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Electromagnetic Effects in Relativistic Electron Beam Plasma Interactions

Description: Electromagnetic effects excited by intense relativistic electron beams in plasmas are investigated using a two-dimensional particle code. The simulations with dense beams show large magnetic fields excited by the Weibel instability as well as sizeable electromagnetic radiation over a significant range of frequencies. The possible relevance of beam plasma instabilities to the laser acceleration of particles is briefly discussed. 6 refs., 4 figs.
Date: February 13, 1985
Creator: Kruer, W. L. & Langdon, A. B.
Partner: UNT Libraries Government Documents Department
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Initial measurements of beam breakup instability in the advanced test accelerator

Description: This paper reports the measurements of beam breakup (BBU) instability performed on the Advanced Test Accelerator (ATA) up to the end of February, 1984. The main objective was to produce a high current usable electron beam at the ATA output. A well-known instability is BBU which arises from the accelerator cavity modes interacting with the electron beam. The dominant mode is TM/sub 130/ at a frequency of approximately 785 MHz. It couples most strongly to the beam motion and has been observed to … more
Date: May 13, 1985
Creator: Chong, Y.P.; Caporaso, G.J. & Struve, K.W.
Partner: UNT Libraries Government Documents Department
open access

Physics of supernovae

Description: Presupernova models of massive stars are presented and their explosion by ''delayed neutrino transport'' examined. A new form of long duration Type II supernova model is also explored based upon repeated encounter with the electron-positron pair instability in stars heavier than about 60 Msub solar. Carbon deflagration in white dwarfs is discussed as the probable explanation of Type I supernovae and special attention is paid to the physical processes whereby a nuclear flame propagates through d… more
Date: December 13, 1985
Creator: Woosley, S. E. & Weaver, T. A.
Partner: UNT Libraries Government Documents Department
open access

Multiplicities in high energy interactions

Description: This paper reviews the data on multiplicities in high energy interactions. Results from e/sup +/e/sup -/ annihilation, from neutrino interactions, and from hadronic collisions, both diffractive and nondiffractive, are compared and contrasted. The energy dependence of the mean charged multiplicity, <n/sub ch/>, as well as the rapidity density at Y = 0 are presented. For hadronic collisions, the data on neutral pion production shows a strong correlation with <n/sub ch/>. The heavy particle fracti… more
Date: May 13, 1985
Creator: Derrick, M.
Partner: UNT Libraries Government Documents Department
open access

Collective accelerator for electron colliders

Description: A recent concept for collective acceleration and focusing of a high energy electron bunch is discussed, in the context of its possible applicability to large linear colliders in the TeV range. The scheme can be considered to be a member of the general class of two-beam accelerators, where a high current, low voltage beam produces the acceleration fields for a trailing high energy bunch.
Date: May 13, 1985
Creator: Briggs, R. J.
Partner: UNT Libraries Government Documents Department
open access

Cascade Inertial-Confinement-Fusion Power Plant

Description: The Cascade reactor is double-cone shaped with a maximum radius of 5 m. It rotates at 50 rpm. The average temperature of a three-material flowing granular blanket leaving the reactor is 1440 K. Heat from the blanket is transferred to helium gas in a shell- and ceramic-tube-type heat exchanger that has a separate region for each blanket material. Diffusion of tritium from the blanket granules through the heat exchanger is only 25 Ci/d, so no intermediate loop is needed for isolation. We selected… more
Date: November 13, 1985
Creator: Pitts, J. H. & Maya, I.
Partner: UNT Libraries Government Documents Department
open access

MINIMARS: An Attractive Small Tandem Mirror Fusion Reactor

Description: Through the innovative design of a novel end plug scheme employing octopole MHD stabilization, we present the conceptual design of ''MIMIMARS'', a small commercial fusion reactor based on the tandem mirror principle. The current baseline for MINIMARS has a net electric output of 600 MWe and we have configured the design for short construction times, factory-built modules, inherently safe blanket systems, and multiplexing in station sizes of approx. 600 to 2400 MWe. We demonstrate that the compa… more
Date: November 13, 1985
Creator: Perkins, L. J.; Logan, B. G.; Doggett, J. N.; Devoto, R. S.; Nelson, W. D.; Lousteau, D. C. et al.
Partner: UNT Libraries Government Documents Department
open access

Electrical supply for MFTF-B superconducting magnet system

Description: The MFTF-B magnet system consists of 42 superconducting magnets which must operate continuously for long periods of time. The magnet power supply system is designed to meet the operational requirements of accuracy, flexibility, and reliability. The superconducting magnets require a protection system to protect against critical magnet faults of quench, current lead overtemperature, and overcurrent. The protection system is complex because of the large number of magnets, the strong coupling betwe… more
Date: February 13, 1985
Creator: Shimer, D. W. & Owen, E. W.
Partner: UNT Libraries Government Documents Department
open access

Use of the ''MURA'' transformation to generate the fields and calculate the motion of protons in the designed Argonne Mini-ASPUN FFAG Spiral Sector Accelerator

Description: As a long range goal for the production of high intensity neutrons, Argonne National Laboratory has proposed the construction of a 1.5 GeV FFAG Spiral Sector Accelerator called ASPUN. The 500-MeV injector for this proposed accelerator is a smaller FFAG Spiral Sector Accelerator named Mini-ASPUN. Until such a time as the larger machine could be built, it was planned that Mini-ASPUN would replace the present RCS now being used for the IPNS program at Argonne. In order to obtain an accurate estima… more
Date: May 13, 1985
Creator: Crosbie, E.A.
Partner: UNT Libraries Government Documents Department
open access

Harmonic generation at high peak power

Description: This report reviews progress made in recent years in frequency conversion of laser radiation. By using a material such as potassium dihydrogen phosphate (KDP), intense, coherent light is made available at wavelengths unavailable from the source laser medium. Tests were performed on an array of KDP crystals at the Nova Facility. The tests revealed unexpected losses due to various non-linear effects. (JDH)
Date: December 13, 1985
Creator: Summers, M.A.; Williams, J.D.; Johnson, B.C. & Eimerl, D.
Partner: UNT Libraries Government Documents Department
open access

Recent progress of the advanced test accelerator

Description: Attempts to further improve the beam brightness from field emission cathodes are currently centered on the issue of how beam optics and phase mixing within the injector transport tend to ''average down'' the beam brightness. Particle simulation work indicates that beam brightness can be significantly improved by simply reducing the injector transport magnetic field and losing peak transport current, i.e., only transporting that high brightness portion of the total current. The simulation result… more
Date: May 13, 1985
Creator: Prono, D.S.
Partner: UNT Libraries Government Documents Department
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