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Muon shielding calculations: heterogeneous passive and active shields, applications to experimental beams and areas

Description: With the advent of a new generation of high-energy and high-intensity proton accelerators such as the one being built at the National Accelerator Laboratory and the one proposed by CERN, the problem of shielding external proton targets, the secondary beams produced from these targets, and even the secondary targets in the experimental areas becomes quite a massive and expensive project. In addition to the massive hadron shielding required, the high-energy muons produced by the decay of pions an… more
Date: January 1, 1971
Creator: Theriot, D.; Awschalom, M. & Lee, K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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An evaluation of costs for constructing high density concrete shields at 105-K

Description: The primary purpose of this report is to present cost data associated with the recent construction of biological shields at Hanford. These data are useful for analyzing shields which have been built during the past four years and for ascertaining ways to improve future designs. Specifically, the objectives of this study are to: compile and analyze cost data associated with the construction of the high density concrete shields at 105-K and the steel-masonite shields at 105-C; and determine unit … more
Date: November 7, 1955
Creator: Davis, H. S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Heat-shield design for glovebox applications.

Description: Heat shields can often be used in place of insulation materials as an effective means of insulating glovebox furnace vessels. If used properly, shields can accomplish two important objectives: thermal insulation of the vessel to maintain a desired process temperature and protection of the glovebox, equipment, and user. A heat-shield assembly can be described as an arrangement of thin, properly-spaced, metal sheets that reduce radiation heat transfer. The main problem encountered in the design o… more
Date: July 10, 1998
Creator: Frigo, A. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Structural Design and Thermal Analysis for Thermal Shields of the MICE Coupling Magnets

Description: A superconducting coupling magnet made from copper matrix NbTi conductors operating at 4 K will be used in the Muon Ionization Cooling Experiment (MICE) to produce up to 2.6 T on the magnet centerline to keep the muon beam within the thin RF cavity indows. The coupling magnet is to be cooled by two cryocoolers with a total cooling capacity of 3 W at 4.2 K. In order to keep a certain operating temperature margin, the most important is to reduce the heat leakage imposed on cold surfaces of coil c… more
Date: July 1, 2009
Creator: Green, Michael A.; Pan, Heng; Liu, X. K.; Wang, Li; Wu, Hong; Chen, A. B. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Summary of Disposable Debris Shields (DDS) Analysis for Development of Solid Debris Collection at NIF

Description: Collection of solid debris from the National Ignition Facility (NIF) is being developed both as a diagnostic tool and as a means for measuring nuclear reaction cross sections relevant to the Stockpile Stewardship Program and nuclear astrophysics. The concept is straightforward; following a NIF shot, the debris that is produced as a result of the capsule and hohlraum explosion would be collected and subsequently extracted from the chamber. The number of nuclear activations that occurred in the c… more
Date: November 20, 2011
Creator: Shaughnessy, D A; Moody, K J; Grant, P M; Lewis, L A; Hutcheon, I D; Lindvall, R et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Progress on Establishing Guidelines for National Ignition Facility (NIF) Experiments to Extend Debris Shield Lifetime

Description: The survivability and performance of the debris shields on the National Ignition Facility (NIF) are a key factor for the successful conduct and affordable operation of the facility. The improvements required over Nova debris shields are described. Estimates of debris shield lifetimes in the presence of target emissions with 4 - 5 J/cm{sup 2} laser fluences (and higher) indicate lifetimes that may contribute unacceptably to operations costs for NIF. We are developing detailed guidance for target… more
Date: July 26, 2000
Creator: Tobin, M.; Eder, D.; Braun, D. & MacGowan, B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Material and electromagnetic properties of Faraday shields for ion cyclotron heating antennas

Description: The Faraday shields for ion cyclotron antennas must transmit magnetic waves and adsorb little rf power. To investigate these properties, we have constructed 27 Faraday shields in many configurations, including chevrons, tubes, straps, concentric rings, various layered shields, conventionally leafed straps, and replicas of the Faraday shields for ASDEX, the Joint European Torus (JET), TEXTOR, and Alcator-C. We have measured the magnetic flux and observed loading at various operating resistances … more
Date: January 1, 1985
Creator: Hoffman, D.J.; Becraft, W.R.; Baity, F.W.; Caughman, J.B.O. & Tsai, C.C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Heat Generation in Thermal Shields

Description: "Heat production resulting from the absorption of gamma ray photons in thermal shields and the leakage of neutrons and photons from ferritic thermal shields are investigated. The gamma rays considered arise from three types of reactor radiation -- thermal neutrons, fast neutrons, and core and reflector gammas. The energy spectra of the fast neutron leakage and absorption have been investigated in some detail because of the significant contribution of fast neutrons to the heating of the concre… more
Date: August 15, 1954
Creator: Heisler, M. & Wetch, J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Using Laser Entrance Hole Shields to Increase Coupling Efficiency in Indirect Drive Ignition Targets for the National Ignition Facility (NIF)

Description: Coupling efficiency, the ratio of the capsule absorbed energy to the driver energy, is a key parameter in ignition targets. The hohlraum originally proposed for NIF coupled {approx}11% of the absorbed laser energy to the capsule as x-rays. We describe here a second generation of hohlraum target which has higher coupling efficiency, {approx}16%. Because the ignition capsule's ability to withstand 3D effects increases rapidly with absorbed energy, the additional energy can significantly increase … more
Date: November 3, 2005
Creator: Callahan, D. A.; Amendt, P. A.; Dewald, E. L.; Haan, S. W.; Hinkel, D. E.; Izumi, N. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Implication of the Transport Equation for the Semiempirical Treatment of Shields

Description: Note presenting a revision of the semiempirical method of dealing with shields by treating them as composed of layers by taking the angular distribution of the radiation into account and by making use of the transport equation. The method is illustrated by consideration of the effect upon neutrons of a thick nonabsorbing shield of high atomic weight.
Date: March 1952
Creator: Schwed, Philip
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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UNCOLLIDED FLUX FROM FINITE CIRCULAR AND RECTANGULAR CYLINDERS

Description: Expressions are derived for the uncollided flux from finite cylindrical sources with circular and rectangular cross sections. The source density is assumed to be completely arbitrary in the rectangular case and arbitrary to within independence of the aximuth in the circular case. The circular cylinder is assumed surrounded by an arbitrary number of concentric cylindrical shields and by plane circular shields above (or below) its upper (or lower) face. The rectangular source is treated with plan… more
Date: December 1, 1958
Creator: Anderson, D.C. & O'Reilly, B.D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department

Alice Shields (excerpt)

Description: Recording of Otto Luening's Alice Shields (excerpt).
Access: Restricted to UNT Community Members. Login required if off-campus.
Date: unknown
Duration: 5 minutes 47 seconds
Creator: Luening, Otto, 1900-1996
Item Type: Refine your search to only Sound
Partner: UNT Music Library
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Pulse-echo ultrasonic inspection system for in-situ nondestructive inspection of Space Shuttle RCC heat shields.

Description: The reinforced carbon-carbon (RCC) heat shield components on the Space Shuttle's wings must withstand harsh atmospheric reentry environments where the wing leading edge can reach temperatures of 3,000 F. Potential damage includes impact damage, micro cracks, oxidation in the silicon carbide-to-carbon-carbon layers, and interlaminar disbonds. Since accumulated damage in the thick, carbon-carbon and silicon-carbide layers of the heat shields can lead to catastrophic failure of the Shuttle's heat … more
Date: June 1, 2005
Creator: Roach, Dennis Patrick; Walkington, Phillip D. & Rackow, Kirk A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Debris and Shrapnel Mitigation Procedure for NIF Experiments

Description: All experiments at the National Ignition Facility (NIF) will produce debris and shrapnel from vaporized, melted, or fragmented target/diagnostics components. For some experiments mitigation is needed to reduce the impact of debris and shrapnel on optics and diagnostics. The final optics, e.g., wedge focus lens, are protected by two layers of debris shields. There are 192 relatively thin (1-3 mm) disposable debris shields (DDS's) located in front of an equal number of thicker (10 mm) main debris… more
Date: September 4, 2007
Creator: Eder, D.; Koniges, A.; Landen, O.; Masters, N.; Fisher, A.; Jones, O. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Evaluation of Heat Shields from RTS Wright Industries Magnesium and Uranium Beds

Description: Heat shields from a factory test of the furnaces that will be used to heat the magnesium and uranium beds for the tritium extraction facility (TEF) were examined to determine the cause of discoloration. The samples were examined using visual, optical microscopy, electron microscopy, x-ray spectroscopy, and Auger electron spectroscopy.
Date: October 29, 2002
Creator: Korinko, P.S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The Effect of Tip Shields on a Horizontal Tail Surface

Description: A series of experiments made in the wind tunnel of the Daniel Guggenheim School of Aeronautics, New York University, on the effect of tip shields on a horizontal tail surface are described and discussed. It was found that some aerodynamic gain can be obtained by the use of tip shields though it is considered doubtful whether their use would be practical.
Date: August 1928
Creator: Dronin, Paul V.; Ramsden, Earl I. & Higgins, George J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Measurements of the electrostatic and electromagnetic fields of Faraday shielding half-turn loop type ICRF antennae

Description: Detailed measurements of both the electrostatic and electromagnetic fields are performed for various types of Faraday shields mounted on PLT ICRF antennae. The data show that the shields have little effect on the electromagnetic fields when the antenna is driven such that it is generating a constant total flux for the various cases. A new type of shield (Type II) is investigated that has no effect on the antenna inductance and performs equally as well as the conventional shields (Type I) in shi… more
Date: December 1, 1984
Creator: Fortgang, C.M. & Hwang, D.Q.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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