... An �atom interferometer� measures accelerations and rotations in much the same way as does a laser-based interferometer, except that the ...

A version of accelerating complex for high energy heavy ions is proposed on the base of a heavy ion collective accelerator. Considerations are presented as to the construction of the complex which is capable of accelerating uranium atoms up to 250 MeV/nuc...

Simulation of low Earth orbit atomic oxygen for accelerated exposure in ground- based facilities is necessary for the durability evaluation of space power ...

Atomic Physics research with beams from accelerators has continued to expand and the number of papers and articles at meetings and in journals reflects a steadily increasing interest and an increasing support from various funding agencies. An attempt will...

The Chalk River Laboratories of Atomic Energy of Canada Ltd. was a major centre for Accelerator based physics for the last fifty years. As early as 1946, nuclear structure studies were started on Cockroft-Walton accelerators. A series of accelerators followed, including the world's ...

We show theoretically that measuring an optimum observable of an electromagnetic wave propagating in an atomic medium moving freely in a gravitational field results in a sensitive detection of the acceleration of gravity and its gradient. The best achievable sensitivity of such a measurement is comparable with that of light-pulse atom ...

A tentative hypothesis, based on the acceleration of solute atom diffusion by deformation-produced vacancies, is proposed to account for the observed ...

An assessment has been performed for an Accelerator Transmutation of Waste (ATW) concept based on the use of the high temperature gas reactor technology. The concept has been proposed by General Atomics for the ATW system. The concept uses recycled light ...

Accelerator-based atomic physics experiments at Brookhaven presently use heavy-ion beams from the Dual MP Tandem Van de Graaff Accelerator Facility for atomic physics experiments of several types. Work is presently in progress to develop experiments which will use the intense photon beams which will be available in ...

We review different ways to accelerate adiabatic processes in cold atom physics and atomic state preparation. Trap expansions or contractions and atomic transport may be accelerated by an invariant-based inverse engineering approach. Berry's inverse engineering method is ...

The theoretical and numerical results on the nonlinear dynamics of an atom in the fields of two counterpropagating radiation beams of different frequencies are presented. Both resonant and nonresonant interaction regimes are investigated. The atom center-of-mass energy dependence on the field amplitudes exhibits the nonlinear threshold effect of reflection ...

The theoretical and numerical results on the nonlinear dynamics of an atom in the fields of two counterpropagating radiation beams of different frequencies are presented. Both resonant and nonresonant interaction regimes are investigated. The atom center-of-mass energy dependence on the field amplitudes exhibits the nonlinear threshold effect of reflection ...

Technological features of nanoprofiling of silicon protected by a solid mask made of porous aluminum oxide are considered. It is shown that the method based on bombarding structures with accelerated neutral atoms (in particular, argon atoms) is efficient for etching through this mask.

Accelerator-Driven Transmutation Technology, or ADT{sup 2}, is a collection of programs that share a common theme - they each have at their heart an intense source of neutrons generated by a high-energy proton beam striking a heavy metal target. The beam energy, typically 1000 MeV, is enough for a single proton to smash a target atom into ...

full potential in space-based applications where micro-gravity will allow the atomic interferometers. To date, ground-based experiments using atomic gravimeters (measuring acceleration) [7,46], gravity gradiometers (measuring acceleration gradients) [11,47] and gyroscopes ...

An assessment has been performed for an Accelerator Transmutation of Waste (ATW) concept based on the use of the high temperature gas reactor technology. The concept has been proposed by General Atomics for the ATW system. The assessment was jointly condu...

The possible application of the stable atomic hydrogen (Harrow-down) in intense polarized atom or ion beam sources is discussed. The proposed scheme is based on flipping the electron spin of stored atoms by microwaves; this results in the magnetic acceleration and focusing of the flipped ...

... the method is not sensitive to vibrations, accelerations, or ... interferometer is the use of atomic samples with ... by the axial trap vibration frequency, and ...

Atomic Physics research with beams from accelerators has continued to expand and the number of papers and articles at meetings and in journals reflects a steadily increasing interest and an increasing support from various funding agencies. An attempt will be made to point out where interdisciplinary benefits have occurred, and where applications of the new ...

An additive scheme for resolving average optical rotatory power of a molecule into atomic contributions, based on the acceleration gauge for the electric dipole, and/or the torque formalism, has been applied to hydrogen peroxide. Extended calculations have been carried out to test the reliability of the partition method. Gross ...

We propose a method by which it is possible to narrow the energy distribution of relativistic protons. The method is based on the conversion of relativistic hydrogen ions into neutral hydrogen atoms, consequent velocity-selective excitation of relativistic hydrogen atoms by the 1S-2P transition, and photoionization of the selectively ...

A method to compensate for Earth�s gravity tide over an extended axial region is reported. Flattening acceleration is important in experiments where the coupling of the dynamics of free-falling probes to the gravity gradient generates stochastic noise on the measurement. Optimized cylindrically symmetric mass distributions lower Earth�s tidal effect over 10 cm by a factor ...

The effects of acceleration on quartz and atomic frequency sources are reviewed. Guidelines are provided for the specification and testing of oscillator acceleration sensitivities. The discussion includes: steady-state acceleration effects, gravity change...

A systematic experimental study on injection of electrons in a gas-jet-based laser wakefield accelerator via ionization of dopant was conducted. The pump-pulse threshold energy for producing a quasi-monoenergetic electron beam was significantly reduced by doping the hydrogen gas jet with argon atoms, resulting in a much better spatial ...

We have searched for long-lived (approx. >10/sup -5/ s) doubly charged negative atomic ions produced in a high-current cesium sputter source with a tandem-accelerator-based charge spectrometer. The results of these ultrasensitive searches for doubly charged negative atomic ions of group VI B and VIII B elements, and hydrogen that ...

A simple method to estimate the atomic degree Hessian matrixof a nanosystem is presented. The estimated Hessian matrix, based on themotif decomposition of the nanosystem, can be used to accelerate abinitio atomic relaxations with speedups of 2 to 4 depending on the sizeof the system. In addition, the programing ...

Atomic Learning is a commercial provider of web-based software training and curriculum resources for K-12 and higher education, business training, and personal use. Resources include thousands of tutorials on most common software applications, including "Lesson Accelerators" for educators, teacher-to-teacher technology training ...

The amorphization of silicon due to atomic displacement during ion implantation has been simulated. A model based on Monte Carlo calculation reproduces very well the depth profile of atomic mixing and displacement length of host silicon atoms reported by previous experiments. The critical displacement in the depth ...

This work reports on the characterisation of a neutron beam shaping assembly (BSA) prototype and on the preliminary modelling of a treatment room for BNCT within the framework of a research programme for the development and construction of an accelerator-based BNCT irradiation facility in Buenos Aires, Argentina. The BSA prototype constructed has been characterised by means of ...

A laser source of neutral atoms for loading the electron rings by ions of elements chosen for acceleration in a collective accelerator has been developed and successfully tested in bench-scale experiments. The source permits to obtain fluxes of atoms of a...

Radiocarbon dating by accelerator mass spectrometry (AMS) differs fundamentally from conventional(14)C dating because it is based on direct determination of the ratio of(14)C:(12)C atoms rather than on counting the radioactivity of(14)C. It is therefore p...

Modern atom counting methods, based on advances in laser and accelerator technology, provide a valuable complement to traditional decay counting methods for radioisotope dating and tracer work. Tandem Accelerator Mass Spectrometry (TAMS) has already had a...

Numerical data bases of atomic and molecular (A and M) data required for laser-induced fusion studies were created. One file contains primarily atomic energy levels and atomic transition data released by Charlotte E. Moore in NBS publications. The second file is based on the spectroscopic ...

Theoretical investigations of plasma-based accelerators and other advanced accelerator concepts. The focus of the work was on the development of plasma based and structure based accelerating concepts, including laser-plasma, plasma channel, and microwave driven plasma ...

The volume presents a program of research initiatives in atomic, molecular, and optical physics. The current state of atomic, molecular, and optical physics in the US is examined with respect to demographics, education patterns, applications, and the US economy. Recommendations are made for each field, with discussions of their histories and the relevance ...

... as on the thickness and atomic species ... shot accelerators that produce beams of accelerated ... stabilization us- ing controllable deceleration voltage. ...

The fourteenth International Conference on the Application of Accelerators in Research and Industry was held in November, 1996 in Texas, USA. The United States Department of Energy was one of the sponsors of this conference. The conference was widely attended by accelerator scientists throughout the world. The topics discussed included a wide range of ...

Research and development activities are summarized in the following areas: Holifield Heavy Ion Research Facility, nuclear physics, the UNISOR program, accelerator-based atomic physics, theoretical physics, nuclear science applications, atomic physics and plasma diagnostics for fusion program, high-energy physics, the nuclear data ...

Absolute gravity measurements are based on the reconstruction of the free-falling motion of a test body in vacuum. In this paper, two large disturbing effects are studied, namely the non-gravitational accelerations originated by rotation and translation of the flying body. Their contribution to the uncertainty of the free-fall ...

The plasma structure in an accelerator with closed electron drifts is investigated experimentally and numerically based on the measured data on the angular and energy ion distribution in a plasma jet. The mathematical model is constructed in a one-dimensional steady-state approximation and is aimed at calculating spatial distributions of the electric ...

Electrons produced as a result of above-threshold ionization of high-Z atoms can be accelerated by currently producible laser pulses up to GeV energies, as shown recently in Hu and Starace, Phys. Rev. Lett. 88 (2002) Article No. 245003. To describe electron acceleration by general focused laser fields, we employ an analytical model ...

... Abstract : High energy nuclear accelerators (atom smashers) have produced some ... They use highly complex instruments which involve precise ...

... Title : IRRADIATION OF SEMIRAD AT THE GENERAL ATOMIC LINEAR ACCELERATOR (LINAC), 5 MAY 1959. Descriptive Note : Technical rept.,. ...

First ever mobile gravity gradient measurement based on Atom Interferometric sensors has been demonstrated. Mobile gravity gradiometers play a significant role in high accuracy inertial navigation systems in order to distinguish inertial acceleration and acceleration due to gravity. The gravity gradiometer consists ...

This source is based on the atomic polarization of the 2/sup 3/S/sub 1/ metastable state of the neutral atom. A version suitable for operation on the high voltage terminal of a CN Van de Graaff has been constructed, bench tested and installed in the terminal of a 7.5 MV machine. The polarization of the atomic beam ...

A sublinear effect in the secondary electron emission from insulating solids under impacts of gold clusters (Au)n, n = 1-5, with energy E = 33-11000 keV/atom has been observed experimentally using the ARAMIS and Tandem accelerators at Orsay. The effect manifests itself in the decrease of the number of emitted electrons per cluster atom ...

An observation of relativistic antihydrogen atoms is reported in this dissertation. Experiment 862 at Fermi National Accelerator Laboratory observed antihydrogen atoms produced by the interaction of a circulating beam of high momentum (3

This document is the annual review of the Argonne National Laboratory Physics Division for the period April 1, 1992--March 31, 1993. Work on the ATLAS device is covered, as well as work on a number of others in lab, as well as collaborative projects. Heavy ion nuclear physics research looked at quasi-elastic, and deep-inelastic reactions, cluster states, superdeformed nuclei, and nuclear shape ...

... ranging from the high-energy accelerators used in atomic physics to the X-ray diffraction systems used to ... ...

The approach used to calculate the two-electron integral by many electronic structure packages including generalized atomic and molecular electronic structure system-UK has been designed for CPU-based compute units. We redesigned the two-electron compute algorithm for acceleration on a graphical processing unit (GPU). We report the ...

The ballistic motion of the exospheric sodium atoms on the surface Mercury is modeled, taking into account the solar radiation pressure acceleration and partial surface thermal accommodation. The Monte Carlo simulations show that there should be a significant degree of limb brightening as well as brightness enhancement over the poles. To maintain the ...

The ballistic motion of the exospheric sodium atoms on the surface Mercury is modeled, taking into account the solar radiation pressure acceleration and partial surface thermal accommodation. The Monte Carlo simulations show that there should be a significant degree of limb brightening as well as brightness enhancement over the poles. To maintain the ...

of experimental control has enabled a quantitative comparison with theory. We consider atomic motionObservation of atomic tunneling from an accelerating optical potential C. F. Bharucha, K. W of cold sodium atoms from an accelerating one-dimensional standing wave of light. ...

We developed a method to determine the pressure distribution in the electrode region of electrostatic accelerators. Direct measurement of this distribution is not possible: the electrodes are maintained inside a high pressure vessel and the presence of vacuum gauges would disturb the beam optics. The method is based on measuring the energy distribution of ...

In an effort to maintain the most flexible environment for accelerator-based atomic physics research at ORNL EN Tandem facility, a recirculating terminal stripper project has been in development. In the early stages of planning for this upgrade, the necessity for monitoring and control of various parameters in the accelerator terminal ...

Advances made in each of the following areas are summarized: (1) long pulse plasma sources, (2) the arc discharge, (3) the atomic species, (4) impurities, (5) accelerator development, (6) beam line components, and (7) the role of positive-ion-based injection systems for reactor-size devices. (MOW)

Abstract. We describe the operation of a light pulse interferometer using cold 87 Rb atoms in reduced gravity. Using a series of two Raman transitions induced by light pulses, we have obtained Ramsey fringes in the low gravity environment achieved during parabolic flights. With our compact apparatus, we have operated in a regime which is not accessible on ground. In the much ...

A concept for an accelerator complex for efficiently producing high-quality radioactive beams at Coulomb barrier energies and higher will be presented. A high-power driver accelerator would be used to produce radionuclides in a target that is closely coupled to an ion source and mass separator, i.e. an Isotope-Separator-On-Line (ISOL) system. A challenge ...

Non-invasive Laser-driven Atomic-probe-beam Diagnostic (LAD) based on the resonance laser excitation of an atomic probe beam with a density of 10^12-1013 cm-3 can be applied to investigate high power ion beam diodes and other pulsed power devices. A variant of the LAD has been developed to study the accelerating ...

Non-invasive Laser-driven Atomic-probe-beam Diagnostic (LAD) based on the resonance laser excitation of an atomic probe beam with a density of 10^12-10^13 cm-3 can be applied to investigate high power ion beam diodes and other pulsed power devices. A variant of the LAD has been developed to study the accelerating ...

We report the observation of Quantum Accelerator Modes (QAM) for cold Rb-87 atoms. Quantum accelerator modes are produced by the diffraction of atomic De Broglie waves. When a standing light wave which acts as a thin phase grating is produced, a group of atoms that have certain initial velocity ...

The Superconducting Supercollider (SSC) will require an 87-kilometer accelerator ring to boost particles to 40 TeV. The SSC's size is due in part to the fact that its operating principle is the same one that has dominated accelerator design for 50 years: it guides particles by means of magnetic fields and propels them by strong electric fields. If ...

... ACCELERATION TOLERANCE, COMPUTER PROGRAMS, DATA BASES, MATHEMATICAL MODELS, STATISTICAL INFERENCE, LOADS ...

Tables for acceleration terminology equivalents based on human and vehicle angular and linear motion

Several methods for imaging using accelerated heavy ion beams are being investigated at Lawrence Berkeley Laboratory. Using the HILAC (Heavy-Ion Linear Accelerator) as an injector, the Bevalac can accelerate fully stripped atomic nuclei from carbon (Z = 6...

Limits on the long-term stability and accuracy of a second generation cold atom gravimeter are investigated. We demonstrate a measurement protocol based on four interleaved measurement configurations, which allows rejection of most of the systematic effects, but not those related to Coriolis acceleration and wave-front distortions. ...

Antihydrogen is the simplest atomic system composed entirely of antiparticles. Analogous to hydrogen, antihydrogen contains a positron and an antiproton. The creation and storage of antihydrogen is a challenge that combines the technologies of ion trapping (nested Penning traps to accumulate and mix the positrons and antiprotons) and atom trapping (a ...

Energy distributions of N atoms in a hollow-cathode planar sputtering magnetron were obtained by use of optical emission spectroscopy. A characteristic line, N I 8216.3 �, well-separated from molecular nitrogen emission bands, was identified. Jansson's nonlinear spectral deconvolution method, refined by minimization of {chi}_w ² , was ...

We report progress made during the period 15 September 1991--14 September 1992 on the project Experimental Investigations of Electron Capture from Atomic Hydrogen and Deuterium by Alpha Particles''. In the past year we have developed reliable, narrow energy spread, high-current sources of He[sup ++] based on direct-current magentron and ...

We propose to use the charge exchange reaction of antiprotons with positronium atoms in order to produce antihydrogen atoms, H-bar, and H-bar{sup +} ions. The ions can be cooled down to {mu}K temperatures and then ionized to recover an ultra slow neutral H-bar atom. Its acceleration is then measured by time of ...

The purpose of this note is to provide initial assessments of some atomic physics effects for the accelerator section of NDCX-II. There are several effects we address: the production of electrons associated with loss of beam ions to the walls, the production of electrons associated with ionization of background gas, the possibly resultant production of ...

The long-lived isotope 53Mn cosmogenically produced in situ is a very useful indicator for geochronological dating. A new 53Mn accelerator-mass-spectrometry (AMS) measurement method is developed based on the HI-13 Tandem Accelerator and ?E-Q3D detection system at China Institute of Atomic Energy. The performance of ...

We develop an algorithm for generating better initial electronic wave function estimates for density functional theory calculations following atomic movement. First principles molecular dynamics and atomic relaxation calculations involve successive movements of atoms followed by self consistent field (SCF) solutions for electronic wave ...

We explore the utility and feasibility of neutral beams of greater than or equal to 6 AMU formed from negative ions, and also of D/sup 0/ formed from D/sup -/. The negative ions would be accelerated to approx. 1 to 2 MeV/AMU and neutralized, whereupon the neutral atoms would be used to heat and, perhaps, to drive current in magnetically confined plasmas. ...

In the dissociation reaction of O2 on the Si(001)-c(4�2) surface, a trapping-mediated reaction is accelerated by external tensile stress. This alteration of the reactivity is more than an order of magnitude greater than estimations based on the alteration of the electronic structure caused by strain of the surface lattice. It was found that on the ...

. The reverse effect, namely the acceleration of an atom approaching an antinode, is much smaller, as here.............................................................. Cavity cooling of a single atom P ...

Atomic clocks of the future: using the ultrafast and ultrastable' Leo Hollberg, Scott Diddanis based on laser cooled and trapped atoms. In contrast to today's atomic clocks that are based on electronic oscillators locked to microwave transitions in atoms, the nest ...

We discuss radiation damage to a transmutation system driven by a proton accelerator. The transmuter is composed of a lead target, beam window, structural wall, subcritical core, and reflector. Because of its subcritical condition, neutrons are supplied by the spallation reaction generated by high-energy protons. The spallation neutrons, as well as the fission neutrons, cause ...

The problem of screening of the charge acquired by a dust grain in a two-temperature plasma is considered. The influence of the trapped ions on the screening effect and on the frictional force exerted on a dust grain by an ion flow is investigated. It is shown that the ions trapped by a grain radically reduce the frictional force in the ion flow because their distribution is determined by the ...

In this work, the performance of an accelerator-based neutron source design has been compared with that of a modern fluoride-filtered reactor-based epithermal beam having near-optimal quality for treatment of deep seated tumors in relation to its applicability for BNCT. The accelerator is a Tandem-Electrostatic-Quadrupole (TESQ) ...

... Magnetic Analysis of a Beam of Positive Ions, Accelerated by a Voltage of 5-30 kv, After ... argon or krypton atom, or a hydrogen or nitrogen molecule. ...

The major emphasis of our experimental nuclear physics research is in Heavy-Ion Physics, centered at the recently completed ATLAS facility. ATLAS is a designated National User Facility and is based on superconducting radio-frequency technology developed in the Physics Division. In addition, the Division has strong programs in Medium-Energy Physics and in Weak-Interaction ...