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15,779 Matching Results

Start Over Year 1975 Language English

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Results: 1 - 24 of 15,779 next

(open access)

1.1-meter bore, 8-Tesla test facility

The design and fabrication of a 1.1-m bore superconducting coil for an 8- T facility at Lawrence Livermore Laboratory are discussed. This facility will provide the backing field required for testing large multifilamentary Nb$sub 3$Sn coils as part of the superconductor development program at Livermore. The magnet measures 1.85 m o.d., is 1.5 m in length, and is solenoid wound in four separate modules. Total cold weight of the assembly is 18,000 Kg. A NbTi superconductor is used throughout with a gradation of current density within the magnet to provide complete cryostatic stability. The preliminary design of a large 3500-A multifilamentary Nb$sub 3$Sn insert magnet is also included. Together, the backing coil and insert magnets are designed to produce a 12-T central field in a 0.4m bore. The ''equal area'' theory of cryostatic stability is applied in the design of both magnet systems and is discussed in detail. A large open-mouth cryostat is used and measures 2 m in diameter and 3.7 m in length. Details of Dewar design and the refrigeration requirements are included. (auth)

Date: November 19, 1975

Creator: Nelson, R.; Cornish, D.; Zbasnik, J.; Sackett, S. & Taylor, C.

Object Type: Article

System: The UNT Digital Library

(open access)

1.06 μm 150 psec laser damage study of diamond turned, diamond turned/ polished and polished metal mirrors

Using a well characterized 1.06 μm 150 ps glass laser pulse the damage characteristics for diamond turned, diamond turned/ polished, and polished copper and silver mirrors less than 5 cm diameter were studied. Although most samples were tested with a normal angle of incidence, some were tested at 45$sup 0$ with different linear polarization showing an increase in damage threshold for S polarization. Different damage mechanisms observed will be discussed. Laser damage is related to residual surface influences of the fabrication process. First attempts to polish diamond turned surfaces resulted in a significant decrease in laser damage threshold. The importance of including the heat of fusion in the one dimensional heat analysis of the theoretical damage threshold and how close the samples came to the theoretical damage threshold is discussed. (auth)

Date: July 24, 1975

Creator: Saito, T. T.; Milam, D.; Baker, P. & Murphy, G.

Object Type: Article

System: The UNT Digital Library

(open access)

4$pi$ detector for correlation experiments

None

Date: June 12, 1975

Creator: Thorndike, A. M.

Object Type: Report

System: The UNT Digital Library

[5 Victorian Commercial Row Buildings]

Photograph of the five Victorian Commercial Row Buildings in Maypearl, Texas.

Date: August 12, 1975

Creator: Texas Historical Commission

Object Type: Photograph

System: The Portal to Texas History

(open access)

A-6 pyrofoil wrapper strain capability prerequisite proof tests (EML-93)

Proof test on the NRX-A6 reactor-grade foil with images.

Date: April 30, 1975

Creator: Hengstenberg, T.F.

Object Type: Report

System: The UNT Digital Library

(open access)

15-foot bubble chamber characteristics

Specifications, operation, characteristics, cost, and experience with the NAL 15-ft bubble chamber are described. Beam availability and some experimental proposals are discussed. (WHK)

Date: September 15, 1975

Creator: Huson, F. R.

Object Type: Article

System: The UNT Digital Library

(open access)

15 MeV neutron damage in Cu and Nb

An investigation was made of high-energy neutron damage in Cu and Nb irradiated with approximately 15 MeV neutrons at the Oak Ridge Isochronous Cyclotron. The neutrons were generated by bombarding a thick Be target with 40- MeV deuterons resulting in a high energy neutron spectrum broadly peaked at 15 MeV. Single crystals of Cu and Nb were irradiated at room temperature to fluences of approximately 2 x 10$sup 17$ n/cm$sup 2$. The resulting loop-type defect clusters in the crystals were characterized using x-ray diffuse scattering and transmission electron microscopy. The cluster size distributions were found to be generally similar to those characteristic of fission neutron irradiations in these materials and no multiple clusters or sub-clusters were observed. Additional comparisons with fission reactor irradiations in Cu and Nb indicate that the retained displacement damage in these crystals is approximately 3 times greater for the high-energy neutrons than for an equivalent fluence of fission neutrons. This result is consistent with detailed damage energy calculations for the Be(d,n) neutron spectrum. (auth)

Date: January 1, 1975

Creator: Roberto, J. B.; Narayan, J. & Saltmarsh, M. J.

Object Type: Article

System: The UNT Digital Library

(open access)

19 mm ballistic range: a potpourri of techniques and recipes

The expansion of ballistic gun range facilities at LLL has introduced state-of-the-art diagnostic techniques to glovebox-enclosed ballistic guns systems. These enclosed ballistic ranges are designed for the study of one- dimensional shock phenomena in extremely toxic material such as plutonium. The extension of state-of-the-art phtographic and interferometric diagnostic systems to glovebox-enclosed gun systems introduces new design boundaries and performance criteria on optical and mechanical components. A technique for experimentally evaluating design proposals is illustrated, and several specific examples (such as, target alignment, collateral shrapnel damage, and soft recovery) are discussed. (auth)

Date: September 23, 1975

Creator: Carpluk, G.T.

Object Type: Article

System: The UNT Digital Library