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Two-photon physics

Description: A new experimental frontier has recently been opened to the study of two photon processes. The first results of many aspects of these reactions are being presented at this conference. In contrast, the theoretical development of research ito two photon processes has a much longer history. This talk reviews the many different theoretical ideas which provide a detailed framework for our understanding of two photon processes.
Date: October 1, 1981
Creator: Bardeen, W.A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Ion-beam inertial fusion: the requirements posed by target and deposition physics

Description: The demonstration of ICF scientific feasibility requires success in target design, driver development and target fabrication. Since these are interrelated, we present here some results of ion beam target studies and relate them to parameters of interest to ion accelerators. Ion deposition physics have long been a well known subject apart from high beam currents. Recent NRL experiments at up to 250 kA/cm/sup 2/ ions confirm the classical deposition physics now at current densities which are comp… more
Date: October 19, 1981
Creator: Mark, J.W.K.
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Partner: UNT Libraries Government Documents Department
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Fifth high-energy heavy-ion study

Description: This was the fifth of a continuing series of summer studies held at LBL to discuss high energy heavy ion collisions. Recently, a similar meeting has been held on alternate years at GSI (Darmstadt); and, in 1979, we held a meeting at LBL exclusively devoted to ultra-relativistic nuclear collisions. Two new features distinguish this study from earlier meetings in the series. First, the energy range for discussion was broadened by including collisions from about 20 MeV/nucleon to the highest avail… more
Date: October 1, 1981
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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TOPOLOGICAL THEORY OF HADRONS II: BARYONS

Description: The first paper of this series described a method for incorporating spin into the meson sector of the topological theory of hadrons. This second paper extends the theory to all hadrons. It also incorporates into the covariant S-matrix topological framework the group-theoretic properties of the constituent quark model.
Date: October 1, 1981
Creator: Stapp, Henry P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Topological bootstrap

Description: The general bootstrap idea is that all aspects of nature are determined by the requirement that they be consistent. An approach to the bootstrap idea is described in which local space-time is not a conceptual starting ingredient. The starting idea is a notion of elementary event, with a past and a future but not embedded in a continuous space time. Topics covered include entropy and the topological expansion, spin and electric charge, the quantum surface, topological supersymmetry, electroweak … more
Date: October 1, 1981
Creator: Chew, Geoffrey F.
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Partner: UNT Libraries Government Documents Department
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Perturbative QCD

Description: The discussion includes general properties of QCD perturbation expansion, onia decays, Drell-Yan, higher twist, and some miscellaneous comments about ..cap alpha../sub s/. 45 references. (GHT)
Date: October 1, 1981
Creator: Hinchliffe, I.
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Partner: UNT Libraries Government Documents Department
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LMFBR models for the ORIGEN2 computer code

Description: Reactor physics calculations have led to the development of nine liquid-metal fast breeder reactor (LMFBR) models for the ORIGEN2 computer code. Four of the models are based on the U-Pu fuel cycle, two are based on the Th-U-Pu fuel cycle, and three are based on the Th-/sup 238/U fuel cycle. The reactor models are based on cross sections taken directly from the reactor physics codes. Descriptions of the reactor models as well as values for the ORIGEN2 flux parameters THERM, RES, and FAST are giv… more
Date: October 1, 1981
Creator: Croff, A. G.; McAdoo, J. W. & Bjerke, M. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Collisional processes of interest in MFE plasma research. Annual report, October 1, 1980-September 30, 1981

Description: Research on this contract can be divided into two general topics: (1) D/sup -/ formation collision processes, and (2) the determination of scattering cross sections used to diagnose properties of magnetically-confined plasmas. For topic (1) during last year, we completed theoretical calculations on the differential (angular) scattering of H/sup 0/ and D/sup 0/ on Cs, and determined the mechanisms and trends in the electron detachment cross sections for collisions of H/sup -/ and D/sup -/ on He,… more
Date: October 15, 1981
Creator: Olson, R.E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Lepton spectrum

Description: Selected topics on the lepton spectrum are presented with special emphasis on tau decays and unpublished Mark II results from SPEAR and PEP. 42 references.
Date: October 1, 1981
Creator: Feldman, G. J.
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Partner: UNT Libraries Government Documents Department
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High-angular-momentum resonances in /sup 28/Si + /sup 28/Si scattering

Description: The initial expectation was that resonance behavior in heavy-ion systems would be limited to only a few special systems and to energies not too far above the Coulomb barrier. The past few years have shown us that this behavior has a much wider extent than was previously thought possible, although in many cases the indications of resonance behavior is at best qualitative. Results are presented for the /sup 28/Si + /sup 28/Si system - the heaviest in which resonance behavior has yet been observed… more
Date: October 1, 1981
Creator: Betts, R.R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Design and fabrication of liquid nitrogen thermal shields for the MFTF yin-yang magnets

Description: This paper documents the design and fabrication of thin liquid nitrogen-cooled panels installed on the 340-ton MFTF yin-yang superconducting magnet system. The 344 panels are made of polished 316-L stainless steel with the pillowed fluid channels formed by inflation with a high pressure gas. Strict leak-rate limits required the manufacturer to thermal shock the panels with LN/sub 2/ and then vacuum leak check them with He. The thin-walled panel supports are made from an epoxy base, fiberglass c… more
Date: October 12, 1981
Creator: Johnson, G. L.; Chang, Y. & VanSant, J. H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Development and manufacture of a Nb/sub 3/Sn superconductor for the high-field test facility

Description: The High-Field Test Facility (HFTF) project has two primary goals. The first is to establish manufacturing capability for a Nb/sub 3/Sn conductor suitable for use in a mirror fusion coil. The second is to provide a test facility for evaluating other fusion conductor designs at high fields. This paper describes some of the problems encountered and the solutions devised in working toward the first goal. Construction of the test facility coils will be described in a subsequent paper.
Date: October 20, 1981
Creator: Scanlan, R. M.; Cornish, D. N.; Spencer, C. R.; Gregory, E. & Adam, E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Design description of the large coil test facility pulse coil

Description: The Large Coil Test Facility (LCTF) is being constructed to test up to six large superconducting coils of the configuration needed for tokamak reactors. In order to subject these test coils to conditions which simulate the magnetic environment of an operating tokamak, it is necessary to provide transient vertical fields at the test coil. The LCTF does this by means of a pulse coil set which can be positioned in the bore of each coil. The coils are tested one at a time while the remaining five t… more
Date: October 1, 1981
Creator: Hussung, R. O.; Queen, C. C., Jr. & Chipley, K. K.
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Partner: UNT Libraries Government Documents Department
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Design features of the A-cell and transition coils of MFTF-B

Description: The MFTF-B transition coil and A-cell magnet designs use variations of the copper-stabilized NbTi conductor developed by LLNL for the MFTF Yin-Yang magnets. This conductor will be wound on the one inch thick (12.7 mm) stainless steel coil forms using a two-axis winding machine similar to the existing LLNL Yin-Yang winding machine. After winding, covers will be placed over the coil and welded to the coil form to form a helium-tight jacket around the conductor. These jacketed coils are then enclo… more
Date: October 23, 1981
Creator: Tatro, R. E.; Wohlwend, J. W. & Ring, D. S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Low-level-signal data acquisition for the MFTF superconducting-magnet system

Description: Acquisition of low level signals from sensors mounted on the superconducting yin-yang magnet in the Mirror Fusion Test Facility (MFTF) imposes very strict requirements on the magnet signal conditioning and data acquisition system. Of the various types of sensors required, thermocouples, strain gages, and voltage taps produce very low level outputs. These low level outputs must be accurately measured in the harsh environment of slowly varying magnetic fields, cryogenic temperatures, high vacuum,… more
Date: October 8, 1981
Creator: Montoya, C.R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Geothermal Energy Development in the Eastern United States. Final Report

Description: This document represents the final report from the Applied Physics Laboratory (APL) of The Johns Hopkins University on its efforts on behalf of the Division of Geothermal Energy (DGE) of the Department of Energy (DOE). For the past four years, the Laboratory has been fostering development of geothermal energy in the Eastern United States. While the definition of ''Eastern'' has changed somewhat from time to time, basically it means the area of the continental United States east of the Rocky Mou… more
Date: October 1, 1981
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Investigation on the enhancement of the critical current densities in bronze-process Nb/sub 3/Sn

Description: The work reported here addressed the problem of improving the critical current characteristic of a comercial multifilamentary Nb/sub 3/Sn strand by varying its heat treatment. The work was done from the perspective that the critical current characteristic is controlled by the metallurgical state of the reacted layer, which is, in turn, fixed by the processing the wire has undergone. The research was carried out in parallel with metallographic studies which analyzed the microstructure and compos… more
Date: October 1, 1981
Creator: Hong, M.; Wu, I.W.; Morris, J.W. Jr.; Gilbert, W.; Hassenzahl, W.V. & Taylor, C.
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Partner: UNT Libraries Government Documents Department
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Design, fabrication, and testing of the magnet liner supports for the Mirror Fusion Test Facility

Description: Heat is radiated from both the vacuum vessel that houses the magnet and the heated plasma that exists at the central region of the magnets. Approximately 30 kW of heat will be transmitted to the 311 m/sup 2/ of magnet surface area from these two heat sources. We can reduce this heat load substantially by installing liquid nitrogen (LN)-filled panels around the magnets to counteract the 300/sup 0/K vessel wall temperature. When flowing the LN inside the panels, the temperature drops to 85/sup 0/… more
Date: October 9, 1981
Creator: Chang, Y.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Magnet and conductor developments for the Mirror Fusion Program

Description: The conductor development and the magnet design and construction for the MFTF are described. Future plans for the Mirror Program and their influence on the associated superconductor development program are discussed. Included is a summary of the progress being made to develop large, high-field, multifilamentary Nb/sub 3/Sn superconductors and the feasibility of building a 12-T yin-yang set of coils for the machine to follow MFTF. In a further look into the future, possible magnetic configuratio… more
Date: October 9, 1981
Creator: Cornish, D.N.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Overview of the Fusion Engineering Device (FED) Design

Description: The device has a major radius of 5.0 m with a plasma minor radius of 1.3 m elongated by 1.6. Capability is provided for operating the toroidal field coils up to 10 T, but the bulk of the operations are designed for 8 T. At 8-T conditions, the fusion power is approx. 180 MW (neutron wall loading approx. 0.4 MW/m/sup 2/) and a plasma Q of approx. 5 is expected. At 10-T conditions, which are expected to be limited to about 10% of the total operations, the fusion power is approx. 450 MW (approx. 1.… more
Date: October 1, 1981
Creator: Steiner, D. & Flanagan, C. A.
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Partner: UNT Libraries Government Documents Department
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Design of 12-T Yin-Yang magnets operating in subcooled, superfluid helium. [Nb-Ti and Nb/sub 3/Sn]

Description: A conceptual design study of a large 12-T yin-yang pair of coils, typical of the plug coils envisioned for a tandem-mirror facility to follow MFTF, has been completed. Because of its larger size and field strength, the magnetic forces are much greater than those experienced on MFTF. The main purpose of this study, therefore, is to assess the feasibility of such a device, paying particular attention to mechanical stress and conductor strain. The conductor proposed operates at 15.6 kA and consist… more
Date: October 9, 1981
Creator: Cornish, D. N.; Hoard, R. W. & Baldi, R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Levitation, coating, and transport of particulate materials

Description: Several processes in various fields require uniformly thick coatings and layers on small particles. The particles may be used as carriers of catalytic materials (platinum or other coatings), as laser fusion targets (various polymer or metallic coatings), or for biological or other tracer or interactive processes. We have devised both molecular beam and electro-dynamic techniques for levitation of the particles during coating and electrodynamic methods of controlling and transporting the particl… more
Date: October 12, 1981
Creator: Hendricks, C.D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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