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Revisiting The Physics Of High-Current, Foil Opening Switches With Modern Codes
C. L. Rousculp;T. A. Gianakon;J. Goforth;R. G. Watt;T. Foley
2022 IEEE International Conference on Plasma Science (ICOPS)
Year: 2022 | Conference Paper |
Metal foils have been used extensively as high-power opening switches. The configuration consists of an electrically thin foil between dielectric insulators. The dimensions of the foil fuse are governed by the appliation, the foil material, and the resistivity. The general principle is to Joule heat the metal to vaporization causing a 10 2 increase in resistivity, but limiting it from the plasma s...Show More
New Data From the Integration of the Los Alamos MK-X and R43S6 Flux Compression Generators
J. H. Goforth;V. Z. Ahluwalia;E. V. Baca;A. T. Barnes;E. N. Brown;R. S. Bullis;C. J. Farnsworth;T. J. Foley;T. A. Gianakon;J. A. Gielata;J. A. Gunderson;B. Glover;D. H. Herrera;M. S. Jakulewicz;D. C. Jaramillo;I. D. Lopez-Pulliam;S. M. Madden;A. M. Novak;H. Oona;P. J. Rae;K. Rainey;R. C. Rettinger;C. L. Rousculp;D. N. Seitz;W. S. Shofner;R. G. Watt;J. L. Yoder;A. J. Johnson;A. J. Young
2021 IEEE Pulsed Power Conference (PPC)
Year: 2021 | Conference Paper |
Los Alamos National Laboratory has a long history of developing and fielding high explosive pulsed power (HEPP) components and systems. In recent years, the Ranchero flux compression generator (FCG or generator) has been modified for improved high current performance, and a new helical flux compression generator (HFCG), the MK-X, has been designed to provide higher initial flux for Ranchero FCGs t...Show More
New Data From the Integration of the Los Alamos MK-X and R43S6 Flux Compression Generators
J. H. Goforth;V. Z. Ahluwalia;E. V. Baca;A. T. Barnes;E. N. Brown;R. S. Bullis;C. J. Farnsworth;T. J. Foley;T. A. Gianakon;J. A. Gielata;J. A. Gunderson;B. Glover;D. H. Herrera;M. S. Jakulewicz;D. C. Jaramillo;I. D. Lopez-Pulliam;S. M. Madden;A. M. Novak;H. Oona;P. J. Rae;K. Rainey;R. C. Rettinger;C. L. Rousculp;D. N. Seitz;W. S. Shofner;R. G. Watt;J. L. Yoder;A. J. Johnson;A. J. Young
Year: 2021 | Conference Paper |
The Path to 100 MJ Ranchero Experiments
2018 16th International Conference on Megagauss Magnetic Field Generation and Related Topics (MEGAGAUSS)
Year: 2018 | Conference Paper |
Ranchero is the name given to a class of Los Alamos coaxial flux compression generators (FCGs) that are detonated simultaneously along the cylindrical axis. An experiment was reported at MG-XIV in which a Ranchero FCG produced 76 MA peak current, and in MG-XV a design was presented which was intended to overcome a weakness uncovered in the 76 MA test. The name used for the new Ranchero configurati...Show More
Improvements in Ranchero magnetic flux compression generators
J. H. Goforth;E. V. Baca;M. E. Briggs;F. L. Cochran;T. A. Gianakon;B. B. Glover;D. H. Herrera;R. L. Holmes;J. L. Johnson;E. C. Martinez;R. K. Meyer;H. Oona;D. L. Peterson;P. J. Rae;C. L. Rousculp;R. G. Watt
Los Alamos “Ranchero” Magnetic Flux Compression Generators (FCGs) have been used to power imploding liner loads. The fundamental FCG design is based on a cylindrical detonation system that expands the armature simultaneously into a coaxial generator volume and has been shown to generate currents as high as 76 MA. Analysis of the 76 MA test results revealed a weakness in the design at the output gl...Show More
Issues for high performance magnetic flux compression generators
2013 Abstracts IEEE International Conference on Plasma Science (ICOPS)
Year: 2013 | Conference Paper |
High explosive driven magnetic flux compression generators (FCGs) provide pulsed power for a variety of applications. This paper discusses issues encountered by designers requiring fast high current pulses to accelerate z-pinch loads for high energy density experiments. There are two primary concerns. The first is generating large fast-rising currents with flux compression devices. In a simple sen...Show More
High current performance of the 43 cm long Ranchero generator
J. H. Goforth;M. L. Alme;W. L. Atchison;B. B. Glover;D. H. Herrera;D. B. Holtkamp;E. M. Nelson;R. K. Meyer;H. Oona;P. J. Rae;M. G. Sheppard;A. G. Sgro;L. J. Tabaka;D. T. Torres;R. G. Watt;D. B. Reisman
2012 14th International Conference on Megagauss Magnetic Field Generation and Related Topics (MEGAGAUSS)
Year: 2012 | Conference Paper |
Cited by: Papers (1)
A Ranchero flux compression generator (FCG) was recently tested at the 76 MA level. Ranchero generators were designed to be cost effective high current devices, and a variety of configurations have been tested. The Ranchero armature is a 152 mm diameter aluminum cylinder with a 6 mm thick wall. The high explosive (HE) is detonated simultaneously on axis, and the armature is expanded by a factor of...Show More
Ranchero overview and expectations for performance at currents over 50 MA (LA-UR 11-04345)
J. H. Goforth;M. L. Alme;W. L. Atchison;B. B. Glover;D. H. Herrera;T. J. Herrera;D. B. Holtkamp;R. K. Meyer;A. Kaul;K. Molvig;E. M. Nelson;H. Oona;P. Rae;J. M. Reynolds;C. L. Rousculp;P. J. Salazar;A. G. Sgro;M. G. Sheppard;L. J. Tabaka;D. T. Torres;R. G. Watt
2011 IEEE Pulsed Power Conference
Year: 2011 | Conference Paper |
Ranchero is a coaxial magnetic flux compression generator (FCG) initiated simultaneously on-axis, which is intended to produce currents approaching 100 MA. We continue with both applications and development, striving for both cost effectiveness and high performance. In this paper we discuss on-going work, provide details of the sophisticated detonation system, and show high current predictions fro...Show More
Ranchero overview and expectations for performance at currents over 50 MA (LA-UR 11-04345)
J. H. Goforth;M. L. Alme;W. L. Atchison;B. B. Glover;D. H. Herrera;T. J. Herrera;D. B. Holtkamp;R. K. Meyer;A. Kaul;K. Molvig;E. M. Nelson;H. Oona;P. Rae;J. M. Reynolds;C. L. Rousculp;P. J. Salazar;A. G. Sgro;M. G. Sheppard;L. J. Tabaka;D. T. Torres;R. G. Watt
Year: 2011 | Conference Paper |
A new 40 MA Ranchero explosive pulsed power system
J. H. Goforth;W.L. Atchison;S. A. Colgate;J. R. Griego;J. Guzik;D. H. Herrera;D. B. Holtkamp;G. Idzorek A. Kaul;R. C. Kirkpatrick;R. Menikoff;R. K. Meyer;H. Oona;P. T. Reardon;C. R. E. Reinovsky;L. Rousculp;A. G. Sgro;L.J. Tabaka;T. E. Tierney;D. T. Torres;R. G. Watt
We are developing a new high explosive pulsed power (HEPP) system based on the 1.4 m long Ranchero generator which was developed in 1999 for driving solid density z-pinch loads. The new application requires approximately 40 MA to implode similar liners, but the liners cannot tolerate the 65 ¿s, 3 MA current pulse associated with delivering the initial magnetic flux to the 200 nH generator. To circ...Show More
A new 40 MA Ranchero explosive pulsed power system
J. H. Goforth;W.L. Atchison;S. A. Colgate;J. R. Griego;J. Guzik;D. H. Herrera;D. B. Holtkamp;G. Idzorek A. Kaul;R. C. Kirkpatrick;R. Menikoff;R. K. Meyer;H. Oona;P. T. Reardon;C. R. E. Reinovsky;L. Rousculp;A. G. Sgro;L.J. Tabaka;T. E. Tierney;D. T. Torres;R. G. Watt
Year: 2009 | Conference Paper |
Blast wave measurements of ICF hohlraum energy loss at Z
R. G. Watt;G. Idzorek;R. Kanzleiter;D. L. Peterson;R. R. Peterson;H. Tierney;T. Tierney;M. R. Jones;M. Lopez
2007 16th IEEE International Pulsed Power Conference
Year: 2007 | Conference Paper |
Inertial confinement fusion at the National Ignition Facility (NIF) is a grand challenge embraced by the nation. The designs of fusion ignition targets are based primarily on the indirect drive concept in which 351 nm laser light is absorbed by the wall of a cylindrical hohlraum, typically made of Au in current experiments. The hohlraum is an energy trapping container designed to retain as much of...Show More
Blast wave experiments at Z
T. E. Tierney;H. E. Tierney;R. G. Watt;G. C. Idzorek;R. R. Peterson;D. L. Peterson;M. R. Lopez;M. Jones
2007 16th IEEE International Pulsed Power Conference
Year: 2007 | Conference Paper |
Blast waves (BWs) form when the wave speed of an initially diffusive, supersonic radiation wave becomes subsonic and creates a radiographically-visible, hydrodynamic shock wave. BWs are a novel diagnostic in radiation-flow, code validation experiments that use Sandia’s Z-accelerator’s dynamic hohlraum (DH) as a radiative source. The physics models being tested are sensitive to delivered energy and...Show More
Radiation measurement accuracy of Z-dynamic hohlraums
2007 16th IEEE International Pulsed Power Conference
Year: 2007 | Conference Paper |
As calculational capabilities mature the data accuracy requirements become more stringent. Typical Z-pinch power measurements use multiple sets of filtered X-Ray Diodes1 (XRD) to provide temporally and spectrally resolved information on the pinch performance within a +/− 12% error bar. Integrated power measurements are provided by Ni-foil bolometers2 with +/− 10% accuracyShow More
Blast Wave Experiments at Z
Thomas E. Tierney;Robert G. Watt;George Idzorek;Darrell L. Peterson;Robert R. Peterson;Heidi E. Tierney;Mike R. Lopez;Michael Jones
2007 IEEE 34th International Conference on Plasma Science (ICOPS)
Year: 2007 | Conference Paper |
Summary form only given. Blast waves (BWs) occur when the wave speed of an initially diffusive, supersonic radiation wave becomes subsonic and forms a hydrodynamic shock wave, which is radiographically visible. BWs are a novel diagnostic in radiation-flow, code-validation experiments that use Sandia's Z-accelerator's dynamic hohlraum (DH) as a radiative source. The physics models being tested are ...Show More
Blast Wave Measurements of ICF Hohlraum Energy Loss at Z
Robert G. Watt;Randall J. Kanzleiter;Thomas E. Tierney;George Idzorek;Robert R. Peterson;Mike R. Lopez;Michael Jones
2007 IEEE 34th International Conference on Plasma Science (ICOPS)
Year: 2007 | Conference Paper |
Cited by: Papers (1)
Summary form only given. The Z dynamic hohlraum (DH) was used to examine several inertial confinement fusion problems including radiation transport. In these experiments, a copper-walled hohlraum is mounted above the DH to capture ~100 kJ of axially-emitted quasi-Planckian radiation (Trad ~ 180-220 eV). A 1-mm diameter hole was placed at the top of the hohlraum, while on a fraction of targets a 40...Show More
Radiation Measurement Accuracy of Z-Dynamic Hohlraums
2007 IEEE 34th International Conference on Plasma Science (ICOPS)
Year: 2007 | Conference Paper |
Cited by: Papers (1)
Summary form given. As calculational capabilities mature the data accuracy requirements become more stringent. Typical Z-pinch power measurements use multiple sets of filtered X-Ray Diodes (XRD) to provide temporally and spectrally resolved information on the pinch performance within a +/-12% error bar. Integrated power measurements are provided by Ni-foil bolometers with +/-10% accuracy Los Alamo...Show More
Dynamic Hohlraum Z-Pinches as Radiation Sources for High Energy Density Experiments
Robert R. Peterson;Darrell L. Peterson;Robert G. Watt;Heidi E. Tierney;Thomas E. Tierney;George C. Idzorek;Glenn R. Magelssen;Randall J. Kanzleiter;James E. Bailey;Michael Jones;Michael Lopez;Gregory A. Rochau;Thomas W. L. Sanford
2006 IEEE International Conference on Megagauss Magnetic Field Generation and Related Topics
Year: 2006 | Conference Paper |
Dynamic hohlraum (DH) z-pinches on the Z machine at Sandia National Laboratories have proven to be an excellent radiation source for driving high energy density experiments. The Z DH source produces as much as 100 kJ with powers up to 17 TW into a 4-mm diameter, axially-located radiation exit hole above the source. The Sandia Laboratories' ZR upgrade of Z may be able to similarly produce 200 kJ. T...Show More
Dynamic Hohlraum Z-Pinches as Radiation Sources for High Energy Density Experiments
Robert R. Peterson;Darrell L. Peterson;Robert G. Watt;Heidi E. Tierney;Thomas E. Tierney;George C. Idzorek;Glenn R. Magelssen;Randall J. Kanzleiter;James E. Bailey;Michael Jones;Michael Lopez;Gregory A. Rochau;Thomas W. L. Sanford
Year: 2006 | Conference Paper |
Radiation Power Measurements of Dynamic Hohlraums on the Z-Machine
G. C. Idzorek;R. G. Watt;D. L. Peterson;T.W. L. Sanford;R. C. Mock;M. R. Lopez
IEEE Conference Record - Abstracts. 2005 IEEE International Conference on Plasma Science
Year: 2005 | Conference Paper |
Summary form only given. Critical parameters required to perform a radiation-flow experiment on a Z-pinch are the drive radiation spectrum, intensity, and time history. With the advent of the dynamic hohlraum source at the Sandia National Laboratories Z-machine the diagnostic access to monitor the drive radiation was limited to one end of a cylindrical source. Initial comparisons showed large asym...Show More
Transonic Radiation Flow in Aerogel Foams as a New Power Diagnostic on Z
IEEE Conference Record - Abstracts. 2005 IEEE International Conference on Plasma Science
Year: 2005 | Conference Paper |
Summary form only given. The Sandia Z dynamic hohlraum radiation drive produces high radiation powers and energies. Using these high powers and energies, a new in-situ diagnostic has been developed and tested, that uses the super-sonic to sub-sonic transition of a Marshak radiation wave in a cylindrical block of SiO2 aerogel foam. When this transition takes place, a shock is launched, with a veloc...Show More
Wire-array holder critical in high wire-number z-pinch implosions
T.W.L. Sanford;R.C. Mock;T.L. Gilliland;J.F. Seamen;R.J. Leeper;R.G. Watt;R.E. Chrien;G.C. Idzorek;D.L. Peterson;P.U. Duselis
Digest of Technical Papers. PPC-2003. 14th IEEE International Pulsed Power Conference (IEEE Cat. No.03CH37472)
Year: 2003 | Conference Paper |
Cited by: Papers (2)
The quality of high wire-number z-pinch implosions on Z using a dynamic-hohlraum configuration is significantly affected by the method of holding the wires. The two arrangements discussed here have led to differences of a factor of 1.6/spl plusmn/0.2 in radial x-ray power, where the higher power is produced by the holder with the superior current contact at the cathode. In support of this observat...Show More
Characteristics and dynamics of a 215-eV dynamic-hohlraum x-ray source on Z
T. W. L. Sanford;D. L. Peterson;R. W. Lemke;R. C. Mock;G. A. Chandler;J. P. Chittenden;R. E. Chrien;G. C. Idzorek;R. J. Leeper;C. L. Ruiz;R. G. Watt
2002 14th International Conference on High-Power Particle Beams (BEAMS)
Year: 2002 | Conference Paper |
A radiation source has been developed on the 20-MA Z facility that produces a high power x-ray pulse (9.7±1.8 TW, 52±10 kJ), generated primarily from the interior of an imploding dynamic-hohlraum target centered along the z-axis. The radiation pulse, characterized here together with its underlying dynamics, is used for performing radiation-flow and ICF experiments with drive temperatures in excess...Show More
Top/bottom asymmetry measured in axial radiation exiting dynamic-hohlraum X-ray source on Z
T.W.L. Sanford;R.C. Mock;G.A. Chandler;R.J. Leeper;R.W. Lemke;T.A. Mehlhorn;T.J. Nash;G.S. Sarkisov;E.M. Waisman;R.E. Chrien;G.C. Idzorek;D.L. Peterson;R.G. Watt;J.P. Chittenden;M.G. Haines;S.V. Lebedev;D. Mosher
IEEE Conference Record - Abstracts. 2002 IEEE International Conference on Plasma Science (Cat. No.02CH37340)
Year: 2002 | Conference Paper |
Summary form only given, as follows. A radiation source has been developed on the 20-MA Z facility that produces a high-power x-ray pulse, generated in the positive z direction primarily from the interior of a collapsing dynamic hohlraum The hohlraum is created from a solid cylindrical CH/sub 2/ target centered within an imploding tungsten wire-array z-pinch. This pulse, which exits a 4.5 mm/sup 2...Show More
Top/bottom asymmetry measured in axial radiation exiting dynamic-hohlraum X-ray source on Z
T.W.L. Sanford;R.C. Mock;G.A. Chandler;R.J. Leeper;R.W. Lemke;T.A. Mehlhorn;T.J. Nash;G.S. Sarkisov;E.M. Waisman;R.E. Chrien;G.C. Idzorek;D.L. Peterson;R.G. Watt;J.P. Chittenden;M.G. Haines;S.V. Lebedev;D. Mosher
Year: 2002 | Conference Paper |
Variations and characteristics of dynamic Hohlraums on Z
T.W.L. Sanford;R.W. Lemke;R.C. Mock;G.A. Chandler;D.L. Fehl;D.E. Hebron;R.J. Leeper;T.A. Mehlhorn;T.J. Nash;C.L. Ruiz;S.A. Slutz;K.W. Struve;D.L. Peterson;R.E. Chrien;G.C. Idzorek;R.G. Watt
Summary form only given. Dynamic Hohlraums are being developed on Z as intense sources of X-rays for high-energy density physics (HEDP) and inertial confinement fusion (ICF) applications. Current drivers in use for these applications consist of nested arrays of tungsten wires. The arrays form a plasma shell, which implodes on a low-opacity cylindrical target centered at the z-axis. The high-atomic...Show More
Study of moderate-Z pinch performance relevant to high current drivers
G.C. Idzorek;R.E. Chrien;D.L. Peterson;R.G. Watt;G.A. Chandler;D.L. Fehl;T.W.L. Sanford
Summary form only given, as follows. Numerical simulations have been carried out to investigate the performance of moderate-Z loads with higher current machines. In particular, the scaling of radiation emission with masses and velocities ranging from 0.5 mg/cm to 30 mg/cm, and from 30 cm/μs to 60 cm/μs respectively, have been considered. Such values are consistent with peak currents above 8 MA. Th...Show More
Spectral output of Z-machine implosions
G.C. Idzorek;R.E. Chrien;D.L. Peterson;R.G. Watt;G.A. Chandler;D.L. Fehl;T.W.L. Sanford
Sandia National Laboratories Z-machine has developed into a reproducible, high power (> 200 TW), high temperature (> 200 eV) driver for radiation physics experiments. Imploding cylindrical wire arrays on the Z-machine produce a radiation source with a bolometric temperature of about 200 eV. By surrounding the z-pinch implosion with a vacuum hohlraum a nearly Planckian source of about 140 eV temper...Show More
Recent progress in static-wall hohlraum development for ICF studies
T.W.L. Sanford;R.E. Olson;J.E. Bailey;G.A. Chandler;D.L. Fehl;D.E. Hebron;J.S. Lash;R.J. Leeper;R.C. Mock;T.J. Nash;J.L. Porter;L.E. Ruggles;C.L. Ruiz;W.W. Simpson;K.W. Struve;R.A. Vesey;R.L. Bowers;R.E. Chrien;G.C. Idzorek;W. Matsuka;D.L. Peterson;R.G. Watt;R.R. Peterson;N.F. Roderick;D.B. Reisman
ICOPS 2000. IEEE Conference Record - Abstracts. 27th IEEE International Conference on Plasma Science (Cat. No.00CH37087)
Year: 2000 | Conference Paper |
Summary form only given. Radiation environments characteristic of those encountered during the low-temperature foot pulse and subsequent higher-temperature early-step pulses required for indirect-drive ICF ignition on the National Ignition Facility (NIF) are desired in order to provide a platform to better understand the dynamics of NIF hohlraums and capsules prior to NIF completion. In this paper...Show More
Recent progress in static-wall hohlraum development for ICF studies
T.W.L. Sanford;R.E. Olson;J.E. Bailey;G.A. Chandler;D.L. Fehl;D.E. Hebron;J.S. Lash;R.J. Leeper;R.C. Mock;T.J. Nash;J.L. Porter;L.E. Ruggles;C.L. Ruiz;W.W. Simpson;K.W. Struve;R.A. Vesey;R.L. Bowers;R.E. Chrien;G.C. Idzorek;W. Matsuka;D.L. Peterson;R.G. Watt;R.R. Peterson;N.F. Roderick;D.B. Reisman
Year: 2000 | Conference Paper |
The Atlas pulsed power facility for high energy density physics experiments
R.B. Miller;E.O. Ballard;G.W. Barr;D.W. Bowman;J.C. Cochrane;H.A. Davis;J.M. Elizondo;R.F. Gribble;J.R. Griego;R.D. Hicks;W.B. Hinckley;K.W. Hosack;K.E. Nielsen;J.V. Parker;M.O. Parsons;R.L. Rickets;H.R. Salazar;P.G. Sanchez;D.W. Scudder;C. Shapiro;M.C. Thompson;R.J. Trainor;G.A. Valdez;B.N. Vigil;R.G. Watt;F.J. Wysocki
Digest of Technical Papers. 12th IEEE International Pulsed Power Conference. (Cat. No.99CH36358)
Year: 1999 | Conference Paper |
Cited by: Papers (3)
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. Here, the authors describe how the primary element of Atlas is a 23-MJ capacitor bank, comprised of 96 separate Marx generators housed in 12 separate oil-filled tanks, surroundi...Show More
The Atlas pulsed power facility for high energy density physics experiments
R.B. Miller;E.O. Ballard;G.W. Barr;D.W. Bowman;J.C. Cochrane;H.A. Davis;J.M. Elizondo;R.F. Gribble;J.R. Griego;R.D. Hicks;W.B. Hinckley;K.W. Hosack;K.E. Nielsen;J.V. Parker;M.O. Parsons;R.L. Rickets;H.R. Salazar;P.G. Sanchez;D.W. Scudder;C. Shapiro;M.C. Thompson;R.J. Trainor;G.A. Valdez;B.N. Vigil;R.G. Watt;F.J. Wysocki
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