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On the non-invariance of space and time scale ranges under Lorentztransformation, and its implications for the study of relativisticinteractions

Description: We present an analysis which shows that the ranges of space and time scales spanned by a system are not invariant under the Lorentz transformation. This implies the existence of a frame of reference which minimizes an aggregate measure of the range of space and time scales. Such a frame is derived for example cases: free electron laser, laser-plasma accelerator, and particle beam interacting with electron clouds. Implications for experimental, theoretical and numerical studies are discussed. Th… more
Date: January 16, 2007
Creator: Vay, J. L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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A new luminescence beam profile monitor for intense proton and heavy ion beams

Description: A new luminescence beam profile monitor is realized in the polarized hydrogen gas jet target at the Relativistic Heavy Ion Collider (RHIC) facility. In addition to the spin polarization of the proton beam being routinely measured by the hydrogen gas jet, the luminescence produced by beam-hydrogen excitation leads to a strong Balmer series lines emission. A selected hydrogen Balmer line is spectrally filtered and imaged to produce the transverse RHIC proton beam shape with unprecedented details … more
Date: October 1, 2008
Creator: Tsang, T.; Bellavia, S.; Connolly, R.; Gassner, D.; Makdisi, Y.; Russo, T. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Particulate matter chemistry and dynamics in the Twilight Zone at VERTIGO ALOHA and K2 Sites

Description: Understanding particle dynamics in the 'Twilight Zone' is critical to prediction of the ocean's carbon cycle. As part of the VERTIGO (VERtical Transformations In the Global Ocean) project, this rarely sampled regime extending from the base of the euphotic layer to 1000 m, was characterized by double-paired day/night Multiple Unit Large Volume in-situ Filtration System (MULVFS) deployments and by {approx}100 high-frequency CTD/transmissometer/turbidity sensor profiles. VERTIGO studies lasting th… more
Date: March 25, 2008
Creator: Bishop, James K.B. & Wood, T.J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Single Particle Beam Dynamics Design of Bsns/Rcs.

Description: Rapid Cycling Synchrotron (RCS) is a key component of Beijing Spallation Neutron Source (BSNS). It accumulates and accelerates protons to design energy of 1.6 GeV, and extracts high energy beam to the target. As a high beam density and high beam power machine, low beam loss is also a basic requirement. An optimal lattice design is essential for the cost and the future operation. The lattice design of BSNS is presented, and the related dynamics issues are discussed. The injection/extraction sche… more
Date: June 23, 2006
Creator: Wang, S.; Fang, S.-X.; Qin, Q.; Tang, J.-Y. & Wei, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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ILC cryogenic systems reference design

Description: A Global Design Effort (GDE) began in 2005 to study a TeV scale electron-positron linear accelerator based on superconducting radio-frequency (RF) technology, called the International Linear Collider (ILC). In early 2007, the design effort culminated in a reference design for the ILC, closely based on the earlier TESLA design. The ILC will consist of two 250 GeV linacs, which provide positron-electron collisions for high energy physics research. The particle beams will be accelerated to their f… more
Date: January 2008
Creator: Peterson, T. J.; Geynisman, M.; Klebaner, A.; Theilacker, J.; Parma, V. & Tavian, L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Engineered and Administrative Safety Systems for the Control of Prompt Radiation Hazards at Accelerator Facilities

Description: The ANSI N43.1 Standard, currently in revision (ANSI 2007), sets forth the requirements for accelerator facilities to provide adequate protection for the workers, the public and the environment from the hazards of ionizing radiation produced during and from accelerator operations. The Standard also recommends good practices that, when followed, provide a level of radiation protection consistent with those established for the accelerator communities. The N43.1 Standard is suitable for all accele… more
Date: December 17, 2007
Creator: Liu, James C.; Vylet, Vashek & Walker, Lawrence S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Application of High-performance Visual Analysis Methods to Laser Wakefield Particle Acceleration Data

Description: Our work combines and extends techniques from high-performance scientific data management and visualization to enable scientific researchers to gain insight from extremely large, complex, time-varying laser wakefield particle accelerator simulation data. We extend histogram-based parallel coordinates for use in visual information display as well as an interface for guiding and performing data mining operations, which are based upon multi-dimensional and temporal thresholding and data subsetting… more
Date: August 28, 2008
Creator: Rubel, Oliver; Prabhat, Mr.; Wu, Kesheng; Childs, Hank; Meredith, Jeremy; Geddes, Cameron G.R. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Three-dimensional Dielectric Photonic Crystal Structures for Laser-driven Acceleration

Description: We present the design and simulation of a three-dimensional photonic crystal waveguide for linear laser-driven acceleration in vacuum. The structure confines a synchronous speed-of-light accelerating mode in both transverse dimensions. We report the properties of this mode, including sustainable gradient and optical-to-beam efficiency. We present a novel method for confining a particle beam using optical fields as focusing elements. This technique, combined with careful structure design, is sho… more
Date: December 14, 2007
Creator: Cowan, Benjamin M. & /Tech-X, Boulder /SLAC
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Closeout Report Department of Energy Grant DE-FG02 95ER40931 Advanced Map Methods for the Description of Particle Beam Dynamics

Description: The above grant was active at Michigan State University from 1994 until 2007. We summarize and document the various activities and key output under the grant, including degrees awarded to graduate students at MSU and through the VUBeam program sponsored by the grant, the books, publications and reports produced, the meetings organized, and the presentations given.
Date: December 17, 2008
Creator: Berz, Martin & Makino, Kyoko
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Inertial Fusion Energy Studies on an Earth Simulator-Class Computer

Description: The U.S. is developing fusion energy based on inertial confinement of the burning fusion fuel, as a complement to the magnetic confinement approach. DOE's Inertial Fusion Energy (IFE) program within the Office of Fusion Energy Sciences (OFES) is coordinated with, and gains leverage from, the much larger Inertial Confinement Fusion program of the National Nuclear Security Administration (NNSA). Advanced plasma and particle beam simulations play a major role in the IFE effort, and the program is … more
Date: August 13, 2002
Creator: Friedman, A & Stephens, R
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Linear Model for Non Isosceles Absorbers.

Description: Previous analyses have assumed that wedge absorbers are triangularly shaped with equal angles for the two faces. In this case, to linear order, the energy loss depends only on the position in the direction of the face tilt, and is independent of the incoming angle. One can instead construct an absorber with entrance and exit faces facing rather general directions. In this case, the energy loss can depend on both the position and the angle of the particle in question. This paper demonstrates tha… more
Date: May 12, 2003
Creator: Berg, J. S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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SPILL STRUCTURE IN INTENSE BEAMS.

Description: Fixed target studies of small branching ratio decay processes require intense beams and smooth spills. Longitudinal structure arises through collective effects, well below the coasting beam stability threshold. These structures have been observed at the Brookhaven AGS and dependence on intensity and momentum spread measured. Measurements and amelioration techniques have been developed and will be described.
Date: May 12, 2003
Creator: GLENN,J. W. BLASKIEWICZ,M. BROWN,K. RAKA,E. RYAN,J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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3 GeV Booster Synchrotron Conceptual Design Report

Description: Synchrotron light cna be produced from a relativistic particle beam circulating in a storage ring at extremely high intensity and brilliance over a large spectral region reaching from the far infrared regime to hard x-rays. The particles, either electrons or positrons, radiate as they are deflected in the fields of the storage ring bending magnets or of magnets specially optimized for the production of synchrotron light. The synchrotron light being very intense and well collimated in the forwar… more
Date: June 2, 2009
Creator: Wiedemann, Helmut
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Designing Neutralized Drift Compression for Focusing of Intense Ion Beam Pulses in a Background Plasma

Description: Neutralized drift compression offers an effective method for particle beam focusing and current amplification. In neutralized drift compression, a linear radial and longitudinal velocity drift is applied to a beam pulse, so that the beam pulse compresses as it drifts in the drift-compression section. The beam intensity can increase more than a factor of 100 in both the radial and longitudinal directions, resulting in more than 10,000 times increase in the beam number density during this process… more
Date: April 28, 2009
Creator: Kaganovich, I. D.; Davidson, R. C.; Dorf, M.; Startsev, E. A.; Barnard, J. J.; Friedman, A. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Application of the Reduction of Scale Range in a Lorentz Boosted Frame to the Numerical Simulation of Particle Acceleration Devices

Description: It has been shown [1] that it may be computationally advantageous to perform computer simulations in a boosted frame for a certain class of systems: particle beams interacting with electron clouds, free electron lasers, and laser-plasma accelerators. However, even if the computer model relies on a covariant set of equations, it was also pointed out that algorithmic difficulties related to discretization errors may have to be overcome in order to take full advantage of the potential speedup [2] … more
Date: May 1, 2009
Creator: Vay, J. L.; Fawley, W. M.; Geddes, C. G. R.; Cormier-Michel, E. & Grote, D. P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Effects of Relativity Lead to"Warp Speed" Computations

Description: A scientist at Lawrence Berkeley National Laboratory has discovered that a previously unnoticed consequence of Einstein's special theory of relativity can lead to speedup of computer calculations by orders of magnitude when applied to the computer modeling of a certain class of physical systems. This new finding offers the possibility of tackling some problems in a much shorter time and with far more precision than was possible before, as well as studying some configurations in every detail for… more
Date: November 1, 2007
Creator: Vay, J. L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Handbook for Gas Filled RF Cavity Aficionados'

Description: The use of hydrogen gas filled RF cavities in muon cooling channels has been proposed by Rolland Johnson. Impressive results have been obtained toward attaining high voltage gradients and rapid training in preliminary tests done at the FNAL MTA facility. However, so far it has not been possible to test them under conditions where they were subject to the transversal of a high intensity particle beam. This note is an attempt to bring together a description of some of the pertinent physical proce… more
Date: May 1, 2009
Creator: Tollestrup, A.V.; Chung, Moses & Yonehara, Katsuya
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Pulsed power and electron beams in the 21st century.

Description: Pulsed power and accelerator technology for high energy density physics, radiography, and simulation has matured to the point that new facilities promise users reliability of quality data return unheard of just a short time ago. By this metric alone these machines and accelerators have graduated from being experiments in their own right, to the solid foundation of a new era of experimental science. The projected performance of a few of these new capabilities will be highlighted, along with some… more
Date: January 1, 2002
Creator: Ekdahl, C. A. (Carl A.)
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Matter in Extreme Conditions Instrument - Conceptual Design Report

Description: The SLAC National Accelerator Laboratory (SLAC), in collaboration with Argonne National Laboratory (ANL), Lawrence Livermore National Laboratory (LLNL), and the University of California at Los Angeles (UCLA), is constructing a Free-Electron Laser (FEL) research facility. The FEL has already met its performance goals in the wavelength range 1.5 nm - 0.15 nm. This facility, the Linac Coherent Light Source (LCLS), utilizes the SLAC 2-Mile Linear Accelerator (linac) and will produce sub-picosecond … more
Date: December 9, 2009
Creator: Boyce, R. F.; Boyce, R. M.; Haller, G.; Hastings, J. B.; Hays, G.; Lee, H. J. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The CMS barrel calorimeter response to particle beams from 2-GeV/c to 350-GeV/c

Description: The response of the CMS barrel calorimeter (electromagnetic plus hadronic) to hadrons, electrons and muons over a wide momentum range from 2 to 350 GeV/c has been measured. To our knowledge, this is the widest range of momenta in which any calorimeter system has been studied. These tests, carried out at the H2 beam-line at CERN, provide a wealth of information, especially at low energies. The analysis of the differences in calorimeter response to charged pions, kaons, protons and antiprotons an… more
Date: January 1, 2009
Creator: Abdullin, S.; /Moscow, ITEP; Abramov, V.; /Serpukhov, IHEP; Acharya, B.; Inst., /Tata et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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The RHIC Hydrogen Jet Luminescence Monitor

Description: A hydrogen jet polarimeter was developed for the RHIC accelerator to improve the process of measuring polarization. Particle beams intersecting with gas molecules can produce light by the process known as luminescence. This light can then be focused, collected, and processed giving important information such as size, position, emittance, motion, and other parameters. The RHIC hydrogen jet polarimeter was modified in 2005 with specialized optics, vacuum windows, light transport, and a new camera… more
Date: June 25, 2007
Creator: Russo, T.; Bellavia, S.; Gassner, D.; Thieberger, P.; Trbojevic, D. & Tsang, T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Absolute Measurement of Electron Cloud Density in a Positively-Charged Particle Beam

Description: Clouds of stray electrons are ubiquitous in particle accelerators and frequently limit the performance of storage rings. Earlier measurements of electron energy distribution and flux to the walls provided only a relative electron cloud density. We have measured electron accumulation using ions expelled by the beam. The ion energy distribution maps the depressed beam potential and gives the dynamic cloud density. Clearing electrode current reveals the static background cloud density, allowing th… more
Date: April 27, 2006
Creator: Kireeff Covo, Michel; Molvik, Arthur W.; Friedman, Alex; Vay, Jean-Luc; Seidl, Peter A.; Logan, Grant et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Measurements of Materials Shielding Properties with 1 GeV/nuc56Fe

Description: The design of future spacecraft such as the Crew ExplorationVehicle must take into account the radiation shielding properties of boththe structural components as well as dedicated shielding materials. Sincemodest depths of shielding stop the vast majority of Solar EnergeticParticles (SEP), the greater challenge is posed by the need to shieldcrew from the Galactic Cosmic Rays (GCR), which include highly-chargedand highly-energetic particles. Here, we report on results from testsperformed with be… more
Date: May 15, 2006
Creator: Zeitlin, Cary; Guetersloh, Stephen B.; Heilbronn, Lawrence H. & Miller, Jack
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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High Power Tests of Normal Conducting Single-Cell Structures

Description: We report the results of the first high power tests of single-cell traveling-wave and standing-wave structures. These tests are part of an experimental and theoretical study of rf breakdown in normal conducting structures at 11.4 GHz. The goal of this study is to determine the gradient potential of normal-conducting rf-powered particle beam accelerators. The test setup consists of reusable mode converters and short test structures and is powered by SLAC's XL-4 klystron. This setup was created f… more
Date: November 7, 2007
Creator: Dolgashev, V. A.; Tantawi, S. G.; Nantista, C. D.; Higashi, Y. & Higo, T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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