Superconducting shielding with Pb and Nb tubes for momentum sensitive measurements of neutral antimatter

Hinterberger, A.; Gerber, S.; Doser, M.

doi:10.1088/1748-0221/12/09/t09002

Cited by 7 publications

(11 citation statements)

References 25 publications

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“…One such major source of decoherence is the fluctuating magnetic field that may exist around the experiment. However, this can be effectively reduced to picotesla level or ≈30 Hz using a superconducting shield [53]. This is significantly lower than the 10GHz tunnel splitting found above.…”

Section: Decoherencementioning

confidence: 73%

Large spatial Schrödinger cat state using a levitated ferrimagnetic nanoparticle

Rahman¹

2019

New J. Phys.

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The superposition principle is one of the main tenets of quantum mechanics. Despite its counterintuitiveness, it has been experimentally verified using electrons, photons, atoms, and molecules. However, a similar experimental demonstration using a nano or a micro particle is non-existent. Here in this article, exploiting macroscopic quantum coherence and quantum tunneling, we propose an experiment using a levitated magnetic nanoparticle to demonstrate such an effect. It is shown that the spatial separation between the delocalized wavepackets of a 20nm ferrimagnetic yttrium iron garnet (YIG) nanoparticle can be as large as 5 μm. We argue that, in addition to using for testing one of the most fundamental aspects of quantum mechanics, this scheme can simultaneously be used to test different modifications, such as wavefunction collapse models, to the standard quantum mechanics. Furthermore, we show that the spatial superposition of a core-shell structure, a YIG core and a nonmagnetic silica shell, can be used to probe quantum gravity.

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Section: Decoherencementioning

confidence: 73%

Large spatial Schrödinger cat state using a levitated ferrimagnetic nanoparticle

Rahman¹

2019

New J. Phys.

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“…Gravitational effects in particular are easily masked by couplings of the antimatter probes to other fields, particularly magnetic fields and their gradients. While shielding of magnetic fields close to the environment of a Penning trap to sub-μG levels has been established [3], a level allowing one in principle to also work with Rydberg antihydrogen, achieving a homogeneity of better than only 1 part in 10 4 inside a magnet is already very challenging. An additional advantage of extracting a beam of atoms into a region outside of magnets encased in cryostats is the greater geometrical access that this allows for laser light, for example, in contrast to the very strong constraints imposed by a radially limited Penning trap environment deeply embedded inside a magnet.…”

Section: Advantages Of An Antihydrogen Beammentioning

confidence: 99%

“…On the one hand, a number of measurements are expected to be statistically limited, in particular measurements on gravitationally deflected antihydrogen beams (as the effect of external field gradients, one of the main systematics, can be kept to levels that do not play a role at the per cent level [3]). On the other hand, only few antiproton cooling techniques exist that would lead to forming antihydrogen with temperatures of O(K) through charge exchange (for which the antiproton temperature plays the dominant role); one of these is evaporative cooling of antiprotons [14].…”

Section: Improvements: Rate Temperaturementioning

confidence: 99%

AEgIS at ELENA: outlook for physics with a pulsed cold antihydrogen beam

Doser

Aghion

Amsler

et al. 2018

Phil. Trans. R. Soc. A.

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The efficient production of cold antihydrogen atoms in particle traps at CERN's Antiproton Decelerator has opened up the possibility of performing direct measurements of the Earth's gravitational acceleration on purely antimatter bodies. The goal of the AEgIS collaboration is to measure the value of for antimatter using a pulsed source of cold antihydrogen and a Moiré deflectometer/Talbot-Lau interferometer. The same antihydrogen beam is also very well suited to measuring precisely the ground-state hyperfine splitting of the anti-atom. The antihydrogen formation mechanism chosen by AEgIS is resonant charge exchange between cold antiprotons and Rydberg positronium. A series of technical developments regarding positrons and positronium (Ps formation in a dedicated room-temperature target, spectroscopy of the=1-3 and =3-15 transitions in Ps, Ps formation in a target at 10 K inside the 1 T magnetic field of the experiment) as well as antiprotons (high-efficiency trapping of [Formula: see text], radial compression to sub-millimetre radii of mixed [Formula: see text] plasmas in 1 T field, high-efficiency transfer of [Formula: see text] to the antihydrogen production trap using an in-flight launch and recapture procedure) were successfully implemented. Two further critical steps that are germane mainly to charge exchange formation of antihydrogen-cooling of antiprotons and formation of a beam of antihydrogen-are being addressed in parallel. The coming of ELENA will allow, in the very near future, the number of trappable antiprotons to be increased by more than a factor of 50. For the antihydrogen production scheme chosen by AEgIS, this will be reflected in a corresponding increase of produced antihydrogen atoms, leading to a significant reduction of measurement times and providing a path towards high-precision measurements.This article is part of the Theo Murphy meeting issue 'Antiproton physics in the ELENA era'.

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“…In order for the experiment to achieve design sensitivity, a shielding factor of approximately 10 8 is needed at frequencies of 50 − 100 Hz 2 . Such shielding factors have been achieved for example with solid Nb superconducting tubes 12 . The approach described in this paper requires (at least partial) use of thin film superconducting shielding, due to the requirement of very close proximity (a distance of order λ a or less) between the 3 He sample and sprocket mass.…”

Section: A Ordinary Magnetic Noisementioning

confidence: 99%

A method for controlling the magnetic field near a superconducting boundary in the ARIADNE axion experiment

Fosbinder-Elkins¹,

Dargert²,

Harkness³

et al. 2017

Preprint

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The QCD Axion is a particle postulated to exist since the 1970s to explain the Strong-CP problem in particle physics. It could also account for all of the observed Dark Matter in the universe. The Axion Resonant InterAction DetectioN Experiment (ARIADNE) experiment intends to detect the QCD axion by sensing the fictitious "magnetic field" created by its coupling to spin. The experiment must be sensitive to magnetic fields below the 10 −19 T level to achieve its design sensitivity, necessitating tight control of the experiment's magnetic environment. We describe a method for controlling three aspects of that environment which would otherwise limit the experimental sensitivity. Firstly, a system of superconducting magnetic shielding is described to screen ordinary magnetic noise from the sample volume at the 10 8 level. Secondly, a method for reducing magnetic field gradients within the sample up to 10 2 times is described, using a simple and cost-effective design geometry. Thirdly, a novel coil design is introduced which allows the generation of fields similar to those produced by Helmholtz coils in regions directly abutting superconducting boundaries. The methods may be generally useful for magnetic field control near superconducting boundaries in other experiments where similar considerations apply.

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Superconducting shielding with Pb and Nb tubes for momentum sensitive measurements of neutral antimatter

Cited by 7 publications

References 25 publications

Large spatial Schrödinger cat state using a levitated ferrimagnetic nanoparticle

Large spatial Schrödinger cat state using a levitated ferrimagnetic nanoparticle

AEgIS at ELENA: outlook for physics with a pulsed cold antihydrogen beam

A method for controlling the magnetic field near a superconducting boundary in the ARIADNE axion experiment

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