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

Krave, Steven; Velev, G.; Makarov, A.; Nobrega, F.; Kiemschies, O.; Robotham, B.; Elementi, L.; Elouadhiri, L.; Luongo, C.A.; Kashy, D.; Wiseman, M.

doi:10.1109/tasc.2016.2533264

Cited by 3 publications

(5 citation statements)

References 7 publications

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“…The torus magnet and the Torus Service Tower (TST) were designed and built at JLab; the Cryogenic Distribution Box (DBX), was designed at JLab and fabricated by Meyer Tool, while the coils were fabricated at the Fermi National Accelerator Laboratory (FNAL), USA [4,5]. The solenoid magnet was designed and fabricated by Everson Tesla Inc., USA (ETI), while the Solenoid Service Tower (SST) and cryogenics were designed and fabricated by JLab.…”

Section: Physics Requirements and Technical Specificationsmentioning

confidence: 99%

“…The Magnet Department at FNAL was contracted to wind, insulate, vacuum pressure impregnate the torus coils, and install them in their individual aluminum coil cases before shipping them to JLab. Because of the large size of the coils, FNAL had to develop new tooling and processes to support coil production operations [5,35]. At FNAL the conductor was de-spooled and cleaned once again before being wound onto a specially prepared spool.…”

Section: Coil Winding and Impregnationmentioning

confidence: 99%

See 1 more Smart Citation

The CLAS12 superconducting magnets

Fair¹,

Baltzell²,

Bachimanchi³

et al. 2020

Nuclear Instruments and Methods in Physics Research Section A:

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Section: Physics Requirements and Technical Specificationsmentioning

confidence: 99%

Section: Coil Winding and Impregnationmentioning

confidence: 99%

The CLAS12 superconducting magnets

Fair¹,

Baltzell²,

Bachimanchi³

et al. 2020

Nuclear Instruments and Methods in Physics Research Section A:

Self Cite

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“…The cable was wrapped in E-glass and a layer of G10 sheet was used between coil layers to prevent interlayer shorts. Ground insulation on the edges of the coil consists of multiple layers of half-lapped E-Glass cloth and G10 strips directly adjacent to the cooling tube which is also wrapped in 2 layers of glass tape as shown in Fig 2(c) [2,6]. After coil winding was successfully completed, the coil underwent a 2-step epoxy (CTD101K) impregnation [6].…”

Section: Torus Magnet Design and Coil Manufacturingmentioning

confidence: 99%

“…Ground insulation on the edges of the coil consists of multiple layers of half-lapped E-Glass cloth and G10 strips directly adjacent to the cooling tube which is also wrapped in 2 layers of glass tape as shown in Fig 2(c) [2,6]. After coil winding was successfully completed, the coil underwent a 2-step epoxy (CTD101K) impregnation [6]. After first impregnation and removal from the mold, a full survey of the conductor placement was carried out on both sides of the double pancake coils using photogrammetry followed by the attachment of an additional 360 μm of ground layer insulation before soldering the cooling sheets to the cooling tubes.…”

Section: Torus Magnet Design and Coil Manufacturingmentioning

confidence: 99%

Magnetic Field Mapping of the CLAS12 Torus—A Comparative Study Between the Engineering Model and Measurements at JLab

Ghoshal¹,

Beck²,

Fair³

et al. 2019

IEEE Trans. Appl. Supercond.

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This paper provides an overview of the magnetic field measurement and subsequent electromagnetic re-modeling of the CLAS12 torus during the commissioning of the magnet in the fall of 2016. The CLAS12 detector in Hall B is part of the 12 GeV Accelerator Upgrade project at Jefferson Lab. The torus magnet allows precise determination of particle momenta within a cone ~ (5 0 -40 0 ) in the forward direction. The ability to do this requires we know the ∫B.dl of the torus to within an accuracy of 0.5 % or better. To achieve this, an accurate model of the field along the particle paths is required. The TOSCA code is used to generate a full 3D simulation of the magnetic envelope of the magnet as designed. Experimentally the actual magnetic field within the magnet was surveyed to confirm the model design and to measure the deviation from the ideal case. The magnetic field deviations are attributed to manufacturing variability and assembly tolerances. A final model was created with allowances for these deviations guided by the survey data to create a more precise field integral model which greatly improves momentum resolution capability allowing it to deliver the required specifications.

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“…The solenoid magnet was designed and fabricated by Everson Tesla Inc., USA. The torus magnet was designed and assembled at JLab while the coils were fabricated at the Fermi National Accelerator Laboratory, USA [3]. The overall protection system design, instrumentation and control for both the torus and solenoid have been engineered by JLab.…”

Section: Introductionmentioning

confidence: 99%

Instrumentation and control selection for the 12 GeV Hall B magnets at Jefferson Lab

Ghoshal

Bachimanchi

Fair

et al. 2018

Supercond. Sci. Technol.

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As part of the Jefferson Laboratory (JLab) 12 GeV accelerator upgrade, the experimental physics Hall B detector system requires two superconducting magnets-a torus and a solenoid. The specifications required maximum space for the detectors which led to the choice of conduction cooling for each magnet. The torus consists of six trapezoidal 'race-track'-type coils connected in series with an operating current of 3770 A. The solenoid is an actively shielded 5 Tesla magnet consisting of five coils connected in series operating at 2416 A. Within the hall the two magnets are located in close proximity to each other and are surrounded by particle detectors. We describe the philosophy behind the instrumentation selection and control design that accounts for this proximity and other challenging working conditions. We describe the choice of sensor technologies, as well as the control and data acquisition methods. The magnet power and cryogenic control sub-systems are implemented using Allen Bradley Control-Logix 1756-L72 programmable logic controllers (PLCs). Sensor instrumentation readbacks are routed into the PLC via National Instruments cRIO hardware (field programmable gate arrays or FPGA/RT application) using a JLab-designed FPGA-based multi-sensor-excitation-chassis. Configuration, monitoring, and alarm handlers for the magnet systems are provided via an experimental physics instrumentation and control system interface. Failure modes and effects analysis and the requirement to monitor critical parameters during operation guided the selection of instrumentation and associated hardware. The design of the quench protection and voltage tap sub-systems was driven by the anticipated level of voltages developed during a magnet quench. The primary-hardwired quench detection and protection sub-system together with the secondary PLC based protection sub-system is also discussed. The successful commissioning and subsequent performance of these magnets demonstrates the robustness of the design and implementation approach that was adopted by the JLab team and serves as an excellent 'how to' guide for future projects of this size and complexity.

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

Cited by 3 publications

References 7 publications

The CLAS12 superconducting magnets

The CLAS12 superconducting magnets

Magnetic Field Mapping of the CLAS12 Torus—A Comparative Study Between the Engineering Model and Measurements at JLab

Instrumentation and control selection for the 12 GeV Hall B magnets at Jefferson Lab

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