNING; WAVELENGTHS; Accelerators,ACCPHY

Citation Formats

Bane, K L.F., Cai, Y, Nosochkov, Y, Wang, M -H, /SLAC, Hettel, R O, and /SLAC. Lattice Design for PEP-X Ultimate Storage Ring Light Source. United States: N. p., 2011. Web.
Bane, K L.F., Cai, Y, Nosochkov, Y, Wang, M -H, /SLAC, Hettel, R O, & /SLAC. Lattice Design for PEP-X Ultimate Storage Ring Light Source. United States.
Bane, K L.F., Cai, Y, Nosochkov, Y, Wang, M -H, /SLAC, Hettel, R O, and /SLAC. Tue . "Lattice Design for PEP-X Ultimate Storage Ring Light Source". United States. https://www.osti.gov/servlets/purl/1032768.
@article{osti_1032768,
title = {Lattice Design for PEP-X Ultimate Storage Ring Light Source},
author = {Bane, K L.F. and Cai, Y and Nosochkov, Y and Wang, M -H and /SLAC and Hettel, R O and /SLAC},
abstractNote = {SLAC expertise in designing and operating high current storage rings and the availability of the 2.2-km PEP-II tunnel present an opportunity for building a next generation light source - PEP-X - that would replace the SPEAR3 storage ring in the future. The PEP-X 'baseline' design, with 164 pm-rad emittance at 4.5 GeV beam energy and a current of 1.5 A, was completed in 2010. As a next step, a so-called 'ultimate' PEP-X lattice, reducing the emittance to 11 pm-rad at zero current, has been designed. This emittance approaches the diffraction limited photon emittance for multi-keV photons, providing near maximum photon brightness and high coherence. It is achieved by using 7-bend achromat cells in the ring arcs and a 90-m damping wiggler in one of the 6 long straight sections. Details of the lattice design, dynamic aperture, and calculations of the intra-beam scattering effect and Touschek lifetime at a nominal 0.2 A current are presented. Accelerator-based light sources are in high demand for many experimental applications. The availability of the 2.2-km PEP-II tunnel at SLAC presents an opportunity for building a next generation light source - PEP-X - that would replace the existing SPEAR3 light source in the future. The PEP-X study started in 2008, and the 'baseline' design, yielding 164 pm-rad emittance at 4.5 GeV beam energy and a current of 1.5 A, was completed in 2010. This relatively conservative design can be built using existing technology. However, for a long term future, it is natural to investigate a more aggressive, so-called 'ultimate' ring design. The goal is to reduce the electron emittance in both x and y planes to near the diffraction limited photon emittance of 8 pm-rad at hard X-ray photon wavelength of 0.1 nm. This would provide a near maximum photon brightness and significant increase in photon coherence. This study was motivated by the advances in low emittance design at MAX-IV. The latter was used as a starting point for the PEP-X arc lattice, however new features were included into the design for better tuning capabilities and compensation of non-linear optics effects. Further emittance reduction is achieved with a 90-m damping wiggler. Finally, intra-beam scattering (IBS) and Touschek lifetime effects were estimated and cross-checked using various codes.},
doi = {},
url = {https://www.osti.gov/biblio/1032768}, journal = {Conf.Proc.C110904:3070-3072,2011},
number = ,
volume = ,
place = {United States},
year = {2011},
month = {12}
}

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