Thermal analysis of SC quadrupoles in accelerator interaction regions

This paper presents results of a thermal analysis and operation margin calculation performed for NbTi and Nb{sub 3}Sn low-beta quadrupoles in collider interaction regions. Results of the thermal analysis for NbTi quadrupoles are compared with the relevant experimental data. An approach to quench limit measurements for Nb{sub 3}Sn quadrupoles is discussed

Design Studies of Nb3Sn High-Gradient Quadrupole Models for LARP

Insertion quadrupoles with large aperture and high gradient are required to achieve the luminosity upgrade goal of 10{sup 35} cm{sup -2} s{sup -1} at the Large Hadron Collider (LHC). In 2004, the US Department of Energy established the LHC Accelerator Research Program (LARP) to develop a technology base for the upgrade. Nb{sub 3}Sn conductor is required in order to operate at high field and with sufficient temperature margin. We report here on the conceptual design studies of a series of 1 m long 'High-gradient Quadrupoles' (HQ) that will explore the magnet performance limits in terms of peak fields, forces and stresses. The HQ design is expected to provide coil peak fields of more than 15 T, corresponding to gradients above 300 T/m in a 90 mm bore. Conductor requirements, magnetic, mechanical and quench protection issues for candidate HQ designs will be presented and discussed

Development of a single-layer Nb3Sn common coil dipole model

A high-field dipole magnet based on the common coil design was developed at Fermilab for a future Very Large Hadron Collider. A short model of this magnet with a design field of 11 T in two 40-mm apertures is being fabricated using the react-and-wind technique. In order to study and optimize the magnet design two 165-mm long mechanical models were assembled and tested. A technological model consisting of magnet straight section and ends was also fabricated in order to check the tooling and the winding and assembly procedures. This paper describes the design and technology of the common coil dipole magnet and summarizes the status of short model fabrication.The results of the mechanical model tests and comparison with FE mechanical analysis are also presented

Thermal analysis of SC quadrupoles in accelerator interaction regions

Abstract-This paper presents results of a thermal analysis and operation margin calculation performed for NbTi and Nb 3 Sn low-beta quadrupoles in collider interaction regions. Results of the thermal analysis for NbTi quadrupoles are compared with the relevant experimental data. An approach to quench limit measurements for Nb A. Magnet Design and ANSYS Thermal Model For a consistent comparison of NbTi and Nb 3 Sn IR quadrupoles the thermal analysis was performed for magnets with equivalent design and performance parameters. These IR quadrupoles were developed as candidates for the LHC IRs. Quadrupole cross-sections are shown in 3 Sn quadrupoles is discussed. Index Terms-Superconducting quadrupole, interaction region, operation margin, thermal analysis, temperature margin, quench limit

Assembly and Tests of Mechanical Models of the 15-T Nb3_3Sn Dipole Demonstrator

Within the U.S. magnet development program, Fermilab is developing a 15-T Nb$_3$Sn dipole demonstrator. Prior to the construction of the real magnet model, short sections and the whole structure were instrumented with strain gauges and assembled to validate the results of structural analysis, check tooling, and to gain experience with the assembly of the real magnet components. This paper summarizes the lessons learned from these mechanical models and compares the measured data with the finite-element analysis

Magnetic and Mechanical Analysis of the HQ Model Quadrupole Designs for LARP

Insertion quadrupoles with large bore and high gradient are required to upgrade the luminosity of the large hadron collider (LHC). The US LHC accelerator research program is developing Nb$_3$Sn technology for the upgrade. This effort includes a series of 1 m long technology quadrupoles (TQ), to demonstrate the reproducibility at moderate field, and high-gradient quadrupoles (HQ) to explore the magnet performance limits in terms of peak fields, forces and stresses. The HQ models are expected to achieve peak fields of 15 T or higher. A coil aperture of 90 mm, corresponding to gradients above 300 T/m, was chosen as the baseline. Peak stresses above 150 MPa are expected. Progress on the magnetic and mechanical design of the HQ models will be reported