Status of Long Coil Production for the MQXFB Nb3Sn Prototype Quadrupole for the HiLumi LHC

Abstract

The High luminosity LHC upgrade target is to increase the integrated luminosity by a factor 10, resulting in an integrated luminosity of 3000 fb-1. One major improvement foreseen is the reduction of the beam size at the collision points. This requires the development of 150 mm single aperture quadrupoles for the interaction regions. These quadrupoles are under development in a joint collaboration between CERN and the US-LHC Accelerator Research Program (LARP). The chosen approach for achieving a nominal quadrupole field gradient of 132.6 T/m is based on the Nb3Sn technology. The coils with a length of 7281 mm will be the longest Nb3Sn coils fabricated so far for accelerator magnets. The production of the long coils was launched in 2016 based on practise coils made from copper. This paper provides a status of the production of the first low grade and full performance coils and describes the production process and applied quality control. Furthermore an outlook for the prototype assembly is provided.

Optimizing the use of pressurized bladders for the assembly of HL-LHC MQXFB magnets

“…Among various components to be upgraded, the installation of new low − β quadrupole magnets is envisaged. The new magnets, called MQXF [6,[52][53][54][55][56][57][58], will replace the today's present Nb-Ti quadrupole magnets that were provided as in-kind contribution to the LHC by USA and Japan [59,60].…”