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On the use of intense ion beams for generating magnetized target fusion plasma

Description: Magnetized Target Fusion (MTF) is a concept for creating a burning D-T plasma in a potentially inexpensive system. In essence, the concept involves ion heating on time scales short compared to ion transport times plus strong inhibition of thermal electron transport with a transverse magnetic field. The magnetic field is not intended to confine the ionic component. MTF is an intrinsically pulsed concept. A straightforward analysis of MTF indicates that D-T burning conditions can be achieved in c… more
Date: December 1, 1998
Creator: Faehl, R.J.; Wood, B.P.; Lindemuth, I.R. & Sheehey, P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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[Ion sources for surface treatments of materials]. Final report on the Contract 0248U0016-35 between the Los Alamos National Laboratory and the Institute of Electrophysics

Description: Treatment of materials by accelerated ions causes considerable changes in the microstructure and properties of the surface layer of these materials. Results of numerous laboratory studies show that ion beams are highly efficient in surface modification of materials. However, development and commercial use of ion beam technologies is hampered due to the lack of inexpensive, reliable and efficient ion sources. One of the promising directions in development of commercial ion sources is the use of … more
Date: December 1, 1998
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Applications of dielectric barrier discharges

Description: Dielectric barrier discharges (DBDs) in oxygen and air are well established for the production of large quantities of ozone and are more recently being applied to a wider range of plasmachemical processes. Here, the application of DBDs for ozone synthesis, the non-thermal oxidation of volatile organic compounds (VOCs) in air, the generation of incoherent (V)UV radiation and surface processing (etching, ashing) is presented. The main plasmaphysical features of sinusoidally-driven DBDs (transient… more
Date: December 31, 1998
Creator: Falkenstein, Z.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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The physics of fast Z pinches

Description: The spectacular progress made during the last few years in reaching high energy densities in fast implosions of annular current sheaths (fast Z pinches) opens new possibilities for a broad spectrum of experiments, from x-ray generation to controlled thermonuclear fusion and astrophysics. Presently Z pinches are the most intense laboratory X ray sources (1.8 MJ in 5 ns from a volume 2 mm in diameter and 2 cm tall). Powers in excess of 200 TW have been obtained. This warrants summarizes the prese… more
Date: July 1, 1998
Creator: Ryutov, D. D.; Derzon, M. S. & Matzen, M. K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Electron beam expansion by target heating

Description: An intense, pulsed, relativistic electron beam can heat a thin metal plate to a plasma state as it traverses. This rapid heating creates a large radial temperature gradient in the material. As heat flow is primarily by electron motion, currents arise because of the thermal gradient. This effect magnetizes the target material during the course of the beam. If this magnetization exceeds that of the vacuum field of the electron beam then it dominates beam dynamics within the material. Plasmas of i… more
Date: July 2, 1998
Creator: Garcia, M
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Applications of dielectric barrier discharges

Description: Dielectric barrier discharges (DBDs) in oxygen and air are well established for the production of large quantities of ozone and are more recently being applied to a wider range of plasmachemical processes. As an introduction of this type of gas discharge, the main plasmaphysical features of sinusoidal-driven DBDs (transient, non-thermal plasmas at atmospheric pressure) will be described, and plasmachemical reaction pathways for the generation of ozone will be briefly discussed. The generation o… more
Date: December 1, 1998
Creator: Falkenstein, Z.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Diagnostic enhancements for plasma processing

Description: This is the final report of a one-year, Laboratory Directed Research and Development (LDRD) project at the Los Alamos National Laboratory (LANL). Funds obtained under this project were used to enhance the diagnostic capabilities of the plasma-processing program in the Physics Division at LANL and include successful development and implementation of in-situ Raman spectroscopy and infrared emission spectroscopy. These methods were used to detect the presence and nature of ground-state and electro… more
Date: December 31, 1998
Creator: Selwyn, G. S. & Henins, I.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Magnetic compression/magnetized target fusion (MAGO/MTF), an update

Description: Magnetized Target Fusion (MTF) was reported in two papers at the First Symposium on Current Trends in International Fusion Research. MTF is intermediate between two very different mainline approaches to fusion: Inertial Confinement Fusion (ICF) and magnetic confinement fusion (MCF). The only US MTF experiments in which a target plasma was compressed were the Sandia National Laboratory ``Phi targets``. Despite the very interesting results from that series of experiments, the research was not pur… more
Date: March 1, 1998
Creator: Kirkpatrick, R.C. & Lindemuth, I.R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Determining how magnetic helicity injection really works. Annual progress report

Description: Magnetic helicity injection is the essential process underlying both spheromak formation and helicity injection toroidal current drive in tokamaks (e.g., HIT and NSTX). The dynamical details of the helicity injection process are poorly understood because existing models avoid a dynamic description. In particular, Taylor relaxation, the main model motivating helicity injection efforts, is an argument that predicts the state to which a turbulent magnetic configuration relaxes after all dynamics a… more
Date: October 21, 1998
Creator: Bellan, P.M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The effects of electrode cleaning and conditioning on the performance of high-energy, pulsed-power devices

Description: High-energy pulsed-power devices routinely access field strengths above those at which broad-area, cathode-initiated, high-voltage vacuum-breakdown occur (> 1e7--3e7 V/m). Examples include magnetically-insulated-transmission-lines and current convolutes, high-current-density electron and ion diodes, high-power microwave devices, and cavities and other structures for electrostatic and RF accelerators. Energy deposited in anode surfaces may exceed anode plasma thermal-desorption creation threshol… more
Date: September 1, 1998
Creator: Cuneo, M.E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Guiding of high intensity ultrashort laser pulses in plasma channels produced with the dual laser pulse ignitor-heater technique

Description: The authors present results of experimental investigations of laser guiding in plasma channels. A new technique for plasma channel creation, the Ignitor-Heater scheme is proposed and experimentally tested in hydrogen and nitrogen. It makes use of two laser pulses. The Ignitor, an ultrashort (< 100 fs) laser pulse, is brought to a line focus using a cylindrical lens to ionize the gas. The Heater pulse (160 ps long) is used subsequently to heat the existing spark via inverse Bremsstrahlung. The h… more
Date: July 1, 1998
Creator: Volfbeyn, P. & Leemans, W. P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Experimental studies of laser guiding in plasma channels

Description: The authors present results of experimental investigations of laser guiding in plasma channels. A new technique for plasma channel creation, the Ignitor-Heater scheme is proposed and experimentally tested in hydrogen and nitrogen. It makes use of two laser pulses. The Ignitor, an ultrashort (< 100 fs) laser pulse, is brought to a line focus using a cylindrical lens to ionize the gas. The Heater pulse (160 ps long) is used subsequently to heat the existing spark via inverse Bremsstrahlung. The h… more
Date: July 1, 1998
Creator: Volfbeyn, P. & Leemans, W. P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Electron cyclotron discharge cleaning (ECDC) experiments on Alcator C-Mod

Description: Experiments were performed on Alcator C-Mod with Electron Cyclotron resonance plasmas to help determine their applicability to a fusion reactor. Strong radial inhomogeneity of the plasma density was measured, decreasing by a factor of ten a few centimeters inside the resonance location, but remaining approximately constant (n{sub e} {approx} 10{sup 16} m{sup {minus}3}) outside the resonance location. Electron and ion temperatures remained mostly constant outside the resonance location ({Tau}{su… more
Date: May 1, 1998
Creator: Nachtrieb, R. T.; LaBombard, B. L.; Terry, J. L.; Reardon, J. C.; Rowan, W. L. & Wampler, W. R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Creating metallic under-dense radiators by electron beam heating prior to laser impact

Description: A pulsed, relativistic electron beam can heat a metal foil to a plasma state, and initiate an expanding flow into vacuum. At a given time in its evolution, this flow fills a nearly spherical volume with nearly uniform density, assuming a rapid expansion prior to any condensation. A metal cloud produced in this way can serve as a target of intense laser illumination to create an under-dense radiator of x-rays. The phrase ''under-dense radiator'' means that the cloud, assumed ionized, has a plasm… more
Date: December 15, 1998
Creator: Garcia, M
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Electromagnetic acceleration of material from a plate hit by a pulsed electron beam

Description: An intense pulsed electron beam traversing a thin metal plate creates a volume of dense plasma. Current flows in this plasma as a result of the charge and magnetic field introduced by the relativistic electrons. A magnetic field may linger after the electron beam pulse because of the conductivity of the material. This field decays by both diffusing out of the conducting matter and causing it to expand. If the magnetized matter is of low density and high conductivity it may expand quickly. Scali… more
Date: April 16, 1998
Creator: Garcia, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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