Magnetic field stabilization for magnetically shielded volumes by external field coils

Bryś, T.; Czekaj, S.; Daum, M.; Fierlinger, P.; George, David C.; Henneck, R.; Kasprzak, M.; Kirch, K.; Kuźniak, M.; Kuehne, G.; Pichlmaier, A.; Siódmok, Andrzej; Szelc, A.; Tanner, L H; Assmann, C.; Bechstein, S.; Drung, D.; Schurig, T.; Ciofi, C.; Neri, Bruno

doi:10.1016/j.nima.2005.08.040

Cited by 22 publications

(16 citation statements)

References 17 publications

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“…Magnetic field noise can be actively cancelled by modulating the coil current to stabilize the output of a magnetometer in a feedforward or feedback configuration; possible magnetometers include fluxgates 16,17 or sense coils 18,19 . A limitation of this approach arises when the magnetometer cannot be located at the site of interest, for example due to physical constraints in the apparatus or saturation of the sensor.…”

Section: Introductionmentioning

confidence: 99%

“…In this case, the field at the sensor may not perfectly track the field in the region of interest, leading to imperfect noise suppression. 16,17 While the control of magnetic fields of a few hundred microtesla at a level of 2.5 ppm had been demonstrated using feedback and feedforward techniques, 20 the stabilisation of fields of tens of millitesla remains challenging due to the greater impact of coil current noise. 21 In this work, we present a setup to produce a 14.6 mT field with 0.29(1) ppm rms noise.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic field stabilization system for atomic physics experiments

Merkel

Thirumalai

Tarlton

et al. 2019

Review of Scientific Instruments

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Atomic physics experiments commonly use millitesla-scale magnetic fields to provide a quantization axis. As atomic transition frequencies depend on the magnitude of this field, many experiments require a stable absolute field. Most setups use electromagnets, which require a power supply stability not usually met by commercially available units. We demonstrate stabilization of a field of 14.6 mT to 4.3 nT rms noise (0.29 ppm), compared to noise of > 100 nT without any stabilization. The rms noise is measured using a field-dependent hyperfine transition in a single 43 Ca + ion held in a Paul trap at the centre of the magnetic field coils. For the 43 Ca + "atomic clock" qubit transition at 14.6 mT, which depends on the field only in second order, this would yield a projected coherence time of many hours. Our system consists of a feedback loop and a feedforward circuit that control the current through the field coils and could easily be adapted to other field amplitudes, making it suitable for other applications such as neutral atom traps.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Magnetic field stabilization system for atomic physics experiments

Merkel

Thirumalai

Tarlton

et al. 2019

Review of Scientific Instruments

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show abstract

“…A detailed understanding of passive and active magnetic shielding, magnetic field generation within shielded volumes, and precision magnetometry is expected to be crucial to achieve the systematic error goals for the next generation of experiments. Much of the research and development efforts for these experiments are focused on careful design and testing of various magnetic shield geometries with precision magnetometers [11,12,13,14,15].…”

Section: Introductionmentioning

confidence: 99%

“…Unfortunately the magnetic field in the experiment is never stable to this level. For this reason, experiments use a comagnetometer and/or surrounding atomic magnetometers to measure and correct the magnetic field to this level [9,11,12]. Drifts of 1-10 pT in B 0 may be corrected using the comagnetometer technique, setting a goal magnetic stability for the B 0 field generation system in a typical nEDM experiment.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity of fields generated within magnetically shielded volumes to changes in magnetic permeability

Andalib

Martin

Bidinosti

et al. 2017

Nuclear Instruments and Methods in Physics Research Section A:

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Future experiments seeking to measure the neutron electric dipole moment (nEDM) require stable and homogeneous magnetic fields. Normally these experiments use a coil internal to a passively magnetically shielded volume to generate the magnetic field. The stability of the magnetic field generated by the coil within the magnetically shielded volume may be influenced by a number of factors. The factor studied here is the dependence of the internally generated field on the magnetic permeability µ of the shield material. We provide measurements of the temperature-dependence of the permeability of the material used in a set of prototype magnetic shields, using experimental parameters nearer to those of nEDM experiments than previously reported in the literature. Our measurements imply a range of 1 µ dµ dT from 0-2.7%/K. Assuming typical nEDM experiment coil and shield parameters gives µ B0 dB0 dµ = 0.01, resulting in a temperature dependence of the magnetic field in a typical nEDM experiment of dB0 dT = 0 − 270 pT/K for B 0 = 1 µT. The results are useful for estimating the necessary level of temperature control in nEDM experiments.

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“…A detailed understanding of passive and active magnetic shielding, magnetic field generation within shielded volumes, and precision magnetometry is expected to be crucial to achieve the systematic error goals for the next generation of experiments. Much of the R&D effort for these experiments is focused on careful design and testing of various magnetic shield geometries with precision magnetometers [11,12,13,14,15].…”

Section: Introductionmentioning

confidence: 99%

Large magnetic shielding factor measured by nonlinear magneto-optical rotation

Martin

Mammei

Klassen

et al. 2015

Nuclear Instruments and Methods in Physics Research Section A:

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A passive magnetic shield was designed and constructed for magnetometer tests for the future neutron electric dipole moment experiment at TRIUMF. The axial shielding factor of the magnetic shield was measured using a magnetometer based on non-linear magneto-optical rotation of the plane of polarized laser light upon passage through a paraffin-coated vapour cell containing natural Rb at room temperature. The laser was tuned to the Rb D1 line, near the 85 Rb F = 2 → 2, 3 transition. The shielding factor was measured by applying an axial field externally and measuring the magnetic field internally using the magnetometer. The axial shielding factor was determined to be (1.3±0.1)×10 7 , from an applied axial field of 1.45 µT in the background of Earth's magnetic field.

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Magnetic field stabilization for magnetically shielded volumes by external field coils

Cited by 22 publications

References 17 publications

Magnetic field stabilization system for atomic physics experiments

Magnetic field stabilization system for atomic physics experiments

Sensitivity of fields generated within magnetically shielded volumes to changes in magnetic permeability

Large magnetic shielding factor measured by nonlinear magneto-optical rotation

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