Limits of Low Magnetic Field Environments in Magnetic Shields

Sun, Zhiyin; Fierlinger, P.; Han, Jiecai; Li, Liyi; Liu, Tianhao; Schnabel, A.; Stuiber, S.; Voigt, Jens

doi:10.1109/tie.2020.2987267

Cited by 47 publications

(22 citation statements)

References 27 publications

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“…Demagnetization of glass cells for spin-precession measurements with noble gases has been demonstrated previously [27]; the application of this technique to larger and more massive UCN cells remains to be demonstrated. The suppression of ambient magnetic fields with high efficiency [6] and a stability at the ∼10 fT level has also been demonstrated, as well as the reduction of residual fields to a level of 0.1 nT [52,53]. The maximum allowable global gradient is on the order of 50 pT/m, assuming a magnetic field of 5 μT.…”

Section: The Neutron Permanent Electric Dipole Moment (Edm)mentioning

confidence: 79%

Approaches to high-density storage experiments with in-situ production and detection of ultracold neutrons

Degenkolb

Fierlinger

Zimmer

2023

JNR

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Low counting statistics is one of the most important challenges in modern experiments with ultracold neutrons (UCN). UCN densities in superthermal sources based on superfluid helium are normally much higher than those after UCN delivery to ex-situ volumes. Therefore, and due to the vanishing neutron absorption of 4He, storage-based experiments performed in-situ promise significant sensitivity gains. Scalable measurements offer a promising path to simultaneously address the inefficient use of cold neutron beams as precursors for UCN production in 4He, by recuperating the unused beam fraction, and confront the practical challenges of large-scale UCN infrastructure. We suggest strategies for the development of modular cryogenic cells, propose a novel approach for in-situ UCN detection, and discuss the ultimate statistical reach of such a multiplexed experiment for measuring the neutron’s permanent electric dipole moment (EDM). While dedicated research and development are needed to evaluate the feasibility for many requirements, a neutron EDM measurement with sensitivity well beyond 10 − 28 e cm seems possible. Such an experiment could be pursued at any compatible cold neutron beamline, e.g., at the Institut Laue–Langevin, or later using the ANNI facility or large beam port (LBP) at the European Spallation Source.

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Section: The Neutron Permanent Electric Dipole Moment (Edm)mentioning

confidence: 79%

Approaches to high-density storage experiments with in-situ production and detection of ultracold neutrons

Degenkolb

Fierlinger

Zimmer

2023

JNR

Self Cite

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“…A preliminary design of a magnetic shield has been simulated using a model from Ref. [23]. This is based primarily on an outer and inner octagon-shaped passive shield of 1-2 mm thick sheets of mumetal, based on a concept demonstrated in Ref.…”

Section: Work Package 8: Fundamental Physicsmentioning

confidence: 99%

Development of a High Intensity Neutron Source at the European Spallation Source: The HighNESS project

Santoro¹,

Andersen²,

Bernasconi³

et al. 2022

Preprint

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The European Spallation Source (ESS), presently under construction in Lund, Sweden, is a multidisciplinary international laboratory that will operate the world's most powerful pulsed neutron source. Supported by a 3M Euro Research and Innovation Action within the EU Horizon 2020 program, a design study (HighNESS) is now underway to develop a second neutron source below the spallation target. Compared to the first source, located above the spallation target and designed for high cold and thermal brightness, the new source will provide higher intensity, and a shift to longer wavelengths in the spectral regions of cold (2-20 Å), very cold (VCN, 10-120 Å), and ultra cold (UCN, > 500 Å) neutrons. The core of the second source will consist of a large liquid deuterium moderator to deliver a high flux of cold neutrons and to serve secondary VCN and UCN sources, for which different options are under study. The features of these new sources will boost several areas of condensed matter research and will provide unique opportunities in fundamental physics. Part of the HighNESS project is also dedicated to the development of future instruments that will make use of the new source and will complement the initial suite of instruments in construction at ESS. The HighNESS project started in October 2020. In this paper, the ongoing developments and the results obtained in the first year are described.

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“…Calculation of Direct Current (DC) field reduction is not quantitatively possible for very low fields with magnetostatic means. However, the effect of magnetic equilibration is well tested and can be calculated in specific (simple) cases [33,34] and can thus be scaled from a magnetostatic simulation based on a typical mu-metal hysteric curve. Figure 17 shows the fields inside the shield from excitations with 1 to 100 Hz, with an external excitation with the same amplitude.…”

Section: Simulationsmentioning

confidence: 99%

The Development of the NNBAR Experiment

Backman¹,

Barrow²,

Beßler³

et al. 2022

Preprint

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The NNBAR experiment for the European Spallation Source will search for free neutrons converting to antineutrons with a sensitivity improvement of three orders of magnitude compared to the last such search. This paper describes progress towards a conceptual design report for NNBAR. The design of a moderator, neutron reflector, beamline, shielding and annihilation detector is reported. The simulations used form part of a model which will be used for optimisation of the experiment design and quantification of its sensitivity.

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Limits of Low Magnetic Field Environments in Magnetic Shields

Cited by 47 publications

References 27 publications

Approaches to high-density storage experiments with in-situ production and detection of ultracold neutrons

Approaches to high-density storage experiments with in-situ production and detection of ultracold neutrons

Development of a High Intensity Neutron Source at the European Spallation Source: The HighNESS project

The Development of the NNBAR Experiment

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