A Finite Element Model for Mechanical Analysis of LHC Main Dipole Magnet Coils

Pojer, Mirko; Devred, A.; Scandale, W.

doi:10.1109/tasc.2007.898078

Cited by 2 publications

(2 citation statements)

References 6 publications

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“…Electromagnetic and structural analyses of the coil pack and coil case assembly were carried out. The analyses focused on the cool down process, normal operation at full operating current (which also included gravity loads), as well as on conditions arising from coil misalignment, current imbalances, and quench events, to ensure that the aforementioned components were all within acceptable stress limits (see Table VIII) [8,[9][10][11][12][13][14]. Primary stresses were limited to the lesser of 2/3 times the yield strength or 1/3 times the ultimate tensile strength.…”

Section: Table V Summary Of Torus Conductor Stability Assessmentmentioning

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: Table V Summary Of Torus Conductor Stability Assessmentmentioning

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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“…A detailed fault current and structural analysis was carried out for the solenoid magnet [12][13][14][15][16][17]. Studies of various fault conditions indicated that three critical scenarios can result, namely a very inhomogeneous field at the magnetic center of the magnet, a lower central field and a large stray field.…”

Section: Mechanicalmentioning

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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A Finite Element Model for Mechanical Analysis of LHC Main Dipole Magnet Coils

Cited by 2 publications

References 6 publications

The CLAS12 superconducting magnets

The CLAS12 superconducting magnets

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

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