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Estimates of post-acceleration longitudinal bunch compression

Description: A simple analytic method is developed, based on physical approximations, for treating transient implosive longitudinal compression of bunches of heavy ions in an accelerator system for ignition of inertial-confinement fusion pellet targets. Parametric dependences of attainable compressions and of beam path lengths and times during compression are indicated for ramped pulsed-gap lines, rf systems in storage and accumulator rings, and composite systems, including sections of free drift. It appear… more
Date: November 25, 1977
Creator: Judd, D.L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Luminosity evolution at the SSC

Description: A realistic'' model for the time evolution of the SSC luminosity is given. The SDC instrumentation and physics strategy should be informed by this profile. 1 ref.
Date: September 25, 1991
Creator: Kirk, T.B.W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Field-independent normalization of SSC Collider Ring costs

Description: The SSC Collider Ring represents the dominating cost element of the SSC project. The number of variables involved in optimizing the facility is very large so it is helpful to try to parameterize them in a way that allows a straightforward comparison of primary options. Cost information has been drawn from the Reference Designs Study supplemented by data from studies carried out by the Harza Engineering Company in Illinois. Various studies indicate that a 9' to 10' tunnel seems optimal from a co… more
Date: March 25, 1985
Creator: Toohig, T.E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Technical Challenges and Scientific Payoffs of Muon BeamAccelerators for Particle Physics

Description: Historically, progress in particle physics has largely beendetermined by development of more capable particle accelerators. Thistrend continues today with the recent advent of high-luminosityelectron-positron colliders at KEK and SLAC operating as "B factories,"the imminent commissioning of the Large Hadron Collider at CERN, and theworldwide development effort toward the International Linear Collider.Looking to the future, one of the most promising approaches is thedevelopment of muon-beam acce… more
Date: September 25, 2007
Creator: Zisman, Michael S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Physics possibilities at LHC/SSC

Description: This document reviews some recent work on physics simulations for SSC/LHC. Included are reviews of some of the recent developments in physics simulations for the SSC/LHC and comments upon the requirements that are placed upon detectors by the need to extract specific physics signatures. The material in the various EOI/LOI documents submitted to the SCC Laboratory and the work done at the Aachen LHC workshop are discussed. In the following discussion 1 SSC (LHC) year corresponds to an integrated… more
Date: April 25, 1991
Creator: Hinchliffe, I.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Soudan 2 as a long baseline neutrino detector

Description: In a nine month run with a 150 GeV proton beam and a conventional double horn neutrino beam aimed at the Soudan 2 detector, a search could be made for neutrino oscillations in the mode /nu//sub /mu// /yields/ /nu//sub /tau//. If evidence for oscillations is not found, new limits could be set extending the /Delta/m/sup 2/ excluded region from .3 eV/sup 2/ to .004 eV/sup 2/ at 90% confidence level. 7 refs., 4 figs.
Date: May 25, 1989
Creator: Goodman, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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An expression of interest in a Super Fixed Target Beauty Facility (SFT) at the Superconducting Super Collider

Description: The concept of a Super Fixed Target Beauty Facility (SFT) which uses a relatively low intensity 20 TeV proton beam as a generator of very high momenta B's is an exciting prospect which is very competitive with other B factory ideas. The yields of B's in such a facility are quite high (3 {times} 10{sup 10} {yields} 10{sup 11} B's per year). At this level of statistics, CP violation measurements will be possible in many modes. In addition, the fixed target configuration, because of the high momen… more
Date: May 25, 1990
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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EMPACT: Electrons Muons Partons with Air Core Toroids

Description: The EMPACT experiment utilizes a broad approach to maximize its discovery potential for new phenomena accessible at the SSC. The high resolution detector has a balances emphasis on, and large acceptance for, electrons, muons, jets, and noninteracting particles, and is capable of utilizing the ultimate luminosity of the SSC. The detector emphasizes excellent calorimetry augmented by TRD tracking, and employs an innovative system of superconducting air core toroids for muon measurements. Signific… more
Date: May 25, 1990
Creator: Marx, M. D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Study of the effect of the space charge using SYNCH

Description: The interparticle repulsion, or space charge, limits the density of charged-particle beams that can be obtained in storage rings. In this report the authors study the effect of increasing the space charge, with an exact computation of the lattice parameters using SYNCH. Systematically increasing the ion density by decreasing the emittance with cooling techniques lowers the betatron tune, until the lower half-integral stopband resonance -- also induced by the beam -- is reached. In the simple mo… more
Date: April 25, 1994
Creator: Haffmans, A. F.; Maletic, D. & Ruggiero, A. G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Progress in Studies of Electron-Cloud-Induced Optics Distortions at CesrTA

Description: The Cornell Electron Storage Ring Test Accelerator (CesrTA) program has included extensive measurements of coherent betatron tune shifts for a variety of electron and positron beam energies, bunch population levels, and bunch train configurations. The tune shifts have been shown to result primarily from the interaction of the beam with the space-charge field of the beam-induced low-energy electron cloud in the vacuum chamber. Comparison to several advanced electron cloud simulation codes has al… more
Date: June 25, 2012
Creator: Crittenden, James; /Cornell U., CLASSE; Calvey, Joseph; /Cornell U., CLASSE; Dugan, Gerald; /Cornell U., CLASSE et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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GPU COMPUTING FOR PARTICLE TRACKING

Description: This is a feasibility study of using a modern Graphics Processing Unit (GPU) to parallelize the accelerator particle tracking code. To demonstrate the massive parallelization features provided by GPU computing, a simplified TracyGPU program is developed for dynamic aperture calculation. Performances, issues, and challenges from introducing GPU are also discussed. General purpose Computation on Graphics Processing Units (GPGPU) bring massive parallel computing capabilities to numerical calculati… more
Date: March 25, 2011
Creator: Nishimura, Hiroshi; Song, Kai; Muriki, Krishna; Sun, Changchun; James, Susan & Qin, Yong
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Explicit Formulas for 2nd-Order Driving Terms Due to Sextupoles and Chromatic Effects of Quadrupoles.

Description: Optimization of nonlinear driving terms have become a useful tool for designing storage rings, especially modern light sources where the strong nonlinearity is dominated by the large chromatic effects of quadrupoles and strong sextupoles for chromaticity control. The Lie algebraic method is well known for computing such driving terms. However, it appears that there was a lack of explicit formulas in the public domain for such computation, resulting in uncertainty and/or inconsistency in widely … more
Date: April 25, 2012
Creator: Wang, C-X. (Accelerator Systems Division (APS))
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Ground Movement in SSRL Ring

Description: Users of the Stanford Synchrotron Radiation Lightsource (SSRL) are being affected by diurnal motion of the synchrotron's storage ring, which undergoes structural changes due to outdoor temperature fluctuations. In order to minimize the effects of diurnal temperature fluctuations, especially on the vertical motion of the ring floor, scientists at SSRL tried three approaches: painting the storage ring white, covering the asphalt in the middle of the ring with highly reflective Mylar and installin… more
Date: August 25, 2011
Creator: Sunikumar, Nikita & /SLAC, /UCLA
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Collective Effects in the NSLS-II Storage Ring.

Description: A new high-brightness synchrotron light source (NSLS-II) is under design at BNL. The 3-GeV NSLS-II storage ring has a double-bend achromatic lattice with damping wigglers installed in zero-dispersion straights to reduce the emittance below 1nm. In this paper, we present an overview of the impact of collective effects upon the performance of the storage ring. Subjects discussed include instability thresholds, Touschek lifetime and intra-beam scattering.
Date: June 25, 2007
Creator: Krinsky, S.; Bengtsson, J.; Berg, J. S.; Blaskiewicz, M.; Blednykh, A.; Guo, W. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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A Search for the Decays B^+ to e^+\nu_e and B^+ to \mu^+\nu_\mu Using Hadronic-tag Reconstruction

Description: The authors report on a search for the rare decay modes B{sup +} {yields} e{sup +}{nu}{sub e} and B{sup +} {yields} {mu}{sup +}{nu}{sub {mu}} with data collected from the BABAR detector at the PEP-II e{sup +}e{sup -} storage ring. This search utilizes a new technique in which they fully reconstruct the accompanying B{sup -} in {Upsilon}(4S) {yields} B{sup +}B{sup -} events, and look for a mono-energetic lepton in B{sup +} rest frame. No signal candidates observed in either of the channels, cons… more
Date: September 25, 2006
Creator: Klemetti, M
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Preliminary Impedance Budget for Nsls-Ii Storage Ring.

Description: The wakefield and impedance produced by the components of the NSLS-II storage ring have been computed for an electron bunch length of 3mm rms. The results are summarized in a table giving for each component, the loss factor ({kappa}{sub {parallel}}), the imaginary part of the longitudinal impedance at low frequency divided by the revolution harmonic (ImZ{sub {parallel}}/n), and the transverse kick factors ({kappa}{sub x}, {kappa}{sub y}).
Date: June 25, 2007
Creator: Blednykh, A. & Krinsky, S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Coupling Impedance of Cesr-B Rf Cavity for the Nsls-Ii Storage Ring.

Description: CESR-B type superconducting cavities are under consideration for acceleration of the electron beam in the 3GeV NSLS-II storage ring. In this paper we present detailed investigation of longitudinal and transverse impedance of CESR-B cavity and transitions. Ferrite material is included in impedance analysis. Its effect on short range wake potential has been studied using GdfidL code. The summary results of loss factors and kick factors are presented for a 3mm rms bunch length.
Date: June 25, 2007
Creator: Blednykh, A.; Krinsky, S. & Rose, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Philosophy for Nsls-Ii Design With Sub-Nanometer Horizontal Emittance.

Description: NSLS-II at Brookhaven National Laboratory is a new third-generation storage ring light source, whose construction is on the verge of being approved by DOE. When completed, NSLS-II with its ability to provide users with a wide range of spectrum, ranging from IR to ultra-high brightness hard x-ray beams will replace the existing two (20+ years old) NSLS light sources. While presenting an overview of the NSLS-II accelerator system, this paper focuses on the strategy and development of a novel <… more
Date: June 25, 2007
Creator: Ozaki, S.; Bengtsson, J.; Kramer, S. l.; Krinsky, S. & Litvinenko, V. N.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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TOUSCHEK LIFETIME CALCULATIONS AND SIMULATIONS FOR NSLS-II

Description: The beam lifetime in most medium energy synchrotron radiation sources is limited by the Touschek effect, which describes the momentum transfer from the transverse into the longitudinal direction due to binary collisions between electrons. While an analytical formula exists to calculate the resulting lifetime, the actual momentum acceptance necessary to perform this calculation can only be determined by tracking. This is especially the case in the presence of small vertical apertures at insertio… more
Date: June 25, 2007
Creator: Montag, C.; Bengtsson, J. & Nash, B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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DESIGN OF BEAM TRANSFER LINES FOR THE NSLS II

Description: The NSLS-II light source which is a proposed facility to be built at Brookhaven National Laboratory utilizes two synchrotron accelerator rings: the booster and the Storage ring (SR). Designing the NSLS-11 injector we considered two options for the booster layout, where the rings either (a) share the same tunnel, but placed at different horizontal planes or (b) booster is located in a separate building. The booster which accepts beam from the linac, accelerates the electron beam to an energy of … more
Date: June 25, 2007
Creator: Tsoupas, N.; Rose, J.; Pinayev, I.; Shaftan, T. & Stelmach, C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Pep-X Impedance and Instability Calculations

Description: PEP-X, a next generation, ring-based light source is designed to run with beams of high current and low emittance. Important parameters are: energy 4.5 GeV, circumference 2.2 km, beam current 1.5 A, and horizontal and vertical emittances, 185 pm by 8 pm. In such a machine it is important that impedance driven instabilities not degrade the beam quality. In this report they study the strength of the impedance and its effects in PEP-X. For the present, lacking a detailed knowledge of the vacuum ch… more
Date: August 25, 2010
Creator: Bane, K. L. F.; Lee, L. -Q.; Ng, C.; Stupakov, G.; au Wang, L. & Xiao, L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Optimal Model-Based Fault Estimation and Correction for Particle Accelerators and Industrial Plants Using Combined Support Vector Machines and First Principles Models

Description: Timely estimation of deviations from optimal performance in complex systems and the ability to identify corrective measures in response to the estimated parameter deviations has been the subject of extensive research over the past four decades. The implications in terms of lost revenue from costly industrial processes, operation of large-scale public works projects and the volume of the published literature on this topic clearly indicates the significance of the problem. Applications range from… more
Date: August 25, 2010
Creator: Sayyar-Rodsari, Bijan; Schweiger, Carl & /SLAC /Pavilion Technologies, Inc., Austin, TX
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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