High-precision magnetic field mapping with a three-dimensional Hall probe for a T-violation experiment in Kμ3 decay

Ikeda, Tokihiro; Chapman, Michael; Igarashi, Y.; Imazato, J.; Lee, Jong Man; Khabibullin, M.; Mineev, O.; Shimizu, Hirotaka; Shimizu, S.; Suzuki, Atsushi; Watanabe, A.; Yokoi, T.

doi:10.1016/s0168-9002(97)01024-3

Cited by 6 publications

(2 citation statements)

References 3 publications

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“…Measurements were carried out at 3600 points: 6 (sectors) × 4 (X-Y position) × 3 (dimensions) × 50 (Z-direction). The technique used earlier was experimented by Fry et al and Ikeda et al and was adopted for our measurement system [18,19]. The Hall sensor mapper successfully demonstrated sensor placement, sensor movement, noise level, and data reproducibility better than 0.1% in the laboratory.…”

Section: Magnet Field Mappingmentioning

confidence: 96%

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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Section: Magnet Field Mappingmentioning

confidence: 96%

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

Ghoshal

Bachimanchi

Fair

et al. 2018

Supercond. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…in the direction of the beamline. The mapping equipment consisted of a digital voltmeter, 2-in diameter carbon tube referenced to survey points, three single axis calibrated Hall probes (one for each of the x, y, and z axes) positioned in a cylindrical block of Delrin ® spaced 5 cm apart in the z-direction, and a control system (for motion, datarecording, and interlocks) [40]. A commercially available Group 3 MPT-141 series of transverse Hall probes with a DTM-151 Tesla-meter was used for the field measurement.…”

Section: Solenoid Coolingmentioning

confidence: 99%