Novel Design for High Field, Large Aperture Quadrupoles for Electron-Ion Collider

The proposed Electron-Ion Collider (EIC) needs several high-field, large-aperture quadrupole magnets in the interaction region for the ion or proton beams- These magnetsshould (a) be able to tolerate high radiation loads, (b) be compact in size, with limited space for iron shielding, and (c) have a field-free region along the length of the magnet for the passage of electron beams- We propose to develop designs for EIC quadrupoles in Phase I based on racetrack coils satisfying the above requirements- In particular, we will examine a novel“modular design” concept- The modular design is based on simple racetrack coils, which require less expensive tooling to build the magnets- However, unlike in many racetrack coil quadrupole designs, the modular design is similar to the Panofsky quadrupole design, which allows conductor at the mid-plane to be placed at a radius similar to that in conventional cosine two- theta quadrupoles- This difference in configuration is crucial to creating high field gradient- Moreover, the “modular design” also enables a “modular R&D program” in which the same coils can be used in “proof-of-principle” magnets of different aperture- Such a “modular program” should significantly reduce the cost of R&D, which is a significant part of the overall cost of developing the small number of Nb3Sn magnets with different apertures- We propose to build a Proof-of-Principle demonstration magnet in Phase II-