Superconducting Solenoid System with Adjustable Shielding Factor for Precision Measurements of the Properties of the Antiproton

Devlin, J. A.; Wursten, E.; Harrington, James A.; Higuchi, Takashi; Blessing, Pascal E.; Borchert, M. J.; Erlewein, Stefan; Hansen, Jannek J.; Morgner, Jonathan; Bohman, Matthew; Mooser, A.; Smorra, Christian; Wiesinger, M.; Blaum, Klaus; Matsuda, Y.; Ospelkaus, C.; Quint, W.; Walz, J.; Yamazaki, Y.; Ulmer, S.

doi:10.1103/physrevapplied.12.044012

Cited by 9 publications

(5 citation statements)

References 34 publications

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“…The fourfold improvement was achieved due to many technological improvements that were implemented into the experiment, namely new cryostat-to-trap connections and decoupled mechanical support of the experiment, homogenization of the magnetic field, the implementation of a superconducting multi-layer magnetic shielding system [ 25 ], and the development of a new highly sensitive tuneable axial detector, which eliminated the main systematic uncertainty of the previous experiment related to the need of re-adjusting the trap voltage separately for the antiproton and the H -ion.…”

Section: Proton-to-antiproton Charge-to-mass Ratio Comparison At 16 P...mentioning

confidence: 99%

“…making the spin-flip spectroscopy robust with respect to frequency fluctuations caused by changing magnetic fields inside the AD/ELENA facility. To reduce this effect, we installed a multi-layer superconducting shielding system, which decreases some external magnetic field disturbances by up to a factor of [ 25 ]. We expect that this upgrade will allow us to reduce the width of the Larmor resonance at least to the 1 p.p.b.…”

Section: Towards a 100 Ppt Antiproton/proton/hydrogen Ion M...mentioning

confidence: 99%

“…Based on these experimental upgrades and inspired by the goal to further improve the resolution of our g -factor measurements, we have implemented peak and phase-sensitive frequency measurement methods. Combined with the multi-layer superconducting shielding system [ 25 ], we have reached with these methods frequency scatters of p.p.t. for peak-based measurements and p.p.t.…”

Section: Towards a 100 Ppt Antiproton/proton/hydrogen Ion M...mentioning

confidence: 99%

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BASE—high-precision comparisons of the fundamental properties of protons and antiprotons

et al. 2023

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The BASE collaboration at the antiproton decelerator/ELENA facility of CERN compares the fundamental properties of protons and antiprotons with ultra-high precision. Using advanced Penning trap systems, we have measured the proton and antiproton magnetic moments with fractional uncertainties of 300 parts in a trillion (p.p.t.) and 1.5 parts in a billion (p.p.b.), respectively. The combined measurements improve the resolution of the previous best test in that sector by more than a factor of 3000. Very recently, we have compared the antiproton/proton charge-to-mass ratios with a fractional precision of 16 p.p.t., which improved the previous best measurement by a factor of 4.3. These results allowed us also to perform a differential matter/antimatter clock comparison test to limits better than $$3\,$$ 3 %. Our measurements enable us to set limits on 22 coefficients of CPT- and Lorentz-violating standard model extensions (SME) and to search for potentially asymmetric interactions between antimatter and dark matter. In this article, we review some of the recent achievements and outline recent progress towards a planned improved measurement of the antiproton magnetic moment with an at least tenfold improved fractional accuracy. Graphic Abstract

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Section: Proton-to-antiproton Charge-to-mass Ratio Comparison At 16 P...mentioning

confidence: 99%

Section: Towards a 100 Ppt Antiproton/proton/hydrogen Ion M...mentioning

confidence: 99%

Section: Towards a 100 Ppt Antiproton/proton/hydrogen Ion M...mentioning

confidence: 99%

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BASE—high-precision comparisons of the fundamental properties of protons and antiprotons

et al. 2023

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“…With all the remarkable high-precision results coming from advanced accelerator laboratories, one may not immediately realize that magnetometry in such an environment may, indeed, be especially challenging. As is well documented, for example, for the CERN Antipro- ton Decelerator hall [238] and the neutron electric-dipole moment (nEDM) experiment at the Paul Scherrer Institute [239], there are multiple sources of spurious magnetic fields with diverse signatures such as pulsed extraction magnets, overhead cranes, and various other activities and devices associated with operation of the facility. Here active and passive shielding, as well as monitoring stray fields outside the experimental region are among the possible mitigation approaches.…”

Section: J Magnetometry At Accelerator Facilitiesmentioning

confidence: 99%

Sensitive magnetometry in challenging environments

Fu¹,

Iwata²,

Wickenbrock³

et al. 2020

Preprint

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State-of-the-art magnetic field measurements performed in shielded environments with carefully controlled conditions rarely reflect the realities of those applications envisioned in the introductions of peer-reviewed publications. Nevertheless, significant advances in magnetometer sensitivity have been accompanied by serious attempts to bring these magnetometers into the challenging working environments in which they are often required. In this review, we cover the ways in which various magnetometer technologies have been adapted for use in challenging environments.

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“…Existing methods for field stabilization can be grouped into passive and active techniques. Passive methods typically employ a superconducting shield with a coil-specific geometry chosen to cancel field fluctuations in the region of interest [14,15]. In active techniques, flux is transferred in and out of the superconducting loop by means of a flux pumping sequence [8,16], enabling not only active stabilization, but also the ability to adjust the nominal value of the persistent current.…”

Section: Introductionmentioning

confidence: 99%

Stabilization and control of persistent current magnets using variable inductance

Brouwer¹,

Shen²,

Norris³

et al. 2022

Supercond. Sci. Technol.

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Ultra-stable, tunable magnetic ﬁelds are desirable for a wide range of applications in medical imaging, electron microscopy, quantum science, and atomic physics. Superconducting magnets operated in persistent current mode, with device current ﬂowing in a closed superconducting loop disconnected from a power source, are a common approach for applications with the most stringent requirements on temporal ﬁeld stability. We present a method for active control of this persistent current by means of dynamic inductance change within the superconducting circuit. For a ﬁrst realization of this general technique, we consider a variable superconducting inductor placed in series with the main magnet. The inductor acts as a dynamic ﬂux storage device capable of transferring ﬂux to or from the main magnet through inductance change. This allows for ﬁne and fast adjustments of the persistent current without the use of thermal switches that limit the speed and accuracy of many present-day methods. With ﬁrst experiments employing this technique, we demonstrate stabilization of a 1.95 T Nb-Ti round lens for electron microscopy against decay resulting from residual losses in the superconducting circuit, and more generally show ﬂexibility for precise control over the magnitude and waveform of the persistent current.

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Superconducting Solenoid System with Adjustable Shielding Factor for Precision Measurements of the Properties of the Antiproton

Cited by 9 publications

References 34 publications

BASE—high-precision comparisons of the fundamental properties of protons and antiprotons

BASE—high-precision comparisons of the fundamental properties of protons and antiprotons

Sensitive magnetometry in challenging environments

Stabilization and control of persistent current magnets using variable inductance

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