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Free-electron laser generation of VUV and x-ray radiation using a conditioned beam and ion-channel focusing

Description: The use of ion-focusing and a conditioned beam greatly enhances FEL gain in the VUV and Soft X-Ray range. The equations governing FEL amplification are derived and results of a linear analysis are noted. Numerical results, including 3D effects and having an order of magnitude improvement in gain, are presented for a 30 {Angstrom} example. 3 refs., 2 figs., 1 tab.
Date: August 30, 1991
Creator: Yu, Li-Hua (Brookhaven National Lab., Upton, NY (United States)); Sessler, A. & Whittum, D.H. (Lawrence Berkeley Lab., CA (United States))
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Nuclear structure at intermediate energies

Description: The theme that unites the sometimes seemingly disparate experiments undertaken by the Bonner Lab Medium Energy Group is a determination to understand in detail the many facets and manifestations of the strong interaction, that which is now referred to as nonperturbative QCD. Whether we are investigating the question of just what does carry the spin of baryons, or the extent of the validity of the SU(6) wavefunctions for the excited hyperons (as will be measured in their radiative decays in our … more
Date: September 30, 1991
Creator: Bonner, B. E. & Mutchler, G. S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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MARITIME GAS-COOLED REACTOR PROGRAM QUARTERLY PROGRESS REPORT FOR PERIOD ENDING, SEPTEMBER 30, 1960

Description: The feasibility was studied and a cost estimate prepared of an experimental reactor to determine the operating characteristics of beryllia- moderated, gas-cooled systems wtthin a power limit of 10 Mw(t). The heat energy produced by the experimental reactor is to be dissipated in a heat dump. No machinery for production of power was to be provided. Other requirements were that the reactor should be capable of testing core types different from the current MGCR design, and the system should permit… more
Date: September 30, 1960
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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3D field harmonics

Description: We have developed an harmonic representation for the three dimensional field components within the windings of accelerator magnets. The form by which the field is presented is suitable for interfacing with other codes that make use of the 3D field components (particle tracking and stability). The field components can be calculated with high precision and reduced cup time at any location (r,{theta},z) inside the magnet bore. The same conductor geometry which is used to simulate line currents is … more
Date: March 30, 1991
Creator: Caspi, S.; Helm, M. & Laslett, L.J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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A 3 TeV on 3 TeV proton-proton dedicated collider for Fermilab

Description: The Fermilab Dedicated Collider proposed in May 1983 is a 2 TeV on 2 TeV p)bar p) collider. The expected luminosity is )approximately) 10/sup 31/ cm/sup (minus/2)sec/sup )minus/1) and the estimated cost is )approximately) $362M (FY-83 dollars). Since 1983 both the superconducting magnet and the particle detector technologies have advanced and the countenance of physics, hence the desired characteristics of new facilities have also altered somewhat. We want to show here that with the new magnet … more
Date: March 30, 1988
Creator: Teng, L.C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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5cm aperture dipole studies

Description: The results obtained during the evolution of the design, construction, and testing program of the design ''B'' dipole are presented here. Design ''B'' is one of the original three competing designs for the Superconducting Super Collider ''SSC'' arc dipoles. The final design parameters were as follows: air cored (less than a few percent of the magnetic field derived from any iron present), aluminum collared, two layered winding, 5.5T maximum operating field, and a 5 cm cold aperture. There have … more
Date: September 30, 1986
Creator: McInturff, A.D.; Bossert, R.; Carson, J.; Fisk, H.E.; Hanft, R.; Kuchnir, M. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Theoretical and experimental studies of elementary physics

Description: The experimental high energy physics program is directed toward the execution of experiments that probe the basic constituents of matter and the forces between them. These experiments are carried out at national and international accelerator facilities. At the current time, we are primarily concentrating on the following projects: Direct photon production in hadronic reactions (Fermilab E706); Production of hybrid mesons in the nuclear Coulomb field; The D-Zero experiment at the Tevatron collid… more
Date: April 30, 1992
Creator: Bodek, A.; Ferbel, T.; Melissinos, A. C.; Olsen, S.; Slattery, P.; Tipton, P. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Piping instability resulting from bellows misalignment

Description: The failure of the single phase bellows and magnet test stand during quench testing of SSC dipole magnet DD0011 has led to much speculation about the inherent stability of operating SSC magnets. This note addresses the problem of instabilities resulting from both translational and angular misalignment between pipes connected by bellows in the general sense and with respect to the SSC single phase system specifically. Note that none of the instabilities referenced here result from bellows 'squir… more
Date: May 30, 1989
Creator: Nicol, T.H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The Advanced Light Source: A new 1. 5 GeV synchrotron radiation facility at the Lawrence Berkeley Laboratory

Description: The Advanced Light Source (ALS), now under construction at the Lawrence Berkeley Laboratory, is being planned as a national user facility for the production of high-brightness and partially coherent x-ray and ultraviolet synchrotron radiation. The ALS is based on a low-emittance electron storage ring optimized for operation at 1.5 GeV with insertion devices in 11 long straight sections and up to 48 bend-magnet ports. High-brightness photon beams, from less than 10 eV to more than 1 keV, will be… more
Date: June 30, 1989
Creator: Schlachter, A.S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Discovery of A Very Bright, Strongly-Lensed z=2 Galaxy in the SDSS DR5

Description: We report on the discovery of a very bright z = 2.00 star-forming galaxy that is strongly lensed by a foreground z = 0.422 luminous red galaxy (LRG). This system was found in a systematic search for bright arcs lensed by LRGs and brightest cluster galaxies in the Sloan Digital Sky Survey Data Release 5 sample. Follow-up observations on the Subaru 8.2m telescope on Mauna Kea and the Astrophysical Research Consortium 3.5m telescope at Apache Point Observatory confirmed the lensing nature of this … more
Date: September 30, 2008
Creator: Lin, Huan; Buckley-Geer, Elizabeth; Allam, Sahar S.; Tucker, Douglas L.; Diehl, H.Thomas; Kubik, Donna et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Target design optimization for an electron accelerator driven subcritical facility with circular and square beam profiles.

Description: A subcritical facility driven by an electron accelerator is planned at the Kharkov Institute of Physics and Technology (KIPT) in Ukraine for medical isotope production, materials research, training, and education. The conceptual design of the facility is being pursued through collaborations between ANL and KIPT. As part of the design effort, the high-fidelity analyses of various target options are performed with formulations to reflect the realistic configuration and the three dimensional geome… more
Date: October 30, 2008
Creator: Gohar, M. Y. A; Sofu, T.; Zhong, Z.; Belch, H.; Naberezhnev, D. & Division, Nuclear Engineering
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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CP Violation in Hadronic Penguins at BABAR

Description: The authors present preliminary measurements of time-dependent CP-violation parameters in the decay B{sup 0} {yields} {omega}K{sub S}{sup 0}, B{sup 0} {yields} {eta}{prime}K{sup 0}, B{sup 0} {yields} {pi}{sup 0}K{sub S}{sup 0}, B{sup 0} {yields} {phi}K{sub S}{sup 0}{pi}{sup 0}, and B{sup 0} {yields} K{sup +}K{sup -}K{sub S}{sup 0}, which includes the resonant final states {phi}K{sub S}{sup 0} and f{sub 0}(980)K{sub S}{sup 0}. The data sample corresponds to the full BABAR dataset of 467 x 10{sup… more
Date: October 30, 2008
Creator: Hirschauer, J. & Collaboration, for the BABAR
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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International scoping study: accelerator working group report

Description: During the past several years, an International Scoping Study (ISS) of a Neutrino Factory was carried out, with the aim of developing an internationally accepted baseline facility design. Progress toward that goal will be described. Many of the key technical aspects of a Neutrino Factory facility design are presently being investigated experimentally, and the status of these investigations will be mentioned. Plans for the recently launched International Design Study (IDS), which serves as a fol… more
Date: September 30, 2006
Creator: Zisman, M. S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Progress Report No. 62 June 1-15, 1948

Description: This paper reports on the following programs: (1) 184-inch Cyclotron Program; (2) 60-inch Cyclotron Program; (3) Synchrotron Program; (4) Linear Accelerator Program; (5) Experimental Physics; (6) Theoretical Physics; (7) Isotope Separation Program; (8) Chemistry; and (9) Medical Physics.
Date: June 30, 1948
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Spectroscopic Studies of Structure, Dynamics and Reactivity in Ionic Liquids.

Description: Ionic liquids (ILs) are a rapidly expanding family of condensed-phase media with important applications in energy production, nuclear fuel and waste processing, improving the efficiency and safety of industrial chemical processes, and pollution prevention. ILs are generally nonvolatile, noncombustible, highly conductive, recyclable and capable of dissolving a wide variety of materials. They are finding new uses in chemical synthesis, catalysis, separations chemistry, electrochemistry and other … more
Date: November 30, 2007
Creator: Wishart, J. F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Extensive Set of Low-Fidelity Covariances in Fast Neutron Region.

Description: An extensive set of covariances for neutron cross sections has been developed to provide initial, low-fidelity but consistent uncertainty data for nuclear criticality safety applications. The methodology for the determination of such covariances in fast neutron region is presented. It combines the nuclear reaction code EMPIRE, which calculates sensitivity to nuclear reaction model parameters and the Bayesian code KALMAN to propagate uncertainty of the model parameters onto cross sections. Takin… more
Date: July 30, 2007
Creator: Pigni, M. T.; Herman, M.; Oblozinsky, P. & Rochman, D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Generation of attosecond x-ray pulses with a multi-cycle two-color ESASE scheme

Description: Generation of attosecond x-ray pulses is attracting much attention within the x-ray free-electron laser (FEL) user community. Several schemes have been proposed based on manipulations of electron bunches with extremely short laser pulses. In this paper, we extend the attosecond two-color ESASE scheme proposed by Zholents et al. to the long optical cycle regime using a detuned second laser and a tapered undulator. Both lasers can be about ten-optical-cycles long, with the second laser frequency … more
Date: September 30, 2008
Creator: Ding, Y.; Huang, Z.; Ratner, D.; Bucksbaum, P. & Merdji, H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Searches for the Decays B0 to l+- tau-+ and B+ to l+ nu(L=e,mu) using Hadronic Tag Reconstruction

Description: We present searches for the leptonic decays B{sup +} {yields} {ell}{sup +}{nu} and the lepton flavor violating decays B{sup 0} {yields} {ell}{sup {+-}}{tau}{sup {-+}}, where {ell} = e, {mu}, with data collected by the BABAR experiment at SLAC. This search demonstrates a novel technique in which we fully reconstruct the accompanying {bar B} in {Upsilon}(4S) {yields} B{bar B} events, and look for a monoenergetic lepton from the signal B decay. The signal yield is extracted from a fit to the signa… more
Date: January 30, 2008
Creator: Aubert, Bernard; Bona, M.; Karyotakis, Y.; Lees, J. P.; Poireau, V.; Prudent, X. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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APS Science 2007.

Description: This report provides research highlights from the Advanced Photon Source (APS). Although these highlights represent less than 10% of the published work from the APS in 2007, they give a flavor of the diversity and impact of user research at the facility. In the strategic planning the aim is to foster the growth of existing user communities and foresee new areas of research. This coming year finds the APS engaged in putting together, along with the users, a blueprint for the next five years, and… more
Date: May 30, 2008
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Active RF Pulse Compression using Electrically Controlled Semiconductor Switches

Description: In this paper, we will present our recent results on the research of the ultra-fast high power RF switches based on silicon. We have developed a switch module at X-band which can use a silicon window as the switch. The switching is realized by generation of carriers in the bulk silicon. The carriers can be generated electrically or/and optically. The electrically controlled switches use PIN diodes to inject carrier. We have built the PIN diode switches at X-band, with <300ns switching time. … more
Date: January 30, 2008
Creator: Guo, J. & Tantawi, S. G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Nuclear Reaction Data from Surrogate Measurements: A Consideration of (n,f) Cross Sections

Description: A brief summary of the Surrogate reaction method, an indirect approach for determining compound-nuclear reaction cross sections, is presented. The possibilities for obtaining accurate (n,f) cross sections from Surrogate measurements that are analyzed in the Weisskopf-Ewing and Ratio approximations are considered. Theoretical studies and benchmark experiments that provide new insights into the validity and limitations of the Surrogate approach, are discussed.
Date: July 30, 2007
Creator: Escher, J E; Bernstein, L A; Burke, J T; Dietrich, F S & Lyles, B F
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Algebraic Sub-Structuring for Electromagnetic Applications

Description: Algebraic sub-structuring refers to the process of applying matrix reordering and partitioning algorithms to divide a large sparse matrix into smaller submatrices from which a subset of spectral components are extracted and combined to form approximate solutions to the original problem. In this paper, they show that algebraic sub-structuring can be effectively used to solve generalized eigenvalue problems arising from the finite element analysis of an accelerator structure.
Date: June 30, 2006
Creator: Yang, C.; Gao, W.G.; Bai, Z.J.; Li, X.Y.S.; Lee, L.Q.; Husbands, P. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Progress on the Flash X-Ray Optical Transition Radiation Diagnostic

Description: This document summarizes the Flash X-Ray accelerator (FXR) optical transition radiation (OTR) spot-size diagnostics efforts in FY07. During this year, new analysis, simulation, and experimental approaches were utilized to interpret OTR spot data from both dielectric foils such as Kapton (VN type) and metal coated foils. Significant new findings of the intricacies involved in the diagnostic and of FXR operational issues were achieved. Geometry and temperature based effects were found to affect t… more
Date: March 30, 2008
Creator: Tang, V; Houck, T & Brown, C
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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SASE FEL Polarization Control Using Crossed Undulator

Description: There is a growing interest in producing intense, coherent x-ray radiation with an adjustable and arbitrary polarization state. In this paper, we study the crossed undulator scheme for rapid polarization control in a self-amplified spontaneous emission (SASE) free electron laser (FEL). Because a SASE source is a temporally chaotic light, we perform a statistical analysis on the state of polarization using FEL theory and simulations. We show that by adding a small phase shifter and a short (abou… more
Date: September 30, 2008
Creator: Ding, Yuantao & Huang, Zhirong
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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