69 Matching Results

Search Results

Results: 1 - 24 next
open access

Collapsing Bubble in Metal for High Energy Density Physics Study

Description: This paper presents a new idea to produce matter in the high energy density physics (HEDP) regime in the laboratory using an intense ion beam. A gas bubble created inside a solid metal may collapse by driving it with an intense ion beam. The melted metal will compress the gas bubble and supply extra energy to it. Simulations show that the spherical implosion ratio can be about 5 and at the stagnation point, the maximum density, temperature and pressure inside the gas bubble can go up to nearly … more
Date: April 13, 2011
Creator: Ng, S. F.; Barnard, J. J.; Leung, P. T. & Yu, S. S.
Partner: UNT Libraries Government Documents Department
open access

Toward TW-Level, Hard X-Ray Pulses at LCLS

Description: Coherent diffraction imaging of complex molecules such as proteins requires a large number (e.g., {approx} 10{sup 13}/pulse) of hard X-ray photons within a time scale of {approx} 10 fs or less. This corresponds to a peak power of {approx} 1 TW, much larger than that currently generated by LCLS or other proposed X-ray free electron lasers (FELs). We study the feasibility of producing such pulses using a LCLS-like, low charge electron beam, as will be possible in the LCLS-II upgrade project, empl… more
Date: December 13, 2011
Creator: Fawley, W. M.; Frisch, J.; Huang, Z.; Jiao, Y.; Nuhn, H. D.; Pellegrini, C. et al.
Partner: UNT Libraries Government Documents Department
open access

Proceedings of the 2011 Monitoring Research Review: Ground-Based Nuclear Explosion Monitoring Technologies

Description: These proceedings contain papers prepared for the Monitoring Research Review 2011: Ground-Based Nuclear Explosion Monitoring Technologies, held 13-15 September, 2011 in Tucson, Arizona. These papers represent the combined research related to ground-based nuclear explosion monitoring funded by the National Nuclear Security Administration (NNSA), Defense Threat Reduction Agency (DTRA), Air Force Research Laboratory (AFRL), US Army Space and Missile Defense Command, Comprehensive Nuclear-Test-Ban … more
Date: September 13, 2011
Creator: Wetovsky, Marvin A.; Patterson, Eileen F. & Sandoval, Marisa N.
Partner: UNT Libraries Government Documents Department
open access

Femtosecond X-ray Pulse Temporal Characterization in Free-Electron Lasers Using a Transverse Deflector

Description: We propose a novel method to characterize the temporal duration and shape of femtosecond x-ray pulses in a free-electron laser (FEL) by measuring the time-resolved electron-beam energy loss and energy spread induced by the FEL process, with a transverse radio-frequency deflector located after the undulator. Its merits are simplicity, high resolution, wide diagnostic range, and non-invasive to user operation. When the system is applied to the Linac Coherent Light Source, the first hard x-ray fre… more
Date: December 13, 2011
Creator: Ding, Y.; Behrens, C.; Emma, P.; Frisch, J.; Huang, Z.; Loos, H. et al.
Partner: UNT Libraries Government Documents Department
open access

Estimating High Level Waste Mixing Performance in Hanford Double Shell Tanks

Description: The ability to effectively mix, sample, certify, and deliver consistent batches of high level waste (HLW) feed from the Hanford double shell tanks (DSTs) to the Waste Treatment and Immobilization Plant (WTP) presents a significant mission risk with potential to impact mission length and the quantity of HLW glass produced. The Department of Energy's (DOE's) Tank Operations Contractor (TOC), Washington River Protection Solutions (WRPS) is currently demonstrating mixing, sampling, and batch transf… more
Date: January 13, 2011
Creator: Thien, M. G.; Greer, D. A. & Townson, P.
Partner: UNT Libraries Government Documents Department
open access

A Proposal for Study of Structure and Dynamics of Energy/Matter Based on Production of Gamma-Ray at SLAC Facility

Description: The success of this proposal will open new areas of Chemistry with antimatter: (1) new chemical dynamics; (2) exclusive production of parent ions by energy-tuning the positrons; (3) formation of antimatter compounds; (4) nano- and microscopic imaging of molecules, cells, and tumors (5) multi-positron systems and their thermodynamics and chemical kinetics. Also with o-Ps and p-Ps physics including speculations of dark mater (PAMELA & ATIC reported excesses in the e{sup +}e{sup -} cosmic rays).
Date: December 13, 2011
Creator: Decker, F. -J.; Krasnykh, Anatoly; Perelstein, M. & Shramenko, B.
Partner: UNT Libraries Government Documents Department
open access

Instrument Front-Ends at Fermilab During Run II

Description: The optimization of an accelerator relies on the ability to monitor the behavior of the beam in an intelligent and timely fashion. The use of processor-driven front-ends allowed for the deployment of smart systems in the field for improved data collection and analysis during Run II. This paper describes the implementation of the two main systems used: National Instruments LabVIEW running on PCs, and WindRiver's VxWorks real-time operating system running in a VME crate processor.
Date: July 13, 2011
Creator: Meyer, Thomas; Slimmer, David & Voy, Duane
Partner: UNT Libraries Government Documents Department
open access

NEXT GENERATION MELTER(S) FOR VITRIFICATION OF HANFORD WASTE STATUS AND DIRECTION

Description: Vitrification technology has been selected to treat high-level waste (HLW) at the Hanford Site, the West Valley Demonstration Project and the Savannah River Site (SRS), and low activity waste (LAW) at Hanford. In addition, it may potentially be applied to other defense waste streams such as sodium bearing tank waste or calcine. Joule-heated melters (already in service at SRS) will initially be used at the Hanford Site's Waste Treatment and Immobilization Plant (WTP) to vitrify tank waste fracti… more
Date: January 13, 2011
Creator: WG, RAMSEY; MF, GRAY; RB, CALMUS; JA, EDGE & BG, GARRETT
Partner: UNT Libraries Government Documents Department
open access

Development of an Air Transport Type A Fissile Package

Description: This paper presents the summary of testing by the Savannah River National Laboratory (SRNL) to support development of a light weight (<140 lbs) air transport qualified Type A Fissile Packaging. The package design incorporates features and materials specifically designed to minimize packaging weight. The light weight package is being designed to provide confinement to the contents when subjected to the normal and hypothetical conditions required of an air transportable Type A Fissile radioact… more
Date: July 13, 2011
Creator: Blanton, P. & Ebert, K.
Partner: UNT Libraries Government Documents Department
open access

Thermal Acoustic Sensor for High Pulse Energy X-ray FEL Beams

Description: The pulse energy density of X-ray FELs will saturate or destroy conventional X-ray diagnostics, and the use of large beam attenuation will result in a beam that is dominated by harmonics. We present preliminary results at the LCLS from a pulse energy detector based on the thermal acoustic effect. In this type of detector an X-ray resistant material (boron carbide in this system) intercepts the beam. The pulse heating of the target material produces an acoustic pulse that can be detected with hi… more
Date: December 13, 2011
Creator: Smith, T. J.; Frisch, J. C.; Kraft, E. M.; Loos, J. & Bentsen, G. S.
Partner: UNT Libraries Government Documents Department
open access

Country Review of Energy-Efficiency Financial Incentives in the Residential Sector

Description: A large variety of energy-efficiency policy measures exist. Some are mandatory, some are informative, and some use financial incentives to promote diffusion of efficient equipment. From country to country, financial incentives vary considerably in scope and form, the type of framework used to implement them, and the actors that administer them. They range from rebate programs administered by utilities under an Energy-Efficiency Resource Standards (EERS) regulatory framework (California, USA) to… more
Date: July 13, 2011
Creator: Can, Stephane de la Rue du; Shah, Nihar & Phadke, Amol
Partner: UNT Libraries Government Documents Department
open access

REAL TIME DATA FOR REMEDIATION ACTIVITIES [11505]

Description: Health physicists from the CH2M HILL Plateau Remediation Company collaborated with Berkeley Nucleonics Corporation to modify the SAM 940 isotope identifier instrument to be used for nuclear waste remediation. These modifications coupled with existing capabilities of the SAM 940 have proven to be invaluable during remediation activities, reducing disposal costs by allowing swift remediation of targeted areas that have been identified as having isotopes of concern (IOC), and eliminating multiple … more
Date: January 13, 2011
Creator: CT, BROCK
Partner: UNT Libraries Government Documents Department
open access

Limiting Future Proliferation and Security Risks

Description: A major new technical tool for evaluation of proliferation and security risks has emerged over the past decade as part the activities of the Generation IV International Forum. The tool has been developed by a consensus group from participating countries and organizations and is termed the Proliferation Resistance and Physical Protection (PR&PP) Evaluation Methodology. The methodology defines a set of challenges, analyzes system response to these challenges, and assesses outcomes. The challe… more
Date: March 13, 2011
Creator: Bari, R.
Partner: UNT Libraries Government Documents Department
open access

Momentum Spectrum of Cosmic Muons at a Depth of 320 Mwe

Description: Since their discovery, great progress has been achieved in the field of cosmic ray physics particularly towards the understanding of the origin, transport and acceleration mechanisms of the high energy particles that constitute primary cosmic rays, their interaction processes in the galactic and extra galactic media, and also in the Earth's atmosphere. The interaction of primary cosmic ray particles in the Earth's atmosphere leads to the production of a cascade of secondary particles or Extensi… more
Date: September 13, 2011
Creator: Hashim, N.-O.; /Siegen U. /Heidelberg, Max Planck Inst.; Grupen, C.; U., /Siegen; Luitz, S.; /SLAC et al.
Partner: UNT Libraries Government Documents Department
open access

A Comprehensive Study of Nanometer Resolution of the IPBPM at ATF2

Description: High-resolution beam position monitors (IPBPMs) have been developed in order to measure the electron beam position at the focus point of ATF2 to a few nanometers in the vertical plane. To date, the IPBPM system has operated in test mode with a highest demonstrated resolution of 8.7 nm in the ATF extraction line during 2008. After expected noise source calculations there still remains 7.9 nm of noise of unexplained origin. We summarize the experimental work on the IPBPM system since this measure… more
Date: December 13, 2011
Creator: Kim, Y. I.; Park, H.; U., /Kyungpook Natl.; Boogert, S. T.; /Oxford U., JAI; Frisch, J. et al.
Partner: UNT Libraries Government Documents Department
open access

First Beam to FACET

Description: The SLAC 3km linear electron accelerator has been reconfigured to provide a beam of electrons to the new Facility for Advanced Accelerator Experimental Tests (FACET) while simultaneously providing an electron beam to the Linac Coherent Light Source (LCLS). On June 23, 2011, the first electron beam was transported through this new facility. Commissioning of FACET is in progress. On June 23, 2011, an electron beam was successfully transported through the new FACET system to a dump in Sector 20 in… more
Date: December 13, 2011
Creator: Erickson, R.; Clarke, C.; Colocho, W.; Decker, F. -J.; Hogan, M.; Kalsi, S. et al.
Partner: UNT Libraries Government Documents Department
open access

Gamma-Ray Observations of the Supernova Remnant RX J0852.0-4622 with the Fermi LAT

Description: We report on gamma-ray observations of the supernova remnant (SNR) RX J0852.0-4622 with the Large Area Telescope (LAT) aboard the Fermi Gamma-ray Space Telescope. In the Fermi LAT data, we find a spatially extended source at the location of the SNR. The extension is consistent with the SNR size seen in other wavelengths such as X-rays and TeV gamma rays, leading to the identification of the gamma-ray source with the SNR. The spectrum is well described as a power law with a photon index of {Lamb… more
Date: December 13, 2011
Creator: Tanaka, T.; Allafort, A.; /Stanford U., HEPL /KIPAC, Menlo Park; Ballet, J.; /Saclay; Funk, S. et al.
Partner: UNT Libraries Government Documents Department
open access

An Experimental and Theoretical Multi-Mbar Study of Ti-6Al-4V

Description: We report results from an experimental and theoretical study of the room temperature (RT) compression of the ternary alloy Ti-6Al-4V. In this work, we have extended knowledge of the equation of state (EOS) from 40 GPa to 221 GPa, and observed a different sequence of phase transitions to that reported previously for pure Ti.
Date: April 13, 2011
Creator: Tegner, B. E.; Macleod, S. G.; Cynn, H.; Proctor, J.; Evans, W. J.; McMahon, M. I. et al.
Partner: UNT Libraries Government Documents Department
open access

Beam Dynamics Study of X-Band Linac Driven X-Ray FELS

Description: Several linac driven X-ray Free Electron Lasers (XFELs) are being developed to provide high brightness photon beams with very short, tunable wavelengths. In this paper, three XFEL configurations are proposed that achieve LCLS-like performance using X-band linac drivers. These linacs are more versatile, efficient and compact than ones using S-band or C-band rf technology. For each of the designs, the overall accelerator layout and the shaping of the bunch longitudinal phase space are described b… more
Date: December 13, 2011
Creator: Adolphsen, C.; Limborg-Deprey, C.; Raubenheimer, T. O.; Wu, J. & Sun, Y.
Partner: UNT Libraries Government Documents Department
open access

AVOID BECOMING A VICTIM OF COUNTERFEIT ITEMS

Description: In today's globalized economy, we cannot live without imported products. Most people do not realize how thin the safety net of regulation and inspection really is. Less than three percent of imported products receive any form of government inspection prior to sale. Avoid flea markets, street vendors and deep discount stores. The sellers of counterfeit wares know where to market their products. They look for individuals who are hungry for a brand name item but do not want to pay a brand name pri… more
Date: July 13, 2011
Creator: RD, WARRINER
Partner: UNT Libraries Government Documents Department
open access

MANAGING HANFORD'S LEGACY NO-PATH-FORWARD WASTES TO DISPOSITION

Description: The U.S. Department of Energy (DOE) Richland Operations Office (RL) has adopted the 2015 Vision for Cleanup of the Hanford Site. This vision will protect the Columbia River, reduce the Site footprint, and reduce Site mortgage costs. The CH2M HILL Plateau Remediation Company's (CHPRC) Waste and Fuels Management Project (W&FMP) and their partners support this mission by providing centralized waste management services for the Hanford Site waste generating organizations. At the time of the CHPR… more
Date: January 13, 2011
Creator: LD, WEST
Partner: UNT Libraries Government Documents Department
Back to Top of Screen