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in subjects: "Plasma Guns"

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Experimental observations and model calculations of impurity radiation in a plasma gun compact torus experiment

Several types of radiation measurements were performed on the Beta II compact forms experiment. Among these are time integrated spectra ranging in wavelength from the vuv to the uv, time resolved bolometer measurements of radiation from the x-ray to the infrared, and time and wavelength resolved measurements of certain spectral lines. It is difficult to relate any one of these measurements to plasma parameters of interest such as temperature, density, or impurity content. In this report we comp… more

Date: August 10, 1982

Creator: Goldenbaum, G. C.; Granneman, E. H. A.; Hartman, C. W.; Prono, D. S.; Taska, J. & Turner, W. C.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Startup of reversed-field mirror reactors using coaxial plasma guns

Preliminary calculations are given that indicate that a coaxial plasma gun might scale reasonably to reactor-grade operating conditions. Ongoing experiments and numerical simulations should shed some light on the validity of the described scaling laws.

Date: November 9, 1979

Creator: Smith, A. C., Jr.; Hartman, C. W.; Carlson, G. A.; Neef, W. S., Jr. & Eddleman, J. L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Studies of the Formation of Field Reversed Plasma by a Magnetized Co-Axial Plasma Gun

The gun injects axially into a drift tank followed by a magnetic mirror. For the experiments reported here, only the guide coils outside the vacuum vessel and solenoids on the plasma gun electrodes were used; the mirror coil was not energized. A stainless steel flux conserver is placed in the mirror throat to prevent the plasma from contacting the nonconducting vacuum wall in the region of the mirror. An axis encircling array of magnetic loop probes includes four diamagnetic loops and a loop wh… more

Date: May 28, 1980

Creator: Turner, W. C.; Granneman, E. H. A.; Hartman, C. W.; Prono, D. S.; Taska, J. & Smith, A. C., Jr.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Fueling by coaxial plasma guns

A review of the operational characteristics of ''snowplow'' and ''deflagration'' coaxial plasma guns is given. The injection of these plasmas into containment fields is discussed. The effect of a background plasma on low-beta injection is mentioned. The use of high-beta injection for reactor plasmas is described. (MOW)

Date: January 1, 1977

Creator: Marshall, J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Mechanical design for TMX injector system

The injector system for the Tandem Mirror Experiment (TMX) contains the components required to create and maintain a high-temperature, high-density plasma. These components include a streaming-plasma gun in each of the plug tanks to form the target-plasma, 24 neutral-beam source modules for injecting neutral deuterium atoms to heat and replace losses from the plasma, and a gas box system that applies a streaming cold gas to the plasma to stabilize it. This paper discusses the mechanical design … more

Date: October 17, 1977

Creator: Calderon, M.O.; Chen, F.F.K. & Denhoy, B.S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Photon compression in cylinders

It has been shown theoretically that intense microwave radiation is absorbed non-classically by a newly enunciated mechanism when interacting with hydrogen plasma. Fields > 1 Mg, lambda > 1 mm are within this regime. The predicted absorption, approximately P/sub rf/v/sub theta/sup e/, has not yet been experimentally confirmed. The applications of such a coupling are many. If microwave bursts approximately > 5 x 10/sup 14/ watts, 5 ns can be generated, the net generation of power from pellet fus… more

Date: January 12, 1977

Creator: Ensley, D.L.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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LASL fast liner experiment

The LASL Fast Liner Experiment explores a fusion concept in which a prepared plasma is adiabatically compressed to thermonuclear temperatures and densities by a rapidly imploding solid metal liner. A prepared plasma having ..beta.. > 1 is in contact with the liner and end plugs, and contains an embedded magnetic field to inhibit thermal conduction. Cylindrical liners are magnetically imploded by a large axial current carried in the liner shell. Theoretical estimates indicate an implosion veloci… more

Date: January 1, 1980

Creator: Sherwood, A. R.; Cantrell, E. L.; Henins, I.; Hoida, H. W.; Jarboe, T. R.; Malone, R. C. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Compact toroid experiments: spheromaks and field-reversed configurations

Compact toroids (CT) containing both poloidal and toroidal magnetic field spheromaks, are generated in the CTX experiment using a magnetized coaxial plasma gun, and are trapped and stably confined in an oblate flux conserver. Total configuration lifetimes are observed up to approx. 0.8 ms, consistent with classical resistive decay. The field reversed configuration (FRC) is a high beta, axisymmetric, highly prolate compact toroid, containing only poloidal magnetic field, formed in a field-revers… more

Date: January 1, 1982

Creator: Quinn, W. E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Development of a Plasma Streaming System for the Mirror Fusion Test Facility

The Plasma Streaming System (PSS) is an essential portion of the Mirror Fusion Test Facility (MFTF), scheduled for completion in October 1981. The PSS will develop a plasma density of at least 2 x 10/sup 12/ particles/cm/sup 3/ at the MFTF magnet centerline by injecting particles along the field lines. The plasma will have a midplane plasma radius as large as 40 cm with variable plasma particle energy and beam geometry. Minimum amounts of impurities will be injected, with emphasis on minimizing… more

Date: November 12, 1979

Creator: Holdsworth, T.; Clark, R.N.; McCotter, R.E.; Rossow, T.L. & Cruz, G.E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Theory of field-reversed mirrors and field-reversed plasma-gun experiments. Paper IAEA-CN-38/R-2

Experimental and theoretical studies of field reversal in a mirror machine are reported. Plasma-gun experiments demonstrate that reversed-field plasma layers are formed. Low energy plasma flowing behind the initially produced plasma front prevents tearing of the layer from the gun muzzle. MHD simulation shows that tearing can be obtained by impeding the slow plasma flow with a plasma divider. It is demonstrated theoretically that a field-reversed mirror imbedded in a multipole field can be sust… more

Date: May 22, 1980

Creator: Anderson, D.V.; Auerbach, S.P. & Berk, H.L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Model calculations for the explosive generator-driven dense plasma focus

A models was developed to aid in the design and interpretation of explosive generator-driven dense plasma focus experiments. Several models were investigated, but the one presented here employs a plane sheath propagating along the barrel of a Mather-type gun, entraining a constant fraction of the swept-up gas and carrying the return current between the electrodes. The motion of the sheath is determined from the momentum equation using the integrated magnetic force on the sheath. The solutions a… more

Date: February 1, 1982

Creator: Brownell, J. & Landshoff, R.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Plasma and electrical diagnostics for Procyon experiments

The aim of the Trailmaster series of experiments is to generate an intense source of soft x-rays by imploding a thin (2000 {Angstrom}) aluminum cylinder. The present scheme incorporates a plasma flow switch for the final pulse shaping and requires careful diagnostic analysis. The emphasis of this work is to transfer the energy to the load area and to understand the dynamics of the plasma flow switch. The experiments are carried out at LANL in two facilities. Laboratory experiments that answer q… more

Date: January 1, 1991

Creator: Oona, H.; Anderson, B. G.; Cochrane, J. C.; Findley, C. E.; Goforth, J. H.; Greene, A. E. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Preliminary Langmuir probe results on the CTX gun experiment

Preliminary results obtained with a double Langmuir probe in the Compact Toroid experiment facility confirm the existence of a gun plasma of n approx. 5 x 10/sup 14/ cm/sup -3/ and T approx. 10 eV lasting for approx. 250 to 400 ..mu..s, which is consistent with interferometry and Thomson scattering data. The probe current characteristics as a function of voltage suggest non-Maxwellian features of the particles distribution functions.

Date: December 1, 1981

Creator: Tuszewski, M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Introduction to the m = 1 helicity source

The m = 1 Helicity Source, formerly called the Kinked Z-pinch, was developed as part of the Electrode Studies program at Los Alamos. The Electrode Studies program was initiated to study the control of electrode erosion in long discharge duration spheromak sources. Erosion control is necessary to reduce plasma impurities and to obtain adequate electrode lifetimes. The first task of the Electrode Studies program is to determine, from among a variety of configurations including the coaxial one, a … more

Date: January 1, 1985

Creator: Platts, D. A.; Jarboe, T. R. & Wright, B. L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Extension of the operating parameters of the two stage light gas gun to velocities below 2 km/sec

No Description Available.

Date: September 7, 2007

Creator: Thoe, R S

Item Type: Article

Partner: UNT Libraries Government Documents Department

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NIMROD Resistive Magnetohydrodynamic Simulations of Spheromak Physics

The physics of spheromak plasmas is addressed by time-dependent, three-dimensional, resistive magneto-hydrodynamic simulations with the NIMROD code. Included in some detail are the formation of a spheromak driven electrostatically by a coaxial plasma gun with a flux-conserver geometry and power systems that accurately model the Sustained Spheromak Physics Experiment (SSPX) (R. D. Wood, et al., Nucl. Fusion 45, 1582 (2005)). The controlled decay of the spheromak plasma over several milliseconds … more

Date: December 11, 2007

Creator: Hooper, E. B.; Cohen, B. I.; McLean, H. S.; Wood, R. D.; Romero-Talamas, C. A. & Sovinec, C. R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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GeV electron beams from a centimeter-scale laser-driven plasmaaccelerator

esults are presented on the generation ofquasi-monoenergeticelectron beams with energy up to 1GeV using a 40TWlaser and a 3.3 cm-long hydrogen-filled capillary discharge waveguide.Electron beams were not observed without a plasma channel, indicatingthat self-focusing alone could not be relied upon for effective guidingofthe laser pulse. Results are presented of the electronbeam spectra, andthe dependence of the reliability of producingelectron beams as afunction of laser and plasma parameters.

Date: June 25, 2007

Creator: Gonsalves, A.; Nakamura, K.; Panasenko, D.; Toth, Cs.; Esarey, E.; Schroeder, C. B. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Results from the RACE (Ring ACceleration Experiment) Compact Torus Acceleration Experiment

RACE (Ring ACceleration Experiment) is a proof-of-principle experiment aimed at demonstrating acceleration of magnetically confined compact torus plasma rings to directed kinetic energies well in excess of their magnetic and thermal energies. In the course of the first year of operation the following have been observed: successful formation of rings in the RACE geometry; acceleration of rings with large forces, F/sub accelerate/ approx.F/sub equilibrium/ without apparent degradation of the ring… more

Date: June 1, 1987

Creator: Hammer, J. H.; Hartman, C. W.; Eddleman, J. L. & Kusse, B.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Use of coaxial plasma guns to start up field-reversed-mirror reactors

Application of a magnetized coaxial plasma gun for start-up of a field-reversed-mirror reactor is considered. The design is based on preliminary scaling laws and is compared to the design of the start-up gun used in the Beta II experiment.

Date: March 19, 1980

Creator: Smith, A. C., Jr.; Carlson, G. A.; Eddleman, J. L.; Hartman, C. W. & Neef, W. S., Jr.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Reconnection in Spheromak formation and sustainment

The Spheromak is a magnetic confinement device that is being explored in both the US and Japanese fusion programs. It is a member of the Compact Torus family of magnetic structures characterized by a set of closed, nested toroidal flux surfaces but without any coils, transformer cores, etc. protruding through the hole in the torus. The Speromak is closely elated to the Reversed Field Pinch (RFP) in that most of the magnetic field is produced by plasma currents flowing along the magnetic field l… more

Date: December 12, 1983

Creator: Hammer, J. H.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Nozzle model of flowing plasma with field reversal

The flowing plasma outflow from a field-reversed plasma gun is modeled by a one-dimensional calculation which is based on the well-known problem of fluid flow through a nozzle. The results suggest that a low plasma mass flow rate is necessary for reconnection to be important. Comparison with 2D MHD calculations and with preliminary data from the BETA-II experiment are consistent with the model at this time.

Date: January 7, 1980

Creator: Shearer, J.W.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Field reversal produced by a plasma gun

Experimental results are presented of the production of Field-Reversed Plasma with a high energy coaxial plasma gun. The gun is magnetized with solenoids inside the center electrode and outside the outer electrode so that plasma emerging from the gun entrains the radial fringer field at the muzzle. The plasma flow extends field lines propagating a high electrical conductivity, the flux inside the center electrode should be preserved. However, for low flux, the trapped flux exceeds by 2 or more … more

Date: April 2, 1980

Creator: Hartman, C. W.; Condit, W.; Granneman, E. H. A.; Prono, D.; Smith, A. C., Jr.; Taska, J. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Novel metal ion surface modification technique

We describe a method for applying metal ions to the near-surface region of solid materials. The added species can be energetically implanted below the surface or built up as a surface film with an atomically mixed interface with the substrate; the metal ion species can be the same as the substrate species or different from it, and more than one kind of metal species can be applied, either simultaneously or sequentially. Surface structures can be fabricated, including coatings and thin films of … more

Date: October 1, 1990

Creator: Brown, I.G.; Godechot, X. & Yu, K.M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Prospects for generating 1-10 TPa pressures with a railgun

It has been demonstrated that a plasma arc can be accelerated along two current carrying parallel rails and used to accelerate a projectile. We have performed an extensive analysis and found the task of using a railgun to accelerate an impactor plate to velocities of 10 to 40 km/s to be feasible with contemporary technology. This range of impact velocities would enable shock pressures of 1 to 10 TPa to be generated for EOS research.

Date: July 13, 1979

Creator: Hawke, R. S. & Scudder, J. K.

Item Type: Article

Partner: UNT Libraries Government Documents Department