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Fermilab is collaborating with Lawrence Berkeley National Laboratory (LBNL) and Brookhaven National Laboratory (BNL) (US-LARP collaboration) to develop a large-aperture Nb3Sn superconducting quadrupole for the Large Hadron Collider (LHC) luminosity upgrade. An important component of this work is the development of materials that are sufficiently radiation resistant for use in critical areas of the upgrade. This paper describes recent progress in characterization of materials, including the baseline CTD101K epoxy, cyanate ester blends, and Matrimid 5292, a bismaleimide-based system. Structural properties of "ten stacks" of cable impregnated with these materials are tested at room and cryogenic temperatures and compared to the baseline CT-101K. Experience with potting 1 and 2 meter long coils with Matrimid 5292 are described. Test results of a single 1-m coil impregnated with Matrimid 5292 are reported and compared to similar coils impregnated with the traditional epoxy. [ABSTRACT FROM AUTHOR]

The Muon-to-Electron conversion experiment (Mu2e), under development at Fermilab, seeks to detect direct muon to electron conversion to provide evidence for a process violating muon and electron lepton number conservation that cannot be explained by the Standard Model of particle physics. The required magnetic field is produced by a series of superconducting solenoids. This paper describes the conceptual design of the 5 T, 4 m long solenoid cold mass with 1.67 m bore with the emphasis on the magnetic, radiation and thermal analyses. [ABSTRACT FROM AUTHOR]

Fermilab is developing Nb3Sn quadrupole magnets for the planned upgrade of interaction regions of the Large Hadron Collider (LHC). Two distinctly different approaches have been employed, one using quadrupole-symmetric and one using dipole-symmetric collar laminations. This paper describes the design features of both collar types, collaring techniques for brittle Nb3Sn coils, and compares the advantages and disadvantages of the two approaches. Results of mechanical analysis for quadrupoles based on dipole-type and quadrupole-type collars are presented. Magnet construction issues and test results are reported. Test results include coil and component strain measurements during construction. Plans for the completion and test of the first dipole-symmetric assembly are described. [ABSTRACT FROM AUTHOR]

A series of 1-m long Nb3Sn dipole magnets have been built at Fermilab in an attempt to refine the wind-and-react technology for Nb3Sn conductor. Models have been made with MJR and PIT strand with varying degrees of success. Subsequently two new dipole “mirror” magnets based on RRP Nb3Sn coils were constructed and tested. This paper describes the design, fabrication and test results of those magnets. © 2006 American Institute of Physics [ABSTRACT FROM AUTHOR]

Fermilab is involved in the development of Nb3Sn magnets for future hadron colliders. One of the magnet design options is based on cosine-theta coils and the wind-and-react approach. Three short dipole models of this type were fabricated and tested revealing serious problems in magnet quench performance. To effectively address these issues, coil tests were continued in a mirror magnet configuration, where one coil was replaced with a half-cylinder of low carbon steel (the magnetic mirror) inside the magnet mechanical structure. This approach has reduced the fabrication cost and time as well as improved the coil instrumentation. The paper summarizes the magnetic and mechanical design of mirror magnet configuration along with fabrication details. © 2004 American Institute of Physics [ABSTRACT FROM AUTHOR]

Fermilab is developing 10-12 T superconducting dipole magnets for future accelerators based on Nb[sub 3]Sn conductor. Within the High Field Magnet Project, a common coil design was chosen for magnet R&D using the react & wind approach. Based on cable studies in which a variety of designs were tried and tested using inexpensive ITER strands, a 41-strand cable was used for a racetrack coil, whereas a 60-strand cable was preferred for the common coil model. Multifilamentary Nb[sub 3]Sn strands 0.7 mm in diameter to be respectively used in the racetrack coil and the common coil model were purchased from OST (Modified Jelly Roll technology) and IGC (Internal Tin technology). They are herein characterized by I[sub c], n-value, residual resistivity ratio, and magnetization. Results of cabling and bending degradation are also presented. [ABSTRACT FROM AUTHOR]