Quantum cylindrical quadrupole (Total 276471 Papers Found)

[1] We present a reconstruction of global sea level (GSL) since 1700 calculated from tide gauge records and analyse the evolution of global sea level acceleration during the past 300 years. We provide observational evidence that sea level acceleration up to the present has been about 0.01 mm/yr and appears to have started at the end of the 18th century. Sea level rose by 6 cm during the 19th century and 19 cm in the 20th century. Superimposed on the long-term acceleration are quasiperiodic fluct ...
In this paper, we investigate reducing the power consumption of a synchronous digital system by minimizing the total power consumed by the clock signals. We construct activity-driven clock trees wherein sections of the clock tree are turned off by gating the clock signals. Since gating the clock signal implies that additional control signals and gates are needed, there exists a tradeoff between the amount of clock tree gating and the total power consumption of the clock tree. We exploit similari ...
Helioseismology, the study of global solar oscillations, has proved to be an extremely powerful tool for the investigation of the internal structure and dynamics of the Sun. Studies of time changes in frequency observations of solar oscillations from helioseismology experiments on Earth and in space have shown, for example, that the Sun’s shape varies over solar cycle timescales. In particular, far-reaching inferences about the Sun have been obtained by applying inversion techniques to observa ...
We apply the recently defined multipole vector framework to the frequency-specific first-yearWMAP sky maps, estimating the low-l multipole coefficients from the high-latitude sky by means of a power equalization filter. While most previous analyses of this type have considered only heavily processed (and foreground-contaminated) full-sky maps, the present approach allows for greater control of residual foregrounds, and therefore potentially also for cosmologically important conclusions. The low- ...
The PEP-N project is a proposed new e+ecollider at SLAC to operate in the center of mass energy range of 1.0 GeV to 3.1 GeV. PEP-N consists of a new Very Low Energy electron Ring VLER (<800 MeV) to collide with the PEP-II e+ Low Energy Ring LER (3.1 GeV) parasitically to PEP-II operation for BaBar. Since the e+ ring has a fixed energy, the very low energy ring needs an energy range of 100 MeV to 800 MeV. This collider would likely be placed in Experimental Hall 12 of the PEP-II complex and ha ...
An extended pairing plus QQ force model, which has been shown to successfully explain the nuclear binding energy and related quantities such as the symmetry energy, is applied to study the alpha-like four-nucleon correlations in 1f7/2 shell nuclei. The double difference of binding energies, which displays a characteristic behavior at N ≈ Z, is interpreted in terms of the alpha-like correlations. Important roles of proton-neutron interactions forming the alpha-like correlated structure are disc ...
Dipole excitations in neutron-rich nuclei below the neutron threshold are investigated. The method is based on Hartree-Fock-Bogoliubov (HFB) and Quasiparticle-Phonon Model (QPM) theory. Of our special interest are the properties of the low-lying 1 Pygmy Resonance and the two-phonon quadrupole-octupole 1 states in Sn-isotopes including exploratory investigations for the experimentally unknown mass regions. In particular we investigate the evolution of the dipole strength function with the neutron ...
SIS100 Substantial progress in reduction of AC losses has been achieved with new model dipole and quadrupole magnets [1,2]. Compared with the original Nuclotron the experimental obtained losses in the new designed 4K test dipole (yoke at liquid helium temperatures) were reduced from 53 W to 24 W (standard cycle 2T, 4T/s, 1Hz). The measured AC losses in the 50K yoke quadrupole and improved 4K yoke quadrupole were 7 W and 15.6 W respectively, i.e. about the factor of 5 and 2.2 less compared to the ...
Background An extensive search through the Protein Databank (about 4500 nonredundant structures) was previously completed within our lab to analyze the energetic and geometric characteristics of an understudied molecular interaction known as an anion-quadrupole (AQ) interaction. Such an interaction occurs when the positively charged edge of an aromatic ring, resulting from a quadruple moment (i.e., a dual dipole moment), renders the aromatic molecule noncovalently bound to a nearby anionic molec ...
The electron beam of the European XFEL will be accelerated to an energy up to 17 GeV in a linear accelerator that is divided into 101 modules. Each module will be equipped with eight superconducting cavities and a superconducting magnet package. That package consists of a main superferric quadrupole and two nested corrector dipoles, horizontal and vertical, enclosed in a stainless steel vessel. Conduction-cooled current leads are used. Up to four prototypes were produced between 2005 and 2009. S ...
As part of the US-LHC Accelerator Project, Fermilab is producing fully cryostated assemblies that will be installed as the Q1, Q2 and Q3 optical elements for the LHC Inner Triplets. The main quadrupole magnets in the Q1 (LQXA) and Q3 (LQXC) assemblies are MQXA elements designed and fabricated by KEK and Toshiba, while those in the Q2 (LQXB) assemblies are MQXB quadrupoles designed and fabricated by Fermilab. The cryostat assemblies for all magnets are designed by Fermilab, and final assembly of ...
The kinetic theories of the electric and magnetic Senftleben-Beenakker effects and of non­ resonant absorption in polar symmetric top gases are reviewed, using an expansion of the distribu­ tion function-density m atrix which includes the dipole moment operator juQ . General expressions are given for the elastic parts of all collision integrals coupling two purely angular momentum de­ pendent tensors. This is done for a variety of nonspherical potentials, including the dipole-dipole (DD), dip ...
Two Panofsky quadrupoles with rectangular aperture and fast rise time are proposed for the injection area in the University of Maryland electron ring project (UMER) [1,2,3]. The theoretical current distribution needed on the surface of a rectangular aperture to produce a quadrupole field is derived [4]. The conductor location is determined mostly by the theoretical current distribution, with some free factors to optimise the field. The design is based on the linearity of longitudinal integrated ...
A statistical variation-perturbation method is used in the derivation of multipole polarizabilities from Hartree-Fock electron densities. A quantum correction of the kinetic energy expressions takes into account the exponential decrease of the electron density in the outer part of the atom. The method is called semiempirical because of the still unsolved problem of the kinetic energy in the statistical theory of the atom. The results are compared to the best available experimental and theoretica ...
A booster synchrotron has been recently commissioned at Duke University FEL Laboratory as a part of the High Intensity Gamma-ray Source (HIGS) facility. The booster provides top-off injection into the storage ring in the energy range of 0.24-1.2 GeV. In order to minimize the cost of the project, the booster is designed with a very compact footprint. As a result, unconventionally high field bending magnets at 1.76 T are required. A main ramping power supply drives all dipoles and quadrupoles. Qua ...
Using numerical simulations, we investigate the large-scale gravitational clustering in a flat universe dominated by cold plus hot dark matter (i.e., Ω 0 = Ω CDM +Ω HDM +Ω baryon = 1). Primordial density fluctuation spectrum is taken to have the Zel'dovich-Harrison form. Three models are studied, with Model I having Ω CDM = 0.69, Ω baryon = 0.01, and Ω HDM = 0.30 in one flavor of neutrinos; Model II having Ω CDM = 0.60, Ω baryon = 0.10, and Ω HDM = 0.30 in one flavor of neutr ...
We investigate a possible connection between the suppression of the power at low multipoles in the CMB spectrum and the late time acceleration. We show that, assuming a cosmic IR/UV duality between the UV cutoff and a global infrared cutoff given by the size of the future event horizon, the equation of state of the dark energy can be related to the apparent cutoff in the CMB spectrum. The present limits on the equation of state of dark energy are shown to imply an IR cutoff in the CMB multipole ...
The magnetization of single crystals of FeCrzS4 has been measured between 4 OK and Tc = 195 OK with the field in the [100],, [110] and [Ill] directions. [loo] is the easy axis of magnetization, [Ill] is very hard. At 4 OK the st~ffness In the [loo] dlrectton corresponds to K1 = 3 x 106 erg.cm-3. 57Fe Mossbauer spectra of FeCrzS4 has been obtained at 77 and 4 OK. A non axial quadrupole splitting is observed at 4 OK. A uniaxial quadrupole splittinng is found in C ~ I ~ F ~ S ; C ~ ~ S ~ (x = 0.02) ...
Large quadrupole splittings (Q.S.) are observed in Co doped specimen, compared with other transition metal doped specimens while isomer shifts (I.S.) do not show large value. Since Q.S. is associated with the electric field gradient at nucleus of iron atom; we calculate the potential at nucleus site, assuming the interaction between LA-phonon-conduction electron. Through the calculations, it is found that electric field gradient increase with the number of phonons attached to a conduction electr ...
We review Maxwell’s multipole vectors, and elucidate some of their mathematical properties, with emphasis on the application of this tool to the cosmic microwave background (CMB). In particular, for a completely random function on the sphere (corresponding to the statistically isotropic Gaussian model of the CMB), we derive the full probability density function of the multipole vectors. This function is used to analyze the internal configurations of the WMAP3 quadrupole and octopole, and we sh ...
Spectral intensities of quadrupolar nuclei and the radiofrequency (rf) pulse lengths for selective and non-selective excitation of any single-quantum NMR transition in the solid state are calculated. When nuclei of the same element occupy sites which experience different electric field gradients, the spectra are quantitatively reliable only when the length of the rf pulse is much smaller than n/Z~,,Jl(lf 1 ) m( m + I ). By using hydrated samples and short rf pulses, quantitative determination of ...
A clinical synchrotron facility designed by GSI for cancer therapy using energetic proton and ion beams (C, He and O) is under construction and will be installed at the university hospital in Heidelberg, Germany, starting in 2005. The status of the ECR ion source systems, the beam line components, the 400 keV/u RFQ and the 20 MV IH cavity as well as the linac RF system is reported. The production of most of the components is in progress. First devices have been delivered to GSI already. The RF c ...
We have developed the superconducting final-focus quadrupoles for SuperKEKB, the next generation B-factory experiment in Japan. The system consists of four quadrupole doublets for incoming and outgoing electron and positron beams, respectively. A R&D superconducting quadrupole magnet was fabricated. In this paper, we describe the results on the excitation test and the magnetic field measurements of this R&D magnet. ...
Various kinds of devices, such as lasers and musical instruments, utilize stationary-wave oscillations in resonant cavities. In order to maintain stationary oscillation in these devices, nonlinearity is essential in the mechanism for balancing the pumping of the external energy and the decay of the wave of the quasistable state in the resonant cavity. Besides, the interaction between nonlinearities and the morphology of the boundary condition imposed on a resonating wave system by the shape of t ...
R. Winkler,* A. Gade, T. Baugher, D. Bazin, B. A. Brown, T. Glasmacher, G. F. Grinyer, R. Meharchand,* S. McDaniel, A. Ratkiewicz, and D. Weisshaar National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA (Received 27 February 2012; published 30 April 2012) ...
We have investigated complete scar mode structures of a quadrupole-shape microcavity made of liquid jet both theoretically and experimentally. We observed five different transverse scar modes with different Q factors but with surprisingly similar emission directionality due to the presence of very low-Q scar modes in the vicinity of the observed high-Q scar modes in phase space. Asymmetrical microcavities can serve as a versatile cavity for generating highly directional emission as well as a use ...
The swimming trajectories of self-propelled organisms or synthetic devices in a viscous fluid can be altered by hydrodynamic interactions with nearby boundaries. We explore a multipole description of swimming bodies and provide a general framework for studying the fluid-mediated modifications to swimming trajectories. A general axisymmetric swimmer is described as a linear combination of fundamental solutions to the Stokes equations: a Stokeslet dipole, a source dipole, a Stokeslet quadrupole, a ...
For calculations involving the deuteron S state wave function it is common to use the asymptotic form for a rough approximation and the ad hoc Hulthen form for a better estimate. The two parameters of the Hulthen function are determined by the deuteron binding energy and the singlet effective range. In like manner we propose an ad hoc analytic form for the D state wave function, which contains two parameters which are determined by the deuteron quadrupole moment and D state percentage. The resul ...
Totsche KU (2015) Structure and composition of Fe-OM co-precipitates that form in soil-derived solutions, Geochimica et Cosmochimica Acta, 169, pp. 167-183. Abstract Iron oxides represent a substantial fraction of secondary minerals and particularly affect the reactive properties of natural systems in which they formed, e.g. in soils and sediments. Yet, it is still obscure how transient conditions in the solution will affect the properties of in situ precipitated Fe oxides. Transient composition ...
The magnetic phase diagram for antiferro-quadrupole (AFQ) ordering in tetragonal HoB2C2 has been investigated by measurements of elastic constants C11, C44 and C66 in fields along the basal x-y plane as well as the principal [001]-axis. The hybrid magnet (GAMA) in Tsukuba Magnetic Laboratory was employed for high field measurements up to 30 T. The AFQ phase is no longer observed above 26.3 T along the principal [001] axis in contrast to the relatively small critical field of 3.9 T in fields appl ...
We have performed experiments that explore the e®ects of a magnetic quadrupole ̄eld on a pure electron plasma con ̄ned in a Malmberg-Penning trap. We have developed a model which describes the shape of the plasma and shows that a certain class of resonant electrons follows trajectories that take them out of the plasma. Even though the quadrupole ̄eld destroys the cylindrical symmetry of the system, the theory predicts that if the electrons are o® resonance, the lifetime of the plasma is n ...
The various technologies available to build a SASE-type undulator for a 1As wavelength are compared. This includes permanent magnets, superconducting and room-temperature electromagnets for both the planar and helical-"eld con"gurations. Following a 3D computation of the magnetic "eld, general expressions are given for the peak "eld as a function of the undulator period. The growth length and saturated length of the SASE radiation is computed by means of the simple analytical expressions of the ...
Obtaining UV/Vis absorption spectra of cations is a challenging endeavor due to the low densities that can be achieved in the gas phase. In matrix isolation, ions of interest are accumulated in a cold inert matrix of a rare gas (e.g. Argon, Neon) until sufficient concentrations are attained for direct spectroscopic characterization . Nonetheless, in order to ensure neutralization of the matrix, experimentalists often rely on non-ideal, energetic processes, such as electron emission from metal su ...
Multipole expansions depend on the coordinate system, so that coefficients of multipole moments can be set equal to zero by an appropriate choice of coordinates. Therefore, it is meaningless to say that a physical system has a nonvanishing quadrupole moment, say, without specifying which coordinate system is used. (Except if this moment is the lowest non-vanishing one.) This result is demonstrated for the case of two equal like electric charges. Specifically, an adapted coordinate system in whic ...
A rapid onset of quadrupole deformation is known to occur around the neutron number 60 in the neutron-rich Zr and Sr isotopes. This shape change has made the neutron-rich A = 100 region an active area of experimental and theoretical studies for many decades now. We report in this contribution new experimental results in the neutron rich 96,98Sr investigated by safe Coulomb excitation of radioactive beams at the REX-ISOLDE facility, CERN. Reduced transition probabilities and spectroscopic quadrup ...
A one-dimensional harmonic oscillator in a box is used to introduce the oblique-basis concept. The method is extended to the nuclear shell model by combining traditional spherical states, which yield a diagonal representation of the usual single-particle interaction, with collective configurations that track deformation. An application to 24Mg, using the realistic two-body interaction of Wildenthal, is used to explore the validity of this mixed-mode shell-model scheme. Specifically, the correct ...
A rapid onset of quadrupole deformation is known to occur around the neutron number 60 in the neutron-rich Zr and Sr isotopes. This shape change has made the neutronrich A = 100 region an active area of experimental and theoretical studies for many decades now. We report in this contribution new experimental results in the neutron rich 96,98Sr investigated by safe Coulomb excitation of radioactive beams at the REX-ISOLDE facility, CERN. Reduced transition probabilities and spectroscopic quadrupo ...
Three versions of hybrid quadrupoles 2a<sub>0</sub>=15mm in aperture with shunting elements made of soft magnetic material (SMM) are analyzed. It is shown that Version 1 allows for gradient variation in the range of G=40-90 T/m and the regulation of magnetic center at G<sub>max</sub> during the rotation of external ring with shunting inserts. Authors have also analyzed the possibility to regulate the position of quadrupole magnetic axis by rotating additional rods made of ...
The Electron-Light Ion Collider ELIC proposed by Jefferson Lab aims at a luminosity in the 10<sup>35</sup>cm<sup>-2</sup>sec<sup>-1</sup>range for collisions of 150 GeV protons on 7 GeV electrons [1, 2]. To achieve these high luminosities, very strong low-β focusing of low-emittance beams is required. Taking advantage of the unequal design proton beam emittances in the two transverse planes, an interaction region design based on superconducting quadrupole ...