Conceptual Design of the Interaction Region Magnets for Future Electron-Ion Collider at Jefferson Lab

Abstract

The JLEIC is a proposed new machine for nuclear physics research. As designed, it will deliver from 15 and 65 GeV center of mass energy collisions between electrons and nuclei. It uses the existing CEBAF accelerator as a full energy injector to deliver electrons into a new electron collider ring. A new ion accelerator and collider complex will deliver up to 100 GeV protons, or 40 GeV/nucleon ions. The machine will have luminosity goals of above 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">33</sup> cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-2</sup> s <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-1</sup> in the whole energy range with a maximum of a few 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">34</sup> cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-2</sup> s <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-1</sup> . The machine has room for two interaction regions with only one initially installed. The crossing angle in the primary interaction region will be 50 mrad. The whole detector region including forward detection covers about 80 m of the JLEIC complex. This paper will describe the requirements and preliminary designs for both the ion and electron beam magnets in the complex 32-m-long interaction region around the interaction point. The interaction region has over 37 superconducting magnets operating at 4.5 K; these include dipoles, quadrupoles, skew-quadrupoles, solenoids, horizontal and vertical correctors, and higher order multipole magnets. The paper will also discuss the electromagnetic interaction between these magnets.