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As a part of the USLHC program, Fermilab is building half of the inner triplet quadrupole magnets for the LHC. Two identical quadrupoles (MQXB) with a dipole corrector between them in a single cryogenic unit (LQXB) comprise the Q2 optical element of the final focus triplets in the interaction regions. The 5.5 m long MQXB have a 70 mm aperture and operate in superfluid helium at 1.9 K with a peak field gradient of 215 T/m. Manufacturing of the 18 magnets is in an advanced stage. A program of magnetic field quality measurements of the magnets is performed at room temperature during magnet fabrication as well as at superfluid helium temperature during the cold qualification of each magnet. Results of the measurements are summarized in this paper. [ABSTRACT FROM AUTHOR]

Production has started for the high-gradient superconducting quadrupole magnets developed by the US LHC Accelerator Project for the Interaction Regions of the Large Hadron Collider. The first full-scale Q2 assembly has recently been measured during fabrication at Fermilab. This paper reports on the mechanical alignment processes used during production of the combined cold-mass assembly and during its installation in the cryostat, and the validation of these processes in meeting accelerator requirements. Also presented are the results of measurements of the field axis and roll angle of the completed magnet assembly. Results are compared to machine performance requirements. [ABSTRACT FROM AUTHOR]

Investigates the design and fabrication of superconducting low-beta quadrupole magnets for the interaction regions of the Large Hadron Collider. Magnetic field measurement; Determination of the field axis; Field quality; Alignment requirements.

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.

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.

Reports on the status of the Large Hadron Collider (LHC) inner triplet quadrupole program at Fermi National Accelerator Laboratory in Batavia, Illinois. Required operating gradient of the magnet; Design and acceptance criteria for the model magnet; Full length prototype which includes cold mass and cryostat design; Wounding and curing of the inner and outer coils of the prototype.

Determines the influence of mechanical vibrations on the field quality measurements of Large Hadron Collider interaction region quadrupole magnets. Measurement of the field quality using a rotating coil system; Transverse probe motion errors; Measurement of vibrations in rotating coil systems.

Determines the field alignment of quadrupole magnets for the Large Hadron Collider Accelerator Project developed by the Fermi National Accelerator Laboratory in Illinois. Details of the Single Stretched Wire System; Direct and alternating current measurements; Determination of true magnet axis; Measurements with different wire lengths.

Describes the irradiation test performed on a high temperature superconducting wire. Performance of the test at Fermilab; Unchanged critical current density values; Total radiation dose.

Describes design strategies for measuring the strength and shape of the magnetic field of Fermilab Main Injector dipoles. Data acquisition and signal processing; Experience with Main Injector production dipoles.

Superconducting low-beta quadrupole magnets for the interaction regions of the Large Hadron Coilider have been developed by the US-LHC Accelerator Project. These 70 mm bore 5.5 m quadrupole magnets are intended to operate in superfluid helium at 1.9 K with a nominal field gradient of 215 T/m. Fabrication and testing of these magnets has begun at Fermilab. Magnetic field measurements of the first magnets produced are described and compared with results from prototype magnets as well as with requirements set by machine performance studies. [ABSTRACT FROM AUTHOR]