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Electron Cooling Simulation for Arbitrary Distribution of Electrons
Electron Cooling Simulation for Arbitrary Distribution of Electrons

... proposed to use so called “hollow” electron beam – the beam with small density in the central part. The “hollow” electron beam is efficient for ion beam storage using cooling-stacking procedure. The low electron density in the stack region avoids overcooling of the stack and decreases (for heavy ion ...
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Resonant ionization of shallow donors in electric field Linköping University Post Print
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... over a distance much larger than the size of an atom. However, when the particles in question are moving fast enough, this approximation turns out to be quite accurate—in some cases extremely so. This is in part due to the probabilistic nature of quantum mechanics, a topic treated in depth in Unit 5 ...
Transition probabilities and dynamic structure factor in the ASEP
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... one considers realizations of the process for a duration T which for a long interval between large times t and T − t (where T − t is itself also large) have carried an atypically large flux. This extreme event quite surprisingly makes the conditioned process intrinsically related to a much simpler s ...
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Quantum electrodynamics



In particle physics, quantum electrodynamics (QED) is the relativistic quantum field theory of electrodynamics. In essence, it describes how light and matter interact and is the first theory where full agreement between quantum mechanics and special relativity is achieved. QED mathematically describes all phenomena involving electrically charged particles interacting by means of exchange of photons and represents the quantum counterpart of classical electromagnetism giving a complete account of matter and light interaction.In technical terms, QED can be described as a perturbation theory of the electromagnetic quantum vacuum. Richard Feynman called it ""the jewel of physics"" for its extremely accurate predictions of quantities like the anomalous magnetic moment of the electron and the Lamb shift of the energy levels of hydrogen.
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