Category: Publication Content Type
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Magnetic Field Characterisation for Gravitational Free Fall Measurements of Antihydrogen in the ALPHA-g Experiment
Magnetic Field Characterisation for Gravitational Free Fall Measurements of Antihydrogen in the ALPHA-g Experiment 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
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Adiabatic expansion cooling of antihydrogen
Adiabatic expansion cooling of antihydrogen 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 .
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Exploiting Electron Magnetron Motion in a Penning-Malmberg Trap to Measure Patch Potentials, Misalignment, and Magnetic Fields.
Exploiting Electron Magnetron Motion in a Penning-Malmberg Trap to Measure Patch Potentials, Misalignment, and Magnetic Fields. A sequence of electron clouds is extracted from an electron plasma reservoir. These clouds are highly reproducible and their E×B drift motion is nearly identical to that of a single particle, making them useful for measurements of electric and
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Measurements of Penning-Malmberg trap patch potentials and associated performance degradation
Measurements of Penning-Malmberg trap patch potentials and associated performance degradation Antiprotons created by laser ionization of antihydrogen are observed to rapidly escape the ALPHA trap. Further, positron plasmas heat more quickly after the trap is illuminated by laser light for several hours. These phenomena can be caused by patch potentials—variations in the electrical potential along
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Laser-cooled Be+ for improved antihydrogen trapping and magnetometry
Laser-cooled Be+ for improved antihydrogen trapping and magnetometry We have laser cooled beryllium ions in a Penning-Malmberg trap dedicated for antihydrogen formation. This trap is combined with a magnetic minimum trap to confine antihydrogen.This can be used to assist in the studies of antihydrogen in two distinct ways. The first application of the cold 9Be+
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Observation of the effect of gravity on the motion of antimatter
Observation of the effect of gravity on the motion of antimatter Einstein’s general theory of relativity (GR), from 19151, remains the most successful description of gravitation. From the 1919 solar eclipse2 to the observation of gravitational waves3, the theory has passed many crucial experimental tests. However, the evolving concepts of dark matter and dark energy
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A proton source in the ALPHA apparatus for precision measurements of antihydrogen and hydrogen
A proton source in the ALPHA apparatus for precision measurements of antihydrogen and hydrogen 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
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Design and performance of a novel low energy multispecies beamline for an antihydrogen experiment
Design and performance of a novel low energy multispecies beamline for an antihydrogen experiment The ALPHA Collaboration, based at the CERN Antiproton Decelerator, has recently implemented a novel beamline for low energy (<100 eV) positron and antiproton transport between cylindrical Penning traps that have strong axial magnetic fields. Here, we describe how a combination of
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Measuring the Properties of Antihydrogen
Measuring the Properties of Antihydrogen This thesis describes the latest results of the on-going efforts to measure the properties of antihydrogen within the ALPHA collaboration. More specifically, it covers the construction and commissioning of the ALPHA-g experiment [1], and the plans to measure how antimatter behaves in Earth’s gravitational field. A special emphasis is on
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Efficient calculations of magnetic fields of solenoids for simulations
Efficient calculations of magnetic fields of solenoids for simulations This paper examines different models for calculating the magnetic field of solenoids. Accuracy and computation time are compared for a range of different simplified models: a current loop and a thin shell solenoid, and solenoids with finite length and thickness. There is no definitive answer to