Category: Publication Content Type
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Cavity and Microwave Experiments on Electron Plasma
Cavity and Microwave Experiments on Electron Plasma A new technique for rapidly generating a sequence of target plasmas in a Penning-Malmberg trap is presented and applied in the first demonstration of cavity-resonant cooling in a plasma. This "reservoir'' technique further enables the in situ magnetic field to be measured to high precision by microwave ECR
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Observation of the 1S–2P Lyman-α transition in antihydrogen
Observation of the 1S–2P Lyman-α transition in antihydrogen In 1906, Theodore Lyman discovered his eponymous series of transitions in the extreme-ultraviolet region of the atomic hydrogen spectrum. The patterns in the hydrogen spectrum helped to establish the emerging theory of quantum mechanics, which we now know governs the world at the atomic scale. Since then,
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Characterization of the 1S–2S transition in antihydrogen
Characterization of the 1S–2S transition in antihydrogen In 1928, Dirac published an equation that combined quantum mechanics and special relativity. Negative-energy solutions to this equation, rather than being unphysical as initially thought, represented a class of hitherto unobserved and unimagined particles—antimatter. The existence of particles of antimatter was confirmed with the discovery of the positron
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Axial to transverse energy mixing dynamics in octupole-based magnetostatic antihydrogen traps
Axial to transverse energy mixing dynamics in octupole-based magnetostatic antihydrogen traps The nature of the trajectories of antihydrogen atoms confined in an octupole minimum-B trap is of great importance for upcoming spectroscopy, cooling, and gravity experiments. Of particular interest is the mixing time between the axial and transverse energies for the antiatoms. Here, using computer
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Machine learning for antihydrogen detection at ALPHA
Machine learning for antihydrogen detection at ALPHA The ALPHA experiment at CERN is designed to produce and trap antihydrogen to the purpose of making a precise comparison with hydrogen. The basic technique consists of driving an antihydrogen resonance which will cause the antiatom to leave the trap and annihilate. The main background to antihydrogen detection
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Methods for plasma stabilization and control to improve antihydrogen production
Methods for plasma stabilization and control to improve antihydrogen production The ALPHA (Antihydrogen Laser Physics Apparatus) collaboration creates and performs precise measurements on antihydrogen to test Charge-Parity-Time (CPT) symmetry. Prior to creating antihydrogen we must prepare the antiproton and positron plasmas to have optimal and repeatable parameters. This thesis presents the development of a new
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Lifetime of magnetically trapped antihydrogen in ALPHA
Lifetime of magnetically trapped antihydrogen in ALPHA How long antihydrogen atoms linger in the ALPHA magnetic trap is an important characteristic of the ALPHA apparatus. The initial trapping experiments in 2010 (Andresen Nature 468, 673–676, 2010) were conducted with 38 detected antiatoms confined for 172 ms and in 2011 (Andresen Nature Phys. 7, 558–564, 2011)
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Observation Of The 1S-2S Transition In Trapped Antihydrogen
Observation Of The 1S-2S Transition In Trapped Antihydrogen Our current understanding of physics suggests that matter and antimatter should be created and destroyed in equal amounts, but this seems inconsistent with the observation that our universe consists almost entirely of matter. Comparisons between matter and antimatter could reveal new physics which explains why the universe
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Prospects for comparison of matter and antimatter gravitation with ALPHA-g
Prospects for comparison of matter and antimatter gravitation with ALPHA-g The ALPHA experiment has recently entered an expansion phase of its experimental programme, driven in part by the expected benefits of conducting experiments in the framework of the new AD + ELENA antiproton facility at CERN. With antihydrogen trapping now a routine operation in the
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Precision measurements on trapped antihydrogen in the ALPHA experiment
Precision measurements on trapped antihydrogen in the ALPHA experiment Both the 1S–2S transition and the ground state hyperfine spectrum have been observed in trapped antihydrogen. The former constitutes the first observation of resonant interaction of light with an anti-atom, and the latter is the first detailed measurement of a spectral feature in antihydrogen. Owing to