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Development of backlighting sources for a Compton radiography diagnostic of Inertial Confinement Fusion targets

Description: We present scaled demonstrations of backlighter sources, emitting Bremsstrahlung x-rays with photon energies above 75 keV, that we will use to record x-ray Compton radiographic snapshots of cold dense DT fuel in inertial confinement fusion implosions at the National Ignition Facility (NIF). In experiments performed at the Titan laser facility at Lawrence Livermore National Laboratory, we measured the source size and the Bremsstrahlung spectrum as a function of laser intensity and pulse length, … more
Date: May 7, 2008
Creator: Tommasini, R.; MacPhee, A.; Hey, D.; Ma, T.; Chen, C.; Izumi, N. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Radiation shielding for superconducting RF cavity test facility at A0

Description: The results of Monte Carlo radiation shielding study performed with the MARS15 code for the vertical test facility at the A0 north cave enclosure at Fermilab are presented and discussed. The vertical test facility at the A0 north cave is planned to be used for testing 1.3 GHz single-cell superconducting RF cavities with accelerating length of 0.115 m. The operations will be focused on high accelerating gradients--up to 50 MV/m. In such a case the facility can be a strong radiation source [1]. W… more
Date: November 1, 2008
Creator: Dhanaraj, N.; Ginsburg, C.; Rakhno, I. & Wu, G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

CORROSION OF LEAD SHIELDING IN NUCLEAR MATERIALS PACKAGES

Description: Inspection of United States-Department of Energy (US-DOE) model 9975 nuclear materials shipping package revealed corrosion of the lead shielding that was induced by off-gas constituents from organic components in the package. Experiments were performed to determine the corrosion rate of lead when exposed to off-gas or degradation products of these organic materials. The results showed that the room temperature vulcanizing (RTV) sealant was the most corrosive organic species used in the construc… more
Date: July 18, 2008
Creator: Subramanian, K; Kerry Dunn, K & Joseph Murphy, J
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Shielding Calculations for NSLS-II Beamlines.

Description: Brookhaven National Laboratory is in the process of designing a new Electron Synchrotron for scientific research using synchrotron radiation. This facility, called the 'National Synchrotron Light Source II' (NSLS-II), will provide x-ray radiation of ultra-high brightness and exceptional spatial and energy resolution. It will also provide advanced insertion devices, optics, detectors, and robotics, and a suite of scientific instruments designed to maximize the scientific output of the facility. … more
Date: April 13, 2008
Creator: Job,P.K. & Casey, W.R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

14-MeV Neutron Generator Used as a Thermal Neutron Source

Description: One of the most important applications of the general purpose Monte Carlo N-Particle (MCNPS and MCNPX) codes is neutron shielding design. We employed this method to simulate the shield of a 14-MeV neutron generator used as a thermal neutron source providing an external thermal neutron beam for testing large area neutron detectors developed for diffraction studies in biology and also useful for national security applications. Nuclear reactors have been the main sources of neutrons used for scien… more
Date: August 10, 2008
Creator: Dioszegi, I.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Preliminary Benchmarking Efforts and MCNP Simulation Results for Homeland Security

Description: It is shown in this work that basic measurements made from well defined source detector configurations can be readily converted in to benchmark quality results by which Monte Carlo N-Particle (MCNP) input stacks can be validated. Specifically, a recent measurement made in support of national security at the Nevada Test Site (NTS) is described with sufficient detail to be submitted to the American Nuclear Society’s (ANS) Joint Benchmark Committee (JBC) for consideration as a radiation measuremen… more
Date: April 18, 2008
Creator: Hayes, Robert
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Magnetic shielding for the Fermilab Vertical Cavity Test Facility

Description: A superconducting RF cavity has to be shielded from magnetic fields present during cool down below the critical temperature to avoid freezing in the magnetic flux at localized impurities, thereby degrading the cavity intrinsic quality factor Q{sub 0}. The magnetic shielding designed for the Fermilab vertical cavity test facility (VCTF), a facility for CW RF vertical testing of bare ILC 1.3 GHz 9-cell SRF cavities, was recently completed. For the magnetic shielding design, we used two cylindrica… more
Date: September 1, 2008
Creator: Ginsburg, Camille M.; Reid, Clark & Sergatskov, Dmitri A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Guidelines for beamline and front-end radiation shielding design at the Advanced Photon Source.

Description: Shielding for the APS will be such that the individual radiation worker dose will be as low as reasonably achievable (ALARA). The ALARA goals for the APS are to keep the total of the work-related radiation exposure (exposure coming from other than natural or medical sources) as far below 500 person-mrem per year, collective total effective dose equivalent, as reasonably achievable. For an individual APS radiation worker, the goal is to keep the maximum occupational total effective dose equivale… more
Date: September 11, 2008
Creator: Fernandez, P. & Division, X-Ray Science
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Detailed Fission Power 2D-Mapping of AFIP-2 Experiment in ATR CFT Position

Description: The NNSA (National Nuclear Security Administration) RERTR (Reduced Enrichment for Research and Test Reactors) program assigned INL (Idaho National Laboratory) the responsibility of developing and demonstrating high uranium density research reactor fuel forms to enable the use of low enriched uranium (LEU) in the research reactors around the world. A series of full-size fuel plate irradiation tests are proposed for the ATR (Advanced Test Reactor). Labeled the AFIP (ATR Full-size-plates In center… more
Date: May 1, 2008
Creator: Chang, G. S. & Lillo, M. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

High Repetition Rate, LINAC-Based Nuclear Resonance Fluorescence FY 2008 Final Report

Description: This summarizes the first year of a multi-laboratory/university, multi-year effort focusing on high repetition rate, pulsed LINAC-based nuclear resonance fluorescence (NRF) measurements. Specifically, this FY2008 effort centered on experimentally assessing NRF measurements using pulsed linear electron accelerators, operated at various repetition rates, and identifying specific detection requirements to optimize such measurements. Traditionally, interest in NRF as a detection technology, which c… more
Date: December 1, 2008
Creator: Watson, Scott M; Kinlaw, Mathew T; Jones, James L; Hunt, Alan W. & Warren, Glen A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

SHIELDING ANALYSIS FOR X-RAY SOURCES GENERATED IN TARGET CHAMBER OF THE NATIONAL IGNITION FACILITY

Description: Prompt doses from x-rays generated as result of laser beam interaction with target material are calculated at different locations inside the National Ignition Facility (NIF). The maximum dose outside a Target Chamber diagnostic port is {approx} 1 rem for a shot utilizing the 192 laser beams and 1.8 MJ of laser energy. The dose during a single bundle shot (8 laser beams) drops to {approx} 40 mrem. Doses calculated outside the Target Bay doors and inside the Switchyards (except for the 17 ft.-6 i… more
Date: March 27, 2008
Creator: Khater, H Y; Brereton, S J & Singh, M S
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Applicability of a Bonner Shere technique for pulsed neutron in 120 GeV proton facility

Description: The data on neutron spectra and intensity behind shielding are important for radiation safety design of high-energy accelerators since neutrons are capable of penetrating thick shielding and activating materials. Corresponding particle transport codes--that involve physics models of neutron and other particle production, transportation, and interaction--have been developed and used world-wide [1-8]. The results of these codes have been ensured through plenty of comparisons with experimental res… more
Date: February 1, 2008
Creator: Sanami, T.; Hagiwara, M.; Iwase, H.; Iwamoto, Y.; Sakamoto, Y.; Nakashima, H. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Interim Report on Fuel Cycle Neutronics Code Development.

Description: As part of the Global Nuclear Energy Partnership (GNEP), a fast reactor simulation program was launched in April 2007 to develop a suite of modern simulation tools specifically for the analysis and design of sodium cooled fast reactors. The general goal of the new suite of codes is to reduce the uncertainties and biases in the various areas of reactor design activities by enhanced prediction capabilities. Under this fast reactor simulation program, a high-fidelity deterministic neutron transpor… more
Date: May 13, 2008
Creator: Rabiti, C; Smith, M. A.; Kaushik, D. & Yang, W. S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Challenges and concepts for design of an interaction region with push-pull arrangement of detectors - an interface document

Description: Two experimental detectors working in a push-pull mode has been considered for the Interaction Region of the International Linear Collider [1]. The push-pull mode of operation sets specific requirements and challenges for many systems of detector and machine, in particular for the IR magnets, for the cryogenics and alignment system, for beamline shielding, for detector design and overall integration, and so on. These challenges and the identified conceptual solutions discussed in the paper inte… more
Date: June 1, 2008
Creator: Parker, B.; /Brookhaven; Herve, A.; Osborne, J.; /CERN; Mikhailichenko, A. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Preliminary Benchmarking and MCNP Simulation Results for Homeland Security

Description: The purpose of this article is to create Monte Carlo N-Particle (MCNP) input stacks for benchmarked measurements sufficient for future perturbation studies and analysis. The approach was to utilize historical experimental measurements to recreate the empirical spectral results in MCNP, both qualitatively and quantitatively. Results demonstrate that perturbation analysis of benchmarked MCNP spectra can be used to obtain a better understanding of field measurement results which may be of national… more
Date: March 1, 2008
Creator: Hayes, Robert
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

A Basic LEGO Reactor Design for the Provision of Lunar Surface Power

Description: A final design has been established for a basic Lunar Evolutionary Growth-Optimized (LEGO) Reactor using current and near-term technologies. The LEGO Reactor is a modular, fast-fission, heatpipe-cooled, clustered-reactor system for lunar-surface power generation. The reactor is divided into subcritical units that can be safely launched with lunar shipments from Earth, and then emplaced directly into holes drilled into the lunar regolith to form a critical reactor assembly. The regolith would no… more
Date: June 1, 2008
Creator: Bess, John Darrell
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Self Consistent Monte Carlo Method to Study CSR Effects in Bunch Compressors

Description: In this paper we report on the results of a self-consistent calculation of CSR effects on a particle bunch moving through the benchmark Zeuthen bunch compressors. The theoretical framework is based on a 4D Vlasov-Maxwell approach including shielding from the vacuum chamber. We calculate the fields in the lab frame, where time is the independent variable, and evolve the phase space density/points in the beam frame, where arc length, s, along a reference orbit, is the independent variable. Some d… more
Date: January 8, 2008
Creator: Warnock, R. L.; Bassi, G.; Ellison, J. A. & Heinemann, K. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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A dual neutron/gamma source for the Fissmat Inspection for Nuclear Detection (FIND) system.

Description: Shielded special nuclear material (SNM) is very difficult to detect and new technologies are needed to clear alarms and verify the presence of SNM. High-energy photons and neutrons can be used to actively interrogate for heavily shielded SNM, such as highly enriched uranium (HEU), since neutrons can penetrate gamma-ray shielding and gamma-rays can penetrate neutron shielding. Both source particles then induce unique detectable signals from fission. In this LDRD, we explored a new type of interr… more
Date: December 1, 2008
Creator: Doyle, Barney Lee (Sandia National Laboratories, Albuquerque, NM); King, Michael; Rossi, Paolo (Sandia National Laboratories, Albuquerque, NM); McDaniel, Floyd Del (Sandia National Laboratories, Albuquerque, NM); Morse, Daniel Henry; Antolak, Arlyn J. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Evaluation of a Polyvinyl Toluene Neutron Counter Array

Description: The purpose of this article is to simulate the performance of a neutron detector array for empirical configuration optimization and preliminary algorithm evaluation. Utilizing a compact array of borated Polyvinyl Toluene light pipes and Photomultiplier Tubes, pulse shape analysis, standard spectral histogramming, and multiplicity counting can enable neutron measurements for multiple applications. Results demonstrate that analysis with Monte Carlo N-Particle (MCNP) can be used to obtain a better… more
Date: March 1, 2008
Creator: Hayes, Robert
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Construction of a Post-Irradiated Fuel Examination Shielded Enclosure Facility

Description: The U.S. Department of Energy (DOE) has committed to provide funding to the Idaho National Laboratory (INL) for new post-irradiation examination (PIE) equipment in support of advanced fuels development. This equipment will allow researchers at the INL to accurately characterize the behavior of experimental test fuels after they are removed from an experimental reactor also located at the INL. The accurate and detailed characterization of the fuel from the reactor, when used in conjunction with … more
Date: May 1, 2008
Creator: Michael A. Lehto, Ph.D. & Christensen, Boyd D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Capabilities of the INL ZPPR to Support Active Interrogation Research with SNM

Description: For over 40 years Idaho National Laboratory (INL) and its predecessor organizations have maintained and operated the Zero-Power Physics Reactor (ZPPR) as a test bed for studying reactor physics and nuclear reactor design. Although the ZPPR is no longer operated as an active research reactor, it’s infrastructure (radiation shielding, safety systems, physical safeguards) and special nuclear material (SNM) inventory (variably enriched uranium and plutonium fuels available in metallic, oxide, alloy… more
Date: August 1, 2008
Creator: Chichester, David L.; Seabury, Edward H.; Turnage, Jennifer A.; Brush, Bevin A. & Perry, Eugene F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Can Handheld Plastic Detectors Do Both Gamma and Neutron Isotopic Identification with Directional Source Location?

Description: This paper demonstrates, through MCNPX simulations, that a compact hexagonal array of detectors can be utilized to do both gamma isotopic identification (ID) along with neutron identification while simultaneously finding the direction of the source relative to the detector array. The detector array itself is composed of seven borated polyvinyl toluene (PVT) hexagonal light pipes approximately 4 inches long and with a 1.25 inch face-to-face thickness assembled in a tight configuration. The gamma… more
Date: April 18, 2008
Creator: Hayes, Robert
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Shielding analysis and design of the KIPT experimental neutron source facility of Ukraine.

Description: Argonne National Laboratory (ANL) of USA and Kharkov Institute of Physics and Technology (KIPT) of Ukraine have been collaborating on the conceptual design development of an experimental neutron source facility based on the use of an electron accelerator driven subcritical (ADS) facility [1]. The facility uses the existing electron accelerators of KIPT in Ukraine. The neutron source of the sub-critical assembly is generated from the interaction of 100 KW electron beam with a natural uranium tar… more
Date: October 31, 2008
Creator: Zhong, Z.; Gohar, M. Y. A.; Naberezhnev, D. & Duo, J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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