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in creator/contributor: "Scudder, D. W."

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High density Z pinch formed from a solid deuterium fiber

Experiments in which 250 kA have been passed through a z-pinch column formed from a thin fiber of cryogenic solid deuterium have demonstrated unexpectedly stable behavior. It has been shown that it is possible to maintain a z pinch in near radial equilibrium while it is ohmically heated from 16/sup 0/K to several hundred eV. These results have motivated an effort to increase the plasma current to 1 MA and above, giving the potential of producing reactor-relevant plasmas capable of significant t… more

Date: January 1, 1987

Creator: Hammel, J. E. & Scudder, D. W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Recent results on the dense Z-pinch

A detailed description of the ongoing high density Z-pinch experiments at Los Alamos is given. A review of past dense experiments is included. A model for a dense Z pinch as a high-Q, low yield, reactor system is presented.

Date: January 1, 1982

Creator: Hammel, J. E.; Shlachter, J. S. & Scudder, D. W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Dense Z-pinch plasmas

Early researchers recogniZed the desirable features of the linear Z-pinch configuration as a magnetic fusion scheme. In particular, a Z-pinch reactor might not require auxiliary heating or external field coils, and could constitute an uncomplicated, high plasma ..beta.. geometry. The simple Z pinch, however, exhibited gross MHD instabilities that disrupted the plasma, and the linear Z pinch was abandoned in favor of more stable configurations. Recent advances in pulsed-power technology and an a… more

Date: July 12, 1985

Creator: Shlachter, J. S.; Hammel, J. E. & Scudder, D. W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

The Los Alamos solid-deuterium-fiber z pinch: Experiment and theory

Experiments in which 250 kA have been passed through a z-pinch column formed from a thin fiber of cryogenic solid deuterium have demonstrated unexpectedly stable behavior. It has been shown that it is possible to maintain a z pinch in near radial equilibrium while it is ohmically heated from 16/sup 0/ K to several hundred eV. These encouraging results have motivated an effort to increase the plasma current to 1 MA and above, giving the potential of producing reactor-relevant plasmas capable of … more

Date: January 1, 1987

Creator: Hammel, J. E.; Scudder, D. W.; Glasser, A.; Lindman, E. & Nebel, R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Optical diagnostics on dense Z-pinch plasmas

A novel point-diffraction'' interferometer has been implemented on the Los Alamos Solid Fiber Z-Pinch experiment. The laser beam is split into two legs after passing through the plasma. The reference leg is filtered with a pin-hole aperture and recombined with the other leg to form an interferogram. This allows compact mounting of the optics and relative ease of alignment. The Z-Pinch experiment employs a pulsed-power generator that delivers up to 700 KA with a 100ns rise-time through a fiber o… more

Date: January 1, 1992

Creator: Riley, R.A. Jr.; Lovberg, R.H.; Shlachter, J.S. & Scudder, D.W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Optical diagnostics on dense Z-pinch plasmas

A novel ``point-diffraction`` interferometer has been implemented on the Los Alamos Solid Fiber Z-Pinch experiment. The laser beam is split into two legs after passing through the plasma. The reference leg is filtered with a pin-hole aperture and recombined with the other leg to form an interferogram. This allows compact mounting of the optics and relative ease of alignment. The Z-Pinch experiment employs a pulsed-power generator that delivers up to 700 KA with a 100ns rise-time through a fiber… more

Date: May 1, 1992

Creator: Riley, R. A. Jr.; Lovberg, R. H.; Shlachter, J. S. & Scudder, D. W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Multi-megagauss field-generation using capacitor banks

Design of a high-field (6 MG) production experiment on the Pegasus capacitor bank is presented. One and two dimensions MHD simulations are benchmarked against Alikhanov`s previous experiments and used to support the design for the Pegasus experiment. Possible extensions to the Atlas facility, where production of 20 Mg fields may be possible, are also discussed.

Date: September 1, 1996

Creator: Sheppard, M. G.; Bartsch, R. R.; Scudder, D. W.; Solem, J. C. & Veeser, L. R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Controls and data acquisition on Atlas

The control and data acquisition systems for Atlas will use a large degree of decentralization. By distributing control points close to the systems being controlled, the authors expect to simplify the task of isolating electronic systems from the large expected EMI pulses, allow connection of the various parts of the system by high-level fiber-optic networks, allow a simple configuration of the control and data acquisition screen rooms, and simplify the software efforts through the resulting mo… more

Date: September 1, 1997

Creator: Scudder, D. W.; Hosack, K. W.; Parsons, W. M.; Reass, W. A.; Thompson, M. C.; Wysocki, F. J. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Computational and experimental investigation of magnetized target fusion

In Magnetized Target Fusion (MTF), a preheated and magnetized target plasma is hydrodynamically compressed to fusion conditions. Because the magnetic field suppresses losses by electron thermal conduction in the fuel during the target implosion heating process, the compression may be over a much longer time scale than in traditional inertial confinement fusion (ICF). Bigger targets and much lower initial target densities than in ICF can be used, reducing radiative energy losses. Therefore, ``li… more

Date: July 1, 1996

Creator: Sheehey, P. T.; Guzik, J. A.; Kirkpatrick, R. C.; Lindemuth, I. R.; Scudder, D. W.; Shlachter, J. S. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

The Physics of the High Density Z-Pinch

The fiber-initiated High-Density Z-Pinch (HDZP) is a novel concept in which fusion plasma could be produced by applying 2 MV along a thin filament of frozen deuterium, 20-30 ..mu..m in diameter, 5-10 cm long. The megamp-range currents that result would ohmically heat the fiber to fusion temperatures in 100 ns while maintaining nearly constant radius. The plasma pressure would be held stably by the self-magnetic field for many radial sound transit times during the current-rise phase while, in th… more

Date: January 1, 1988

Creator: Glasser, A. H.; Hammel, J. E.; Lewis, H. R.; Lindemuth, I. R.; McCall, G. H.; Nebel, R. A. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Plasma flow switch and foil implosion experiments on Pegasus II

Pegasus II is the upgraded version of Pegasus, a pulsed power machine used in the Los Alamos AGEX (Above Ground EXperiments) program. A goal of the program is to produce an intense (> 100 TW) source of soft x-rays from the thermalization of the kinetic energy of a 1 to 10 MJ plasma implosion. The radiation pulse should have a maximum duration of several 10`s of nanoseconds and will be used in the study of fusion conditions and material properties. The radiating plasma source will be generated b… more

Date: July 1, 1993

Creator: Cochrane, J. C.; Bartsch, R. R.; Benage, J. R.; Forman, P. R.; Gribble, R. F.; Ladish, J. S. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Plasma flow switch and foil implosion experiments on Pegasus II

Pegasus II is the upgraded version of Pegasus, a pulsed power machine used in the Los Alamos AGEX (Above Ground EXperiments) program. A goal of the program is to produce an intense (> 100 TW) source of soft x-rays from the thermalization of the kinetic energy of a 1 to 10 MJ plasma implosion. The radiation pulse should have a maximum duration of several 10's of nanoseconds and will be used in the study of fusion conditions and material properties. The radiating plasma source will be generated b… more

Date: January 1, 1993

Creator: Cochrane, J. C.; Bartsch, R. R.; Benage, J. R.; Forman, P. R.; Gribble, R. F.; Ladish, J. S. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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The Los Alamos megamp fiber z-pinch experiment

The HDZP-II experiment uses a 2 MV, 1.9 {Omega}, 1.2 MA, 100 ns risetime pulsed-power driver. Preliminary experiments have been performed at 600--800 kA (half the bank energy). Preliminary results show the plasma heating to several kilovolts (although a non-Maxwellian distribution is likely) while maintaining an overall straight and reasonably uniform axial configuration. However, interferograms and x-ray pinhole photographs show the column expanding rapidly with considerable small-scale struct… more

Date: January 1, 1990

Creator: Scudder, D. W.; Shlachter, J. S.; Hammel, J. E.; Venneri, F.; Chrien, R. (Los Alamos National Lab., NM (USA)); Lovberg, R. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Pulsed power hydrodynamics : a new application of high magnetic fields.

Pulsed Power Hydrodynamics is a new application of high magnetic fields recently developed to explore advanced hydrodynamics, instabilities, fluid turbulences, and material properties in a highly precise, controllable environment at the extremes of pressure and material velocity. The Atlas facility at Los Alamos is the world's first and only laboratory pulsed power system designed specifically to explore this relatively new family of megagauss magnetic field applications. Constructed in 2000 an… more

Date: January 1, 2002

Creator: Reinovsky, R. E. (Robert E.); Anderson, W. E. (Wallace E.); Atchison, W. L. (Walter L.); Faehl, R. J. (Rickey J.); Keinigs, R. K. (Rhonald K.); Lindemuth, I. R. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Atlas Pulsed Power System: a Driver for Multi-Megagauss Fields

Atlas is a pulsed power machine designed for hydrodynamic experiments for the Los Alamos High Energy Density Physics Experimental program. It is presently under construction and should be operational in late 2000. Atlas will store 23 MJ at an erected voltage of 240 kV. This will produce a current of 30 MA into a static load and as much as 32 MA into a dynamic load. The current pulse will have a rise time of {approximately}5{micro}s and will produce a magnetic field driving the impactor liner of… more

Date: October 18, 1998

Creator: Cochrane, J. C.; Bartsch, R. R.; Bennett, G. A.; Bowman, D. W.; Davis, H. A.; Ekdahl, C. A. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Liner Compression of a MAGO / Inverse-Pinch Configuration

In the ''metal liner'' approach to Magnetized Target Fusion (MTF), a preheated magnetized plasma target is compressed to thermonuclear temperature and high density by externally driving the implosion of a flux conserving metal enclosure, or liner, which contains the plasma target. As in inertial confinement fusion, the principle fusion fuel heating mechanism is pdV work by the imploding enclosure, called a pusher in ICF. One possible MTF target, the hard-core diffuse z pinch, has been studied i… more

Date: May 18, 2005

Creator: Siemon, R. E.; Atchison, W. L.; Awe, T.; Bauer, B. S.; Buyko, A. M.; Chernyshev, V. K. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Atlas Pulsed Power Facility for High Energy Density Physics Experiments

The Atlas facility, now under construction at Los Alamos National Laboratory (LANL), will provide a unique capability for performing high-energy-density experiments in support of weapon-physics and basic-research programs. It is intended to be an international user facility, providing opportunities for researchers from national laboratories and academic institutions around the world. Emphasizing institutions around the world. Emphasizing hydrodynamic experiments, Atlas will provide the capabili… more

Date: June 7, 1999

Creator: Miller, R. B.; Ballard, E. O.; Barr, G. W.; Bowman, D. W.; Chochrane, J. C.; Davis, H. A. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Material science experiments on the Atlas Facility

Three material properties experiments that are to be performed on the Atlas pulsed power facility are described; friction at sliding metal interfaces, spallation and damage in convergent geomety, and plastic flow at high strain and high strain rate. Construction of this facility has been completed and experiments in high energy density hydrodynamics and material dynamics will begin in 2001.

Date: January 1, 2001

Creator: Keinigs, R. K. (Rhonald K.); Atchison, W. L. (Walter L.); Faehl, R. J. (Rickey J.); Lindemuth, I. R. (Irvin R.); Anderson, W. E. (Wallace E.); Bartsch, R. R. (Robert Richard) et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department