In order to reduce the beam size by a factor two in the inter-action points, and to increase the rate of collisionsby a factorof five, the HL-LHC Project  is planning to install in the LHC Interaction Regions(IR) new inner triplet (or low-β) quadru-pole magnets, called MQXF. With respect to the current triplet quadrupole magnets, MQXF will feature a largeraper-ture, from 70 to 150mm, a higher peak field, from 8.6 to 11.4T, and a new superconducting material, Nb3Sn instead of Nb-Ti.Out of the 30 triplets magnets (including spares) that will be installed in the HL-LHC, 20 magnets, called MQXFA and 4.2m long, will be fabricated by the US Accelerator Research Program (AUP), a continuation of the LARPProgram.

The remaining 10 magnets, called MQXFB and 7.15m long, will be fabricated by CERN. Both MQXFA and MQXFB, which have identical cross-sections and 3D design,will have to produce at a nominal gradient of 132.6 T. The fabrication of the so-called “series magnets”, i.e. the ones to be installed in the machine, will start in 2019, and it was preceded by the devel-opment of short model magnets, 1.5 m long, and full-length pro-totypes,constructed and tested to characterized magnet perfor-mance. At the time of the submission of this paper, 4short mod-els (MQXFS1-3-5-4)and 2 MQXFA prototypes(MQXFAP1-2) have been tested,while the first MQXFB prototype(MQXFBP1) is being assembled. In addition, two single-coiltests, called MQXFSM1 and MQXFAM1 for the short and longcoils, have been carried out. We provide here a description ofthe conductor and coils used in the different magnets, the pre-loading conditions, and a summary of the quench performance.