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Comparison of Carbon and Hi-Z Primary Collimators for the LHC Phase II Collimation System

Description: A current issue with the LHC collimation system is single-diffractive, off-energy protons from the primary collimators that pass completely through the secondary collimation system and are absorbed immediately downbeam in the cold magnets of the dispersion suppressor section. Simulations suggest that the high impact rate could result in quenching of these magnets. We have studied replacing the 60 cm primary graphite collimators, which remove halo mainly by inelastic strong interactions, with 5.… more
Date: October 31, 2011
Creator: Keller, Lewis; /SLAC; Markiewicz, Thomas; /SLAC; Smith, Jeffrey; /SLAC et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

CHARACTERIZING DOE HANFORD SITE WASTE ENCAPSULATION STORAGE FACILITY CELLS USING RADBALL

Description: RadBall{trademark} is a novel technology that can locate and quantify unknown radioactive hazards within contaminated areas, hot cells, and gloveboxes. The device consists of a colander-like outer tungsten collimator that houses a radiation-sensitive polymer semi-sphere. The collimator has a number of small holes with tungsten inserts; as a result, specific areas of the polymer are exposed to radiation becoming increasingly more opaque in proportion to the absorbed dose. The polymer semi-sphere… more
Date: March 31, 2011
Creator: Farfan, E. & Coleman, R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Study of Scattered Background Neutron in NIF and Time-of Flight (TOF) to Measure Neutron

Description: Some of the planned core diagnostics for National Ignition Facility (NIF) will use neutron time-of-flight (TOF) spectroscopy techniques to gather information for primary neutron yield measurement or neutron imaging. This technique has been widely and routinely used at other laser facilities including Nova and Omega. TOF methods will also be used to observe target fuel areal density <{rho}R> (radial integral of density) via measuring the number of primary 14.1 MeV neutrons that are down-sc… more
Date: August 31, 2005
Creator: Song, P.; Moran, M.; Phillips, T.; Lerche, R.; Koch, J. & Eder, D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Neutron Radiography and Computed Tomography at Oak Ridge National Laboratory

Description: The capability to perform neutron radiography and computed tomography is being developed at Oak Ridge National Laboratory. The facility will be located at the High Flux Isotope Reactor (HFIR), which has the highest steady state neutron flux of any reactor in the world. The Monte Carlo N-Particle transport code (MCNP), versions 4A and 4B, has been used extensively in the design phase of the facility to predict and optimize the operating characteristics, and to ensure the safety of personnel work… more
Date: December 31, 1997
Creator: Raine, Dudley A. III; Hubbard, Camden R.; Whaley, Paul M.; Wright, Michael C. & Hutchinson, Donald P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

BNCT filter design studies for the ORNL Tower Shielding Facility

Description: Boron Neutron Capture Therapy (BNCT) in the United States has entered into a new phase with the initiation of clinical trials using neutron sources at the Brookhaven National Laboratory and the Massachusetts Institute of Technology. If these trials are successful at demonstrating the efficacy of BNCT as a viable treatment for glioblastoma multiforme, then there will be an immediate demand for several additional neutron sources in order to treat the several thousand patients currently diagnosed … more
Date: December 31, 1996
Creator: Ingersoll, D. T.; Slater, C. O. & Williams, L. R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Source description and sampling techniques in PEREGRINE Monte Carlo calculations of dose distributions for radiation oncology

Description: We outline the techniques used within PEREGRINE, a 3D Monte Carlo code calculation system, to model the photon output from medical accelerators. We discuss the methods used to reduce the phase-space data to a form that is accurately and efficiently sampled.
Date: October 31, 1997
Creator: Schach von Wittenau, A. E.; Cox, L. J.; Bergstrom, P. H., Jr.; Chandler, W. P.; Hartmann-Siantar, C. L. & Hornstein, S. M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Using the MCLIB Library: Small-Angle Instrument with Focusing-Mirror Collimation

Description: Focusing mirrors in 1 or 2 dimensions can be used to increase the intensity in a small-angle instrument while maintaining high resolution. Using the recently added toroidal mirror region type in MCLlB (Monte Carlo library for neutron instrument design), we compare five mirror shares: the ideal ellipsoid the tangent toroid, 8 tangent toroidal segments, 8 tangential cylindrical segments, and 20 tangential cylindrical segments. A small-angle scattering instrument on a spallation source was simulat… more
Date: December 31, 1997
Creator: Seeger, Philip A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

First optics monochromator performance and other HHL optics R&D

Description: To procure a high heat load crystal monochromator system that can deliver the undulator beam to the sample with minimal loss of brilliance with: APS operating at 7 GeV and 100 mA; a 2.5-m ID with k=2.17 (4.2 keV first harmonic). The measured data and modeling indicate that a crystal in the inclined geometry (with appropriate inclination angle) cooled with liquid gallium will meet the needs of this near-term goal. The following should be noted: liquid gallium has been selected as the coolant for… more
Date: December 31, 1994
Creator: Mills, D.M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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