Abstract
During the summer and fall of 2018 the Cornell High Energy Synchrotron Source (CHESS) is undergoing an upgrade to increase high-energy flux for x-ray users. The upgrade requires replacing one-sixth of the Cornell Electron Storage Ring (CESR), inverting the polarity of half of the CHESS beam lines, and switching to single-beam on-axis operation. The new sextant is comprised of six double-bend achromats (DBAs) with combined-function dipole-quadrupoles. Although the DBA design is widely utilized and well understood, the constraints for the CESR modifications make the CHESS-U lattice unique. This paper describes the design objectives, constraints, and implementation for the CESR accelerator upgrade for CHESS-U.
Highlights
The Cornell Electron/positron Storage Ring (CESR) was designed as an electron-positron collider, with two diametrically opposed interaction regions
The Cornell High Energy Synchrotron Source (CHESS), founded contemporaneously with CESR, was initially comprised of three x-ray extraction lines off the hard-bend dipoles from the counter-clockwise electron beam, expanding in 1988-89 with the addition of four beam lines off the clockwise positron beam in CHESS East, and again in 1999 with the construction of G-line, adding three end stations fed by an insertion device from the positron beam
With the conclusion of HEP operations, CESR is being reconfigured as a dedicated high-energy, high-performance single-beam synchrotron light source, CHESS-U
Summary
The Cornell Electron/positron Storage Ring (CESR) was designed as an electron-positron collider, with two diametrically opposed interaction regions. The Cornell High Energy Synchrotron Source (CHESS), founded contemporaneously with CESR, was initially comprised of three x-ray extraction lines off the hard-bend dipoles from the counter-clockwise electron beam, expanding in 1988-89 with the addition of four beam lines (including one permanent-magnet wiggler) off the clockwise positron beam in CHESS East, and again in 1999 with the construction of G-line, adding three end stations fed by an insertion device from the positron beam. The CesrTA layout enabled the operation of CHESS in the arc-pretzel configuration with counter-rotating beams of electrons and positrons [2]. With the conclusion of HEP operations, CESR is being reconfigured as a dedicated high-energy, high-performance single-beam synchrotron light source, CHESS-U.
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