Liquid Nitrogen Tests of a Torus Coil for the Jefferson Lab 12-GeV Accelerator Upgrade

Legg, R.; Kashy, D.; Fair, Ruben; Ghoshal, Probir K.; Bachimanchi, Rama; Bruhwel, K.; Taylor, Mark A.; Fischer, J.; Machie, D.; Powers, Jacob R.

doi:10.1109/tasc.2014.2360139

Cited by 6 publications

(5 citation statements)

References 3 publications

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“…Upon arrival, each coil was inspected, instrumented with temperature sensors and strain gauges, and underwent a cool down test to 80 K (see Fig. 30) to assess the robustness of the coil's electrical insulation and its structural integrity, as well as to test the efficacy of the employed conduction cooling method [36]. Table XXVII summarizes the results obtained from the 80 K test, data extrapolation to 4 K, and comparison with the results obtained from the finite element analysis.…”

Section: K Cold Test and Cryostatingmentioning

confidence: 99%

The CLAS12 superconducting magnets

Fair¹,

Baltzell²,

Bachimanchi³

et al. 2020

Nuclear Instruments and Methods in Physics Research Section A:

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Section: K Cold Test and Cryostatingmentioning

confidence: 99%

The CLAS12 superconducting magnets

Fair¹,

Baltzell²,

Bachimanchi³

et al. 2020

Nuclear Instruments and Methods in Physics Research Section A:

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“…The 12 GeV team was thus encouraged to explore alternatives. The team reviewed the pros and cons of a 4 K test versus an 80 K test and concluded that the 'high' and 'medium' category risks could be sufficiently mitigated by subjecting each torus coil to an 80 K test by flowing liquid nitrogen through each coil's cooling tubes [21]. An extract from the team's review report is provided in table 5.…”

Section: Risk Mitigation Strategy-sensors and Technologymentioning

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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“…After finished coils passed their receipt inspection at JLab, they were fully instrumented with temperature sensors and strain gages in preparation for an 80 K cold test [9], which was part of the Cryostat Factory task. The aim of this test was to verify the integrity of the coil's electrical insulation at cryogenic temperatures as well as to confirm the efficacy of the CCM's conduction cooling methodology.…”

Section: Cryostat Factorymentioning

confidence: 99%

The CLAS12 Torus Detector Magnet at Jefferson Laboratory

Luongo

Ballard

Biallas

et al. 2016

IEEE Trans. Appl. Supercond.

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The CLAS12 Torus is a toroidal superconducting magnet, part of the detector for the 12 GeV accelerator upgrade at Jefferson Lab. The coils were wound/fabricated by Fermilab, with JLab responsible for all other parts of the project scope, including design, integration, cryostating the individual coils, installation, cryogenics, I&C, etc. The paper provides an overview of the CLAS12 Torus magnet features, and serves as a status report of its installation in the experimental hall. Completion and commissioning of the magnet is expected in 2016.

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Liquid Nitrogen Tests of a Torus Coil for the Jefferson Lab 12-GeV Accelerator Upgrade

Cited by 6 publications

References 3 publications

The CLAS12 superconducting magnets

The CLAS12 superconducting magnets

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

The CLAS12 Torus Detector Magnet at Jefferson Laboratory

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