Solid-state nuclear magnetic resonance magnetometry at low temperature with application to antimatter gravity experiments by ALPHA

Theses

The Einstein Equivalence Principle (EEP) has never been directly examined with an antimatter test body. To address this, ALPHA is planning to measure the Earth’s gravitational field using antihydrogen atoms as test masses. The experiment calls for the careful release of antiatoms from a magnetic trap and requires precise characterization of the magnetic fields that are used.

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University of British Columbia

Nathan Evetts

First Measurement of Antihydrogen Free Fall Using a Radial Time Projection Chamber

Theses

Using antihydrogen, an apparatus known as ALPHA-g was designed to test Einstein's Weak Equivalence Principle (WEP), where the acceleration due to gravity that a body experiences is independent of its structure or composition. A measurement of the gravitational mass of antimatter has never been done before, as previous experiments used charged particles, which meant the experiments were dominated by electromagnetic forces. The ALPHA-g apparatus uses electrically neutral antihydrogen atoms produced in a vertical Penning-Malmberg trap and trapped in a magnetic minimum trap.

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University of Calgary

Pooja Devi Woosaree
 

Magnetic Field Characterisation for Gravitational Free Fall Measurements of Antihydrogen in the ALPHA-g Experiment

Theses

The bound state of an antiproton and positron, antihydrogen, is an ideal test particle for comparisons between matter and antimatter as hydrogen has been studied extensively through history both experimentally and theoretically. The Antihydrogen Laser Physics Apparatus (ALPHA) collaboration has made significant progress on antihydrogen trapping, cooling, and spectroscopy in recent years.In a new apparatus, ALPHA-g, the collaboration aims to probe the effects of gravity on antimatter.

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University of Calgary

Adam Michael William Powell
 

A proton source in the ALPHA apparatus for precision measurements of antihydrogen and hydrogen

Theses

The apparent lack of antimatter within our local solar system, the Milky Way, and at Galactic boundaries is inconsistent with the Big Bang hypothesis. This disagreement has motivated many experiments to compare the properties and behaviour of antimatter and matter. The ALPHA (Antihydrogen Laser PHysics Apparatus) experiment produce, trap and study antihydrogen. This synthesis involves antiprotons sourced from the limited schedule of the Antiproton Decelerator facility.

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Swansea University

Patrick Mullan

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Liam McCarthy
Researcher
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Roya Ahemeh
Student
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Dr. Rita Behera Sahoo
Researcher
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Adriano Del Vincio
Student

Adiabatic expansion cooling of antihydrogen

Refereed Publication

Magnetically trapped antihydrogen atoms can be cooled by expanding the volume of the trap in which they are confined. We report a proof-of-principle experiment in which antiatoms are deliberately released from expanded and static traps. Antiatoms escape at an average trap depth of 0 . 0 8 ± 0 . 0 1 K (statistical errors only) from the expanded trap while they escape at average depths of 0 . 2 2 ± 0 . 0 1 and 0 . 1 7 ± 0 . 0 1 K from two different static traps.

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Physical Review Research 6 (2024) L032065

Ahmadi, M. and Alves, B. X. R. and Baker, C. J. and Bertsche, W. and Capra, A. and Cohen, S. and Torkzaban, C. and Cesar, C. L. and Charlton, M. and Collister, R. and Eriksson, S. and Evans, A. and Evetts, N. and Fajans, J. and Friesen, T. and Fujiwara, M. C. and Granum, P. and Hangst, J. S. and Hayden, M. E. and Hodgkinson, D. and Isaac, C. A. and Johnson, M. A. and Jones, S. A. and Jonsell, S. and Kalem, N. and Madsen, N. and Maxwell, D. and McKenna, J. T. K. and Menary, S. and Momose, T. and Munich, J. and Olchanski, K. and Olin, A. and Pusa, P. and Rasmussen, C. \O{}. and Robicheaux, F

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