Development Status of a 2-m Model Magnet of Beam Separation Dipole for the HL-LHC Upgrade

The high-luminosity Large Hadron Collider (HL-LHC) upgrade project aims to increase the LHC peak luminosity up to 5×10
³⁴
cm
^-2
s
^-1
and the integrated luminosity up to3000 fb
^-1
. To achieve this goal, the quadrupole and dipole magnets around the two interaction points, i.e., the ATLAS and the CMS, will be upgraded. The High Energy Accelerator Research Organization (KEK) is in charge of the development of beam separation dipole (D1). In new D1, the coil aperture is enlarged to be 150 mm, and an integrated field of 35 T · m is required at 1.9 K and 12.0 kA. This paper reports the current status of the development of a 2-m model magnet.