Abstract-The first step in the magnet R&D of the U.S. LHC Accelerator Research Program (LARP) is fabrication of tech nology quadrupoles TQSOl and TQCOl. These are twolayer magnets which use cables of same geometry made of 0.7 mm MJR Nb 3 Sn. Through strand billet qualification and tests of strands extracted from the cables, predictions of magnet performance are made. Measurements included the critical current, I c , using the voltagecurrent (VI) method at constant field, the stability current, Is, as the minimal quench current obtained with the voltagefield (VH) method at constant current in the sample, and RRR. Magnetization was measured at low and high fields to determine the effective filament size and to detect flux jumps. Effects of heat treatment duration and temperature on I c and Is were also studied. The Nb 3 Sn strand and cable samples, the equipment, measurement procedures, and results are described. Based on these results, strand specifications were formulated for next LARP quadrupole models.
In support of the development of a large-aperture Nb 3 Sn superconducting quadrupole for the Large Hadron Collider luminosity upgrade, two models (TQS and TQC) with a 90-mm aperture are being constructed at LBNL and FNAL within the framework of the US LHC Accelerator Research Program (LARP). These models use two identical Nb 3 Sn coils but have different coil support structures. This paper describes the fabrication, assembly, cool-down and test of TQS01-a model based on key and bladder technology with supporting iron yoke and an aluminum shell. Comparison of the test measurements with design expectations is also reported.
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