Explanipedia

Temporal control of radiation pulse using gas filled drift cells on HERMES III Open

T.W.L. Sanford, D. R. Welch, R. C. Mock · 2008

Significant erosion of the front of the HERMES-III electron beam in drift cells filled with N[sub 2] gas is measured for pressures greater than 100 Torr (as much as 10 ns [3 m] at 630 Torr for 11-m length cells). Little rise time (RT) shar…

Comparative properties of the interior and blowoff plasmas in a dynamic hohlraum Open

J. P. Apruzese, R. W. Clark, J. Davis, T. W. L. Sanford, T. J. Nash , et al. · 2007

Physics

A Dynamic Hohlraum (DH) is formed when arrays of tungsten wires driven by a high-current pulse implode and compress a cylindrical foam target. The resulting radiation is confined by the wire plasma and forms an intense, ∼200–250eV Planckia…

Compound-lens diode for hermes III Open

T. W. L. Sanford, J.A. Halbleib, J. W. Poukey, Timothy J. Sheridan, Daniel Muirhead , et al. · 2005

Physics Materials science Engineering

Significantly improved spatial uniformity of bremsstrahlung radiation, relative to a diode with a planar anode, is predicted for the HERMES III accelerator when a compound-lens diode is used to actively control the high-power electron beam…

Photoneutron Production on HERMES III Using an Intense Bremsstrahlung Source Open

T. W. L. Sanford, J.A. Halbleib, L.J. Lorence, J.G. Kelly, Paul F. Griffin , et al. · 2005

Physics

An intense reusable source of pulsed photoneutrons has been developed for HERMES III, delivering 0.5 to 1 {times} 10{sup 14} n/pulse with an average kinetic-energy of 1.8 to 1.3 MeV, respectively, over a useful area of 150 cm{sup 2} in a p…

Progress in z-pinch driven dynamic-hohlraums for high-temperature radiation-flow and ICF experiments at Sandia National Laboratories Open

T.W.L. Sanford, T. J. Nash, Richard E. Olson, David E. Bliss, R. W. Lemke , et al. · 2004

Physics Engineering

Progress in understanding the physics of dynamic-hohlraums is reviewed for a system capable of generating 13 TW of axial radiation for high temperature (>200 eV) radiation-flow experiments and ICF capsule implosions.

THE APPLICATION OF 2-D SIMULATIONS TO Z-PINCH EXPERIMENT DESIGN AND ANALYSIS Open

Donald L. Peterson, R. L. Bowers, W. Matuska, G. A. Chandler, C. Deeney , et al. · 2004

Physics Computer science Engineering

The successful 2-D simulations of z-pinch experiments (reproducing such features as the measured experimental current drive, radiation pulse shape, peak power and total radiated energy) can lead to a better understanding of the underlying …

Dynamics of a Z-pinch x-ray source for heating inertial-confinement-fusion relevant hohlraums to 120–160 eV Open

T. W. L. Sanford, R. E. Olson, R. C. Mock, G. A. Chandler, R. J. Leeper , et al. · 2000

Physics

A Z-pinch radiation source has been developed that generates 60±20 kJ of x rays with a peak power of 13±4 TW through a 4-mm-diam axial aperture on the Z facility. The source has heated National Ignition Facility-scale (6-mm-diam by 7-mm-hi…

Characteristics of ICF Relevant Hohlraums Driven by X-Rays from a Z-Pinch Open

T.W.L. Sanford, Richard E. Olson, Roger Alan Vesey, G. A. Chandler, D. E. Hebron , et al. · 2000

Physics Engineering

Radiation environments characteristic of those encountered during the low-temperature foot pulse and subsequent higher-temperature early-step pulses (without the foot pulse) required for indirect-drive ICF ignition on the National ignition…

Z-Pinch Generated X-Rays Demonstrate Indirect-Drive ICF Potential Open

R. L. Bowers, G. A. Chandler, Derzon, D. E. Hebron, R. J. Leeper , et al. · 1999

Physics

Hohlraums (measuring 6-mm in diameter by 7-mm in height) have been heated by x-rays from a z-pinch. Over measured x-ray input powers P of 0.7 to 13 TW, the hohlraum radiation temperature T increases from {approximately}55 to {approximately…

High-temperature dynamic hohlraums on the pulsed power driver <i>Z</i> Open

T. J. Nash, M. S. Derzon, G. A. Chandler, R. J. Leeper, D. L. Fehl , et al. · 1999

Physics

In the concept of the dynamic hohlraum an imploding Z pinch is optically thick to its own radiation. Radiation may be trapped inside the pinch to give a radiation temperature inside the pinch greater than that outside the pinch. The radiat…

Wire array Z-pinch insights for enhanced x-ray production Open

T. W. L. Sanford, R. C. Mock, R. B. Spielman, M. G. Haines, J. P. Chittenden , et al. · 1999

Physics Computer science

Comparisons of measured total radiated x-ray power from annular wire-array z-pinches with a variety of models as a function of wire number, array mass, and load radius are reviewed. The data, which are comprehensive, have provided importan…

Z-Pinch Driven Inertial Confinement Fusion Target Physics Research at Sandia National Laboratories Open

Tara Alberts, J. R. Asay, Petr Bača, K. L. Baker, S. P. Breeze , et al. · 1998

Physics Engineering

Three hohlraum concepts are being pursued at Sandia National Laboratories (SNL) to investigate the possibility of using pulsed power driven magnetic implosions (z-pinches) to drive high gain targets capable of yields in the range of 200-10…

Variation of high-power aluminum-wire array Z-pinch dynamics with wire number, array radius, and load mass Open

T. W. L. Sanford, R. C. Mock, B.M. Marder · 1997

Physics Materials science Computer science

A systematic study of annular aluminum-wire z-pinches on the Saturn accelerator shows that the quality of the implosion, including the radiated power, increases with wire number. Radiation magnetohydrodynamic (RMEC) xy simulations suggest …

Time-dependent electron temperature diagnostics for high-power, aluminum z-pinch plasmas Open

T.W.L. Sanford, T. J. Nash, R. C. Mock · 1996

Physics Materials science

Time-resolved x-ray pinhole photographs and time-integrated radially-resolved x-ray crystal spectrometer measurements of azimuthally-symmetric aluminum-wire implosions suggest that the final pinch is composed of a hot dense plasma core sur…

Intense electron-beam transport in the ion-focused regime through the collision-dominated regime Open

T. W. L. Sanford, J. W. Poukey, D. R. Welch, R. C. Mock · 1994

Physics Engineering

This paper reviews the transport of the 19-MeV, 700-kA, 25-ns Hermes-III electron beam in long gas cells filled with N{sub 2} gas spanning six decades in pressure from 10{sup 3} to {approximately}10{sup 3} Torr. We show through measurement…

Preradiation studies for non-thermal Z-pinch wire load experiments on Saturn Open

T.W.L. Sanford, D. Russell Humphreys, J. W. Poukey, B.M. Marder, J.A. Halbleib , et al. · 1994

Physics Materials science

The implosion dynamics of compact wire arrays on Saturn are explored as a function of wire mass m, wire length {ell}, wire radii R, and radial power-flow feed geometry using the ZORK code. Electron losses and the likelihood of arcing in th…

Compound-lens injector for a pulsed 13-TW electron beam Open

T.W.L. Sanford, J. W. Poukey, J.A. Halbleib, R. C. Mock · 1993

Materials science Physics Chemistry

A robust injector capable of controlling the radius and angle of incidence of the pulsed, intense, annular electron beam extracted from the HERMES III accelerator is described. The injector, called the compound lens, uses a tapered anode t…

Generation, control, and transport of a 19-MeV, 700-kA pulsed electron beam Open

T.W.L. Sanford, J.A. Halbleib, J. W. Poukey, D. R. Weicht, R. C. Mock , et al. · 1992

Physics

We show experimentally and theoretically that the generation of the 13-TW Hermes III electron beam can be accurately monitored, and that the beam can be accurately directed onto a high-Z target to produce a wide variety of bremsstrahlung p…

Production and measurement of flash X-ray dose rates in excess of 10/sup 13/ RAD (CaF/sub 2/)/s Open

T. W. L. Sanford, J.A. Halbleib, D.E. Beutler, W. H. McAtee, R. C. Mock , et al. · 1991

Physics Materials science Chemistry

The radiation field from an intense reusable source of flash x-rays that delivers a measured peak dose and dose rate of 370 {plus_minus} 60 krad (CaF{sub 2}) and (3.5 {plus_minus} 0.7) {times} 10{sup 13} rad (CaF{sub 2})/s over a useful ar…

Dose-rate field of the HERMES III flash X-ray source Open

T. W. L. Sanford, J.A. Halbleib, R. C. Mock · 1990

Physics Chemistry Mathematics

Measurements show that the HERMES III flash x-ray source produces a peak dose-rate radiation field of (5 {plus minus} 0.5) {times} 10{sup 12} rad(Si)/s over a useful area of 1000 cm{sup 2}, with a pulse width of {approximately}20 ns. Numer…

Temporal characterization of the 19-MV, 700-kA HERMES III electron beam Open

T. W. L. Sanford, J.A. Halbleib, D.L. Johnson, J. W. Poukey, J.J. Ramirez , et al. · 1990

Materials science Physics

The shot-to-shot variation of the HERMES III Accelerator parameters at the electron-beam diode, the time dependence of the electron flow in the diode, and the time dependence of the subsequent radiation produced from the bremsstrahlung tar…

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