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34,755 Matching Results

Start Over Year 1985

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(open access)

0-D study of the compression of low temperature spheromaks

Compression of low temperature spheromak plasmas has been studied with the aid of a O-D two-fluid computer code. It is found that in a plasma which is radiation dominated, the electron temperature can be increased by up to a factor of seven for a compression of a factor of two, provided the temperature is above some critical value (approx.25eV) and the electron density particle confinement time product n/sub e/tau/sub p/ greater than or equal to 1 x 10/sup 9/s/cm/sup 3/. If the energy balance is dominated by particle confinement losses rather than radiation losses, the effect of compression is to raise the temperature as T/sub e/ approx.C/sup 6/5/, for constant tau/sub p/.

Date: September 1, 1985

Creator: Meyerhofer, D. D.; Hulse, R. A. & Zweibel, E. G.

Object Type: Report

System: The UNT Digital Library

(open access)

1-2 GeV synchrotron radiation facility at Lawrence Berkeley Laboratory

The Advanced Light Source (ALS), a dedicated synchrotron radiation facility optimized to generate soft x-ray and vacuum ultraviole (XUV) light using magnetic insertion devices, was proposed by the Lawrence Berkeley Laboratory in 1982. It consists of a 1.3-GeV injection system, an electron storage ring optimized at 1.3 GeV (with the capability of 1.9-GeV operation), and a number of photon beamlines emanating from twelve 6-meter-long straight sections, as shown in Fig. 1. In addition, 24 bending-magnet ports will be avialable for development. The ALS was conceived as a research tool whose range and power would stimulate fundamentally new research in fields from biology to materials science (1-4). The conceptual design and associated cost estimate for the ALS have been completed and reviewed by the US Department of Energy (DOE), but preliminary design activities have not yet begun. The focus in this paper is on the history of the ALS as an example of how a technical construction project was conceived, designed, proposed, and validated within the framwork of a national laboratory funded largely by the DOE.

Date: October 1, 1985

Creator: Berkner, K.H.

Object Type: Article

System: The UNT Digital Library

(open access)

1 to 2 GeV/c beam line for hypernuclear and kaon research

A kaon beam line operating in the range from 1.0 to 2.0 GeV/c is proposed. The line is meant for kaon and pion research in a region hitherto inaccessible to experimenters. Topics in hypernuclear and kaon physics of high current interest include the investigation of doubly strange nuclear systems with the K/sup -/,K/sup +/ reaction, searching for dibaryon resonances, hyperon-nucleon interactions, hypernuclear ..gamma.. rays, and associated production of excited hypernuclei. The beam line would provide separated beams of momentum analyzed kaons at intensities greater than 10/sup 6/ particles per spill with a momentum determined to one part in a thousand. This intensity is an order of magnitude greater than that currently available. 63 references.

Date: February 15, 1985

Creator: Chrien, R. E.

Object Type: Report

System: The UNT Digital Library

(open access)

N = 2 Maxwell-Einstein Supergravity Theories: Their Compact and Non-Compact Gaugings and Jordan Algebras

In this talk we give a review of our work on the construction and classification of N = 2 Maxwell-Einstein Supergravity theories (MESGT), study of the underlying algebraical and geometrical structure of these theories, and their compact and non-compact gaugings. We begin by summarizing our construction of the N = 2 MESGT's in five dimensions and give a geometrical interpretation to various scalar dependent quantities in the Lagrangian, based on the constraiants implied by supersymmetry. This is followed by a complete classification of the N = 2 MESGT's whose target manifolds parametrized by the scalar fields are symmetric spaces. 39 refs.

Date: January 1, 1985

Creator: Guenaydin, M.; Sierra, G. & Townsend, P.K.

Object Type: Article

System: The UNT Digital Library

(open access)

6. 4 Tesla dipole magnet for the SSC

A design is presented for a dipole magnet suitable for the proposed SSC facility. Test results are given for model magnets of this design 1 m long and 4.5 m long. Flattened wedge-shaped cables (''keystoned'') are used in a graded, two-layer ''cos theta'' configuration with three wedges to provide sufficient field uniformity and mechanical rigidity. Stainless steel collars 15 mm wide, fastened with rectangular keys, provide structural support, and there is a ''cold'' iron flux return. The outer-layer cable has 30 strands of 0.0255 in. dia NbTi multifilamentary wire with Cu/S.C. = 1.8, and the inner has 23 strands of .0318 in. dia wire with Cu/S.C. = 1.3. Performance data is given including training behavior, winding stresses, collar deformation, and field uniformity.

Date: May 1, 1985

Creator: Taylor, C.E.; Caspi, S.; Gilbert, W.; Meuser, R.; Mirk, K.; Peters, C. et al.

Object Type: Article

System: The UNT Digital Library

(open access)

6. 4 tesla dipole magnet for the SSC. Revision

A design is presented for a dipole magnet suitable for the proposed SSC facility. Test results are given for model magnets of this design 1 m long and 4.5 m long. Flattened wedge-shaped cables (''keystoned'') are used in a graded, two-layer ''cos theta'' configuration with three wedges to provide sufficient field uniformity and mechanical rigidity. Stainless steel collars 15 mm in radial depth, fastened with rectangular keys, provide structural support, and there is a ''cold'' iron flux return. The outer-layer cable has 30 strands of 0.648 mm diameter NbTi multifilamentary wire with Cu/S.C. = 1.8, and the inner has 23 strands of 0.808 mm diameter wire with Cu/S.C. = 1.3. Performance data are given, including training behavior, winding stresses, collar deformation, and field uniformity. 10 refs., 11 figs.

Date: August 1, 1985

Creator: Taylor, C.E.; Caspi, S.; Gilbert, W.; Hassenzahl, W.; Meuser, R.; Mirk, K. et al.

Object Type: Article

System: The UNT Digital Library

(open access)

6 GeV light source project cost estimating procedure

To maintain uniformity in estimating the cost requirements of the various components of the 6 GeV Light Source, the following procedure will be used by all the task groups. The procedure uses a Work Breakdown Structure (VBS) to break down the project into manageable, easy to estimate, components. The project is first broken down into major tasks or categories. Then each major division is continuously subdivided until the desired level of detail is achieved. This can be shown best by using the example of the WBS of the Aladdin Upgrade Project, excerpts of which are included in Appendix A.

Date: October 23, 1985

Creator: unknown

Object Type: Report

System: The UNT Digital Library

(open access)

10-MHz high-voltage modulator with pulse-width and repetition-rate agility

Requirements for control and rapid switching of the proton beam at the Los Alamos Meson Physics Facility (LAMPF) are continually revised to support accelerator upgrades and modifications. A recent upgrade required the development of a 10-MHz high-voltage modulator for an electrostatic kicker with real-time control of pulse width and repetition rate over a range of four decades. The modulator must be capable of producing a voltage pulse across a capacitive load with a rise time of less than or equal to20 ns (10% to 90%). In addition the falling edge undershoot must be controlled to less than one part in 10/sup 3/. The paper describes in detail the circuit design philosophy, layout, and critical areas in system design.

Date: January 1, 1985

Creator: Krausse, G.J.

Object Type: Article

System: The UNT Digital Library

(open access)

14 MeV neutron work at the Lawrence Livermore National Laboratory

The 14 MeV neutron work at Lawrence Livermore National Laboratory (LLNL) covers two main areas of interest to this Symposium: (1) measurements and calculations of differential cross sections; and (2) integral measurements of the neutron and gamma emission spectra. In both areas a large number of materials have been studied, spanning a wide mass range (6 < A < 239), of interest to fusion and hybrid reactors. In this presentation a brief description of the experimental techniques and calculational analysis is given for each of the above areas and the measured and calculated cross sections are discussed. 28 refs., 7 figs., 3 tabs.

Date: July 1, 1985

Creator: Hansen, L. F.

Object Type: Article

System: The UNT Digital Library

(open access)

20 keV undulators for a 6-GeV storage ring

The main goal of the future 6-GeV electron storage ring is to provide 20-keV fundamental harmonic radiations from insertion devices. Parameter restrictions of REC-vanadium permendur hybrid undulators have been examined. The critical factor is the achievable minimum gap of the undulator. Variations of the spectral brilliance for different beam parameters are also shown. 6 refs., 5 figs.

Date: January 1, 1985

Creator: Kim, S. H. & Cho, Y.

Object Type: Article

System: The UNT Digital Library

(open access)

32-Bit computer for large memory applications on FASTBUS

A FASTBUS based 32-bit computer is being built at Los Alamos National Laboratory for use in systems requiring large fast memory in the FASTBUS environment. A separate local execution bus allows data reduction to proceed concurrently with other FASTBUS operations. The computer, which can operate in either master or slave mode, includes the National Semiconductor NS32032 chip set with demand paged memory management, floating point slave processor, interrupt control unit, timers, and time-of-day clock. The 16.0 megabytes of random access memory are interleaved to allow windowed direct memory access on and off the FASTBUS at 80 megabytes per second.

Date: January 1, 1985

Creator: Blossom, J. M.; Hong, J. P. & Kellner, R. G.

Object Type: Article

System: The UNT Digital Library

(open access)

32-Bit FASTBUS computer

Los Alamos National Laboratory is building a 32-bit FASTBUS computer using the NATIONAL SEMICONDUCTOR 32032 central processing unit (CPU) and containing 16 million bytes of memory. The board can act both as a FASTBUS master and as a FASTBUS slave. It contains a custom direct memory access (DMA) channel which can perform 80 million bytes per second block transfers across the FASTBUS.

Date: January 1, 1985

Creator: Blossom, J.M.; Hong, J.P. & Kellner, R.G.

Object Type: Article

System: The UNT Digital Library

(open access)

209-E Upgrades

Pacific Northwest Laboratory has initiated a review of the Safeguards and Security systems at the Critical Mass Laboratory with regards to determining appropriate upgrading actions that assure that an effective and efficient Safeguards and Security posture consistent with DOE-RL policies, procedures, and priorities is effected. As a result of this review, PNL has concluded that specific upgrades are required at CML that provide a demonstrated enhancement to the overall security posture of the facility and are based upon prudent expenditures of government funds. It was further concluded that additional recommended upgrades provide minimal improvement to the overall security system at a significant outlay of funds.

Date: February 4, 1985

Creator: Merrill, B. J. & DeMyer, J. J.

Object Type: Report

System: The UNT Digital Library

[300 block of Ave F]

Photograph of the 300 block of Ave F in Johnson City, Texas.

Date: October 1, 1985

Creator: Texas Historical Commission

Object Type: Photograph

System: The Portal to Texas History

(open access)

300-Element Silicon-Lithium Position-Sensitive Imaging Detector for Angiography

Silicon lithium-drifted (Si(Li)) detectors 150 mm long, 10 mm wide and 5 mm thick with 300 individual elements have been fabricated as imaging detectors for noninvasive studies of human coronary arteries using 33 keV x-rays from a synchrotron radiation beamline. This detector is an extension of earlier work on 30 mm long devices with initially 30 and later 60 elements. The detector fabrication details are discussed highlighting problems in uniform lithium-ion compensation. The device structure is examined and measurements on the interelement impedances presented. Finally an angiograph of the coronary arteries in an excised pig's heart obtained with this 300-element detector is presented. 14 refs., 6 figs.

Date: October 1, 1985

Creator: Walton, J. T.; Sommer, H. A.; Thompson, A. C.; Hughes, E. B. & Zeman, H. D.

Object Type: Article

System: The UNT Digital Library

(open access)

E-740 proportional drift tube tests

The D0 muton detector will consist of large area arrays of proportional drift tubes (PDT's). The beam crossing repetition rate together with the trigger processing time will constrain the maximum drift time to be about one microsecond, corresponding to a drift distance of about 5.0 cm. With such a narrow cell width, it is possible to use rather long cells (up to 6.0 meters) and still keep cell occupancy acceptable. To simplify track reconstruction, space points will be recorded for each track. This will be accomplished using shaped cathode pads to measure the longitudinal coordinate by the ratio of induced charges. In order to have minimal thickness of the PDT arrays, a rectangular cross section has been chosen with an aspect ratio of about 3:1. This choice has necessitated the use of field shaping electrodes to maintain approximately uniform drift velocities. The test cell presented here incorporates cathode pads which have been designed for both longitudinal position measurement and field shaping.

Date: March 1, 1985

Creator: Brown, C.; Green, D.; Haggerty, H.; Hansen, S.; Hedin, D.; Jostlein, H. et al.

Object Type: Report

System: The UNT Digital Library

(open access)

1500-MeV fixed-field alternating-gradient synchrotron for a pulsed-spallation neutron source

The first conceptual design of the FFAG for ASPUN was an 1100-MeV, 20-sector machine with an injection radius of 17.5 m and an extraction radius of 18.75 m. The conceptual design currently under study has a higher extraction energy, a larger average radius, but still has 20 sectors. The current interest in higher extraction energy is stimulated by calculations that indicate that the useful neutron production per incident proton is still increasing proportionally up to 1500 MeV. The larger radius also matches existing buildings at Argonne that could be made available for the facility. 11 refs., 4 figs., 3 tabs.

Date: January 1, 1985

Creator: Kustom, R.L.; Khoe, T.K. & Crosbie, E.A.

Object Type: Article

System: The UNT Digital Library