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FNAL and CERN are carrying out a joint R&D program with the goal of building a 5.5-m-long twin-aperture 11-T \Nb3\Sn dipole prototype that is suitable for installation in the LHC. An important part of the program is the development and test of a series of short single-aperture and twin-aperture dipole models with a nominal field of 11 T at the LHC operation current of 11.85 kA and 20% margin. This paper presents the results of magnetic measurements of a 1-m-long single-aperture \Nb3\Sn dipole model fabricated and tested recently at FNAL, including geometrical field harmonics and effects of coil magnetization and iron yoke saturation. [ABSTRACT FROM PUBLISHER]

FNAL and CERN are performing an R&D program with the goal of developing a 5.5 m long twin-aperture 11 T \Nb3\Sn dipole suitable for installation in the Large Hadron Collider (LHC). An important part of the program is the development and test of a series of short single-aperture and twin-aperture models with a nominal field of 11 T at the LHC nominal current of 11.85 kA and 20% margin. This paper describes design and fabrication features, and test results of a 1 m long single-aperture \Nb3\Sn dipole model tested at FNAL. [ABSTRACT FROM PUBLISHER]

The planned upgrade of the LHC collimation system includes additional collimators to be installed in the dispersion suppressor areas of points 2, 3 and 7. To provide the necessary longitudinal space for the collimators, a replacement of 8.33 T Nb-Ti LHC main dipoles with 11 T dipoles based on Nb3Sn superconductor compatible with the LHC lattice and main systems is being considered. To demonstrate this possibility FNAL and CERN have started a joint program to develop a 2 m long single-aperture dipole magnet with the nominal field of 11 T at \sim11.85 kA current and 60 mm bore. This paper describes the demonstrator magnet magnetic and mechanical designs and analysis, coil fabrication procedure. The Nb3Sn strand and cable parameters and test results are also reported. [ABSTRACT FROM PUBLISHER]

The LHC collimation upgrade foresees two additional collimators installed in the dispersion suppressor regions of points 2, 3 and 7. To obtain the necessary longitudinal space for the collimators, a solution based on an 11 T dipole as replacement of the 8.33 T LHC main dipoles is being considered. CERN and FNAL have started a joint development program to demonstrate the feasibility of Nb3Sn technology for this purpose. The program started with the development and test of a 2-m-long single-aperture demonstrator magnet. The goal of the second phase is the design and construction of a series of 2-m-long twin-aperture demonstrator magnets with a nominal field of 11 T at 11.85 kA current. This paper describes the electromagnetic design and gives a forecast of the field quality including saturation of the iron yoke and persistent-current effects in the Nb3Sn coils. The mechanical design concepts based on separate collared coils, assembled in a vertically split iron yoke are also discussed. [ABSTRACT FROM PUBLISHER]

A series of 90-mm TQC quadrupole models with a collar-based mechanical structure has been fabricated and tested within the framework of the US-LHC Accelerator Research Program (LARP) using quadrupole-symmetric stainless steel collar laminations. This paper describes the design features, construction and test of TQC02Eb, the first TQC made with dipole-type collar and collaring techniques. Magnet test includes quench performance and field quality measurements at 4.5 and 1.9 K. Results of model performance for TQC quadrupoles based on dipole-type and quadrupole-type collars are compared and discussed. [ABSTRACT FROM AUTHOR]

As a first step toward the development of a large-aperture Nb3Sn superconducting quadrupole for the Large Hadron Collider (LHC) luminosity upgrade, two-layer technological quadrupole models (TQS01 at LBNL and TQC01 at Fermilab) are being constructed within the framework of the US LHC Accelerator Research Program (LARP). Both models use the same coil design, but have different coil support structures. This paper describes the TQC01 design, fabrication technology and summarizes its main parameters. [ABSTRACT FROM AUTHOR]

Examines the quench and mechanical performance of high gradient superconducting quadrupole magnet for use in the interaction regions of Large Hadron Collider. Magnetic field harmonics; Mechanical behavior in several thermal cycles; Design of the magnet.

Describes a single-layer common coil dipole being developed for the Very Large Hadron Collider at the Fermi Accelerator Laboratory in Batavia, Illinois. Design concept which allows a large bending radius at the coil ends and is well suited for use of the react-and-wind technique with brittle superconductors.

Describes the development of react and wind common coil dipoles for the Very Large Hadron Collider at the Fermi Accelerator Laboratory in Batavia, Illinois. Selection of Nb[sub 3]Sn wound after reaction to reduce costs; Horizontally split yoke design for the hybrid common coil; Magnetic design optimization.

Investigates the quench performance of model magnets for the Large Hadron Collider inner triplet quadrupoles at the Fermilab in Batavia, Illinois. Refining of mechanical and magnetic design; Optimization of fabrication and assembly tooling; Quench tests for several thermal cycles; Excitation current ramp rate; Temperature dependence studies; Ramp rate sensitivity.

Reports on the achievement of field quality in Fermilab-built models of quadrupole magnets for the Large Hadron Collider (LHC) interaction region. Development of the models by the United States LHC Accelerator Project; Planned operation of the magnets in superfluid helium; Design of the magnets; Measurement system; Field quality analysis; Reference harmonics table.