Category: Publication Content Type
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ALPHA Collaboration gets Antihydrogen in the Trap
ALPHA Collaboration gets Antihydrogen in the Trap The ALPHA collaboration has achieved one of the long-stated goals of the physics programme at CERN’s Antiproton Decelerator: magnetic trapping of antihydrogen atoms. Jeffrey Scott Hangst CERN Courier CERN Courier
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Centrifugal Separation and Equilibration Dynamics in an Electron-Antiproton Plasma
Centrifugal Separation and Equilibration Dynamics in an Electron-Antiproton Plasma Charges in cold, multiple-species, non-neutral plasmas separate radially by mass, forming centrifugally separated states. Here, we report the first detailed measurements of such states in an electron-antiproton plasma, and the first observations of the separation dynamics in any centrifugally separated system. While the observed equilibrium states
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Autoresonant Excitation of Antiproton Plasmas
Autoresonant Excitation of Antiproton Plasmas We demonstrate controllable excitation of the center-of-mass longitudinal motion of a thermal antiproton plasma using a swept-frequency autoresonant drive. When the plasma is cold, dense, and highly collective in nature, we observe that the entire system behaves as a single-particle nonlinear oscillator, as predicted by a recent theory. In contrast,
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Search for trapped antihydrogen in ALPHA
Search for trapped antihydrogen in ALPHA Antihydrogen spectroscopy promises precise tests of the symmetry of matter and antimatter, and can possibly offer new insights into the baryon asymmetry of the universe. Antihydrogen is, however, difficult to synthesize and is produced only in small quantities. The ALPHA collaboration is therefore pursuing a path towards trapping cold
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Search For Trapped Antihydrogen
Search For Trapped Antihydrogen We present the results of an experiment to search for trapped antihydrogen atoms with the ALPHA antihydrogen trap at the CERN Antiproton Decelerator. Sensitive diagnostics of the temperatures, sizes, and densities of the trapped antiproton and positron plasmas have been developed, which in turn permitted development of techniques to precisely and
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Trapped Antihydrogen
Trapped Antihydrogen Antimatter was first predicted in 1931, by Dirac. Work with high-energy antiparticles is now commonplace, and anti-electrons are used regularly in the medical technique of positron emission tomography scanning. Antihydrogen, the bound state of an antiproton and a positron, has been produced at low energies at CERN (the European Organization for Nuclear Research)
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ALPHA Antihydrogen Experiment
ALPHA Antihydrogen Experiment ALPHA is an experiment at CERN, whose ultimate goal is to perform a precise test of CPT symmetry with trapped antihydrogen atoms. After reviewing the motivations, we discuss our recent progress toward the initial goal of stable trapping of antihydrogen, with some emphasis on particle detection techniques. M.C. Fujiwara, G.B. Andresen, M.D.
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Cold antihydrogen: a new frontier in fundamental physics
Cold antihydrogen: a new frontier in fundamental physics The year 2002 heralded a breakthrough in antimatter research when the first low energy antihydrogen atoms were produced. Antimatter has inspired both science and fiction writers for many years, but detailed studies have until now eluded science. Antimatter is notoriously difficult to study as it does not
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Evaporative Cooling Of Antiprotons And Efforts To Trap Antihydrogen
Evaporative Cooling Of Antiprotons And Efforts To Trap Antihydrogen Evaporative cooling has proven to be an invaluable technique in atomic physics, allowing for the study of effects such as Bose-Einstein condensation. One main topic of this thesis is the first application of evaporative cooling to cold non-neutral plasmas stored in an ion trap. We (the
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Evaporative Cooling of Antiprotons to Cryogenic Temperatures
Evaporative Cooling of Antiprotons to Cryogenic Temperatures We report the application of evaporative cooling to clouds of trapped antiprotons, resulting in plasmas with measured temperature as low as 9 K. We have modeled the evaporation process for charged particles using appropriate rate equations. Good agreement between experiment and theory is observed, permitting prediction of cooling