104393622
Results from electron cooling experiments at LEAR
55729922
Experiments on a 14.5 GHz ECR Source
A device for measuring the speed of the wind at medium altitude by the Doppler effect within the visible frequency range comprises a laser which emits pulses of light, a telescope which receives a scattered light and an interferometer used to measure the spectral shift of the scattered light in relation to the emitted pulse of light. The interferometer is a Fabry-Perot interferometer in which a part of one of the two mirrors of the interferometer is covered with an excess thickness of silica to form two separate filters. The spacing of the two mirrors and the excess thickness of silica are determined in such a manner that the pass bands of each one of the two filters thus constructed are centered on the flanks of the spectral distribution of the backscattered light.
119401628
The Electron Cooling Device for LEAR
The experiments1,2,3 in which low energetic protons were cooled by a “cold” electron beam have proved that this method is a very powerful technique to improve low energy beams and to increase their phase space density by several orders of magnitude in short times. The theoretical understanding of the cooling process is well advanced4,5,6. The applications of this technique, which was invented and developed in Novosibirsk, are manifold7. It seems to be clear that its main domain is the cooling of non-relativistic ions. However, also at extremely high energies, cooling of protons and antiprotons with stored electrons (cooled themselves by synchrotron radiation) can be contemplated8,9.
121894301
Studies on ECR4 for the CERN ion program
The CERN heavy ion community, and some other high energy physics experiments, are starting to demand other ions, both heavy and light, in addition to the traditional lead ions. Studies of the behavior of the afterglow for different operation modes of the ECR4 at CERN have been continued to try to understand the differences between pulsed afterglow and continuous operation, and their effect on ion yield and beam reproducibility. The progress in adapting the source and ion beam characteristics to meet the new demands will be presented, as will new information on voltage holding problems in the extraction.
115300845
Status and first beam measurements on the CERN RFQ
102555920
The LHC Lead Ion Injector Chain
119877053
The dimension-5 Lorentz invariant operator system in QCD☆
We analyze the d = 5 operator mixing problem in the α gauge from the standpoint of illustrating various results in formal operator mixing theory. There is one physical gauge-invariant operator and also two unphysical “nuisance” operators. The anomalous dimension eigenvalue of the physical operator is shown to be explicitly gauge invariant; mixing to and between nuisance operators is α dependent and nuisance operators do not mix back to the physical sector. This is, perhaps the simplest system illustrating all of these features. We also discuss Higgs-boson induced d = 5 operators in the nonleptonic weak Hamiltonian.
122935123
Covariant functional Schrödinger formalism and application to the Hawking effect
Abstract We develop a manifestly, generally coordinate-covariant functional Schrodinger formalism. We study the usual problem of Hawking radiation in the Rindler coordinate system. The Hawking effect appears as a shift in the width of the ground-state wave functional relative to a true vacuum state in the low-momentum components. It can be a coherent rather than a thermal effect depending upon the choice of boundary conditions. We analyse the general d + 1 massive solution and discuss its strange features. For example, the d + 1particle number distribution is thermal but not isotropic due to a peculiar energy-momentum dispersion relation. We address a number of other conceptual issues.
126363269
Cross-section for topcolor Z-prime(t) decaying to t anti-t: Version 2.6
111000899
Operational experience and performance of the CDFII silicon detector
The CDFII silicon detector consists of 8 layers of double-sided silicon micro-strip sensors totaling 722,432 readout channels, making it one of the largest silicon detectors in present use by an HEP experiment. After nearly 2 years of data taking, we report on our experience operating the complex device. The performance of the CDFII silicon detector is presented and its effect on physics analyses is discussed. The CDFII silicon detector has begun to show measurable effects of radiation damage. These results and their impact on the expected lifetime of the detector are briefly reviewed.
54867630
Superconducting cosmic strings with massive fermions
Abstract Fermions which couple to the fields comprising a Nielsen-Olesen vortex (cosmic string) can generally exist as massive bound modes on the string. If these fermions carry electromagnetic charge then the string will interact with external electromagnetic fields in a manner significantly altered from the superconducting string scenario of Witten. The current in the string oscillates at a characteristic resonant frequency, ∼ ω , and therefore produces a signature of narrow band radiation. We also give an accounting of the relevant anomalies responsible for fermionic superconducting strings.