Recent improvements in superconducting cable for accelerator dipole magnets

Fermi National Accelerator Laboratory (Fermilab) fabricated the torus magnet coils for the 12 GeV Hall B upgrade at Jefferson Laboratory (JLab). The production consisted of 6 large superconducting coils for the magnet and 2 spare coils. The toroidal field coils are approximately 2 m x 4 m x 5 cm thick. Each of these coils consists of two layers, each of which has 117 turns of copper-stabilized superconducting cable which will be conduction cooled by supercritical helium. Due to the size of the coils and their unique geometry, Fermilab designed and fabricated specialized tooling and, together with JLab, developed unique manufacturing techniques for each stage of the coil construction. This paper describes the tooling and manufacturing techniques required to produce the six production coils and two spare coils needed by the project.

Section: Magnet and Coil Designmentioning

confidence: 99%

Overview of Torus Magnet Coil Production at Fermilab for the Jefferson Lab 12-GeV Hall B Upgrade

Krave

Velev

Makarov

et al. 2016

“…2. Each of the six coils for the torus consists of 234 turns of SSC 36 strand outer superconducting cable [7] soldered into a copper stabilizer, total length per coil of ~2000 m. The six coils produce a peak magnetic field of 3.58 T when powered at 3770 A. The magnet will have an overall inductance of 2.…”

Section: Torus Magnet and Coil Descriptionmentioning

confidence: 99%

Design and Manufacture of the Conduction Cooled Torus Coils for The Jefferson Laboratory 12-GeV Upgrade

Wiseman

Elementi

Elouadhiri

et al. 2015

The design of the 12 GeV Torus required the construction of six superconducting coils with a unique geometry required for the experimental needs of Jefferson Labs Hall B. Each of these coils consists of 234 turns of copper stabilized superconducting cable conduction cooled by 4.6 K helium gas. The finished coils are each roughly 2 X 4 X 0.05 meters and supported in an aluminum coil case. Because of its geometry new tooling and manufacturing methods had to be developed for each stage of construction. The tooling was designed and developed while producing a practice coil at Fermi National Laboratory. This paper describes the tooling and manufacturing techniques required to produce the six production coils and two spare coils required by the project. Project status and future plans are also presented.

“…Each coil is wound using surplus, 36 strand, bare NbTi Rutherford cable from the Superconducting Super Collider dipole, originally intended for its outer shell [3]. JLab is soldering the cable into a copper channel and insulating it.…”

Section: Introductionmentioning

confidence: 99%

FMEA on the Superconducting Torus for the Jefferson Lab 12 GeV Accelerator Upgrade

Ghoshal

Biallas

Fair

et al. 2015

As part of the Jefferson Lab 12 GeV accelerator upgrade project, Hall B requires two conduction cooled superconducting magnets. One is a magnet system consisting of six superconducting trapezoidal racetrack-type coils assembled in a toroidal configuration and the second is an actively shielded solenoidal magnet system consisting of five coils. Both magnets are to be wound with Superconducting Super Collider-36 NbTi strand Rutherford cable soldered into a copper channel. This paper describes This paper describes a failure modes and effects analysis (FMEA) that was done on these magnets to identify their various failure modes, which were assessed in terms of their Risk Priority Numbers (RPN). Mitigating actions were identified that would reduce the RPNs to acceptable values.Index Terms-Conduction cooled, failure modes and effects analysis (FMEA), magnet quench protection, SSC-NbTi rutherford cable, superconducting magnet, torus.