Tag: Theses
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Towards Antihydrogen Confinement With The ALPHA Antihydrogen Trap
ALPHA is an international project that has recently begun experimentation at CERN’s Antiproton Decelerator (AD) facility. The primary goal of ALPHA is stable trapping of cold antihydrogen atoms with the ultimate goal of precise spectroscopic comparisons with hydrogen. We discuss the status of the ALPHA project and the prospects for antihydrogen trapping. Go directly to
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A Magnetic Trap for Antihydrogen Confinement
The goal of the ALPHA collaboration at CERN is to test CPT conservation by comparing the 1S–2S transitions of hydrogen and antihydrogen. To reach the ultimate accuracy of 1 part in 1018 , the (anti)atoms must be trapped. Using current technology, only magnetic minimum traps can confine (anti)hydrogen. In this paper, the design of the
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Simple loss scaling laws for quadrupoles and higher-order multipoles used in antihydrogen traps
Simple scaling laws strongly suggest that for antihydrogen relevant parameters, quadrupole magnetic fields will transport particles into, or near to, the trap walls. Consequently quadrupoles are a poor choice for antihydrogen trapping. Higher order multipoles lead to much less transport. Go directly to
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Antihydrogen from merged plasmas – cold enough to trap?
The merging of antiprotons with a positron plasma is the predominant and highest efficient method for cold antihydrogen formation used to date [1, 2, 3]. We present experimental evidence that this method has serious disadvantages for producing antihydrogen cold enough to be trapped [4, 5]. Antihydrogen is neutral but may be trapped in a magnetic
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Greb om antibrint
I efteråret 2002 lykkedes det for første gang forskere at fremstille koldt antistof i form af antibrint-atomer. Nu vil forskerne så forsøge at fange disse antiatomer. Men hvordan fanger man noget, der tilintetgøres så snart det kommer i kontakt med almindeligt stof? Go directly to
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Probing the Antiworld
Half a century since the discovery of the antiproton, and more than 70 years since that of the positron, researchers at CERN can routinely produce millions of antihydrogen atoms. Mike Charlton and Jeffrey Hangst explain how these remarkable anti-atoms could be our best bet for understanding one of the most fundamental symmetries of nature. Go
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Effects of extreme magnetic quadrupole fields on Penning Traps, and the consequences for antihydrogen trapping
Measurements on electrons confined in a Penning trap show that extreme quadrupole fields destroy particle confinement. Much of the particle loss comes from the hitherto unrecognized ballistic transport of particles directly into the wall. The measurements scale to the parameter regime used by ATHENA and ATRAP to create antihydrogen, and suggest that quadrupoles cannot be
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The ALPHA Experiment: A Cold Antihydrogen Trap
The ALPHA experiment aims to trap antihydrogen as the next crucial step towards a precise CPT test, by a spectroscopic comparison of antihydrogen with hydrogen. The experiment will retain the salient techniques developed by the ATHENA collaboration during the previous phase of antihydrogen experiments at the antiproton decelerator (AD) at CERN. The collaboration has identified
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Antihydrogen on tap
Plentiful quantities of antihydrogen, the bound state system of the antiparticles the positron and the antiproton, have recently been made under very controlled conditions in experiments at the European Laboratory of Particle Physics (CERN) near Geneva. In this article I describe how that was done, and why. Go directly to