A SQUID magnetometry system for a cryogenic neutron electric dipole moment experiment

Henry, S. G. B.; Clarke, Christine; Cottle, A.; Lynch, A.; Pipe, M.

doi:10.1016/j.nima.2014.06.069

Cited by 3 publications

(1 citation statement)

References 47 publications

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“…The Oxford University Department of Physics has developed new hardware and software techniques to monitor magnetic field fluctuations using SQUIDs, as part of a particle physics experiment [2,3]. In collaboration with LSBB and UAPV we conceived a project to search for the magnetic signal from groundwater flow.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous geomagnetic monitoring with multiple SQUIDs and fluxgate sensors across underground laboratories

et al. 2016

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Abstract. For two periods of several weeks duration in spring and autumn 2014, we monitored fluctuations in the geomagnetic field using 3-axis SQUID magnetometers at three locations within the LSBB tunnel network. Measurements at the water flow point C, and the GAS gallery supplemented the measurements by the permanent [SQUID] 2 system in the Capsule. The frequency spectra of the magnetic fluctuations varied considerably between the three locations. These measurements have provided a unique data set to investigate the potential of underground SQUIDs to monitor the gradient of geomagnetic signals and thus investigate magnetotelluric effects and possible seasonal effects due to changes in the water content of the surrounding rock. We also compared the measurements of a SQUID and fluxgate system, and report on fluxgate measurements at the Boulby Underground Laboratory.

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Section: Introductionmentioning

confidence: 99%

Simultaneous geomagnetic monitoring with multiple SQUIDs and fluxgate sensors across underground laboratories

et al. 2016

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Characterisation of superconducting capillaries for magnetic shielding of twisted-wire pairs in a neutron electric dipole moment experiment

Henry¹,

Pipe²,

Cottle³

et al. 2014

Nuclear Instruments and Methods in Physics Research Section A:

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The cryoEDM neutron electric dipole moment experiment requires a SQUID magnetometry system with pick-up loops inside a magnetically shielded volume connected to SQUID sensors by long (up to 2m) twisted-wire pairs (TWPs). These wires run outside the main shield, and therefore must run through superconducting capillaries to screen unwanted magnetic pick-up. Superconducting capillaries can be produced by extruding the flux core of solder wire. After heating the solder wire in turpentine for an extended period of time, the flux is removed and a wire can be threaded through lengths of up to 1m. We show that the average measured transverse magnetic pick-up of a set of lengths of TWPs is equivalent to a loop area of 5.0×10 −6 m 2 /m, or 14 twists per metre. From this we set the requirement that the magnetic shielding factor of the superconducting capillaries used in the cryoEDM system must be greater than 2.0×10 4 . The shielding factorthe ratio of the signal picked-up by an unshielded TWP to that induced in a shielded TWP was measured for a selection of capillaries. We conclude the transverse shielding factor of a uniform capillary is greater than 10 7 . The measured pick-up was equal to, or less than that due to direct coupling to the SQUID sensor (measured without any TWP attached). We show that discontinuities in the capillaries substantially impair the magnetic shielding, yet if suitably repaired, this can be restored to the shielding factor of an unbroken capillary. We have constructed shielding assemblies for cryoEDM made from lengths of single core and triple core solder capillaries, joined by a shielded Pb cylinder, incorporating a heater to heat the wires above the superconducting transition as required.

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SQUID Sensor Technology: Fundamental Principle and Applications in ASW Operation and Geophysical Exploration

Khan,

Ajaz,

Irfan

et al. 2023

2023 20th International Bhurban Conference on Applied Sciences and Technology (IBCAST)

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A SQUID magnetometry system for a cryogenic neutron electric dipole moment experiment

Cited by 3 publications

References 47 publications

Simultaneous geomagnetic monitoring with multiple SQUIDs and fluxgate sensors across underground laboratories

Simultaneous geomagnetic monitoring with multiple SQUIDs and fluxgate sensors across underground laboratories

Characterisation of superconducting capillaries for magnetic shielding of twisted-wire pairs in a neutron electric dipole moment experiment

SQUID Sensor Technology: Fundamental Principle and Applications in ASW Operation and Geophysical Exploration

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