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Mohammadreza Saghafi - IEEE Xplore Author Profile

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Author details

Mohammadreza Saghafi

Also published under: Mohammad Reza Saghafi

Publications

6

Citations

70

Publications by Year

20192025

Co-Authors:

Ali AlizadehAshkan BarzkarMoein BorgheiAlireza FereidunianMona Ghassemi

Show All Co-Authors (12)

Mohammadreza Saghafi

Also published under: Mohammad Reza Saghafi

Affiliation

Virginia Tech

Arlington

VA, USA

Publication Topics

Power System,
Electric Power,
Electric Power System,
Power Loss,
Quantum Circuit,
Quantum Computing,
Voltage Levels,
3-phase,
3D Printing,
ABC Model,
AC System,
Alternating Current

Biography

Mohammadreza Saghafi (Student Member, IEEE) received the B.Sc. and M.Sc. degrees in electrical engineering from the University of Tehran, Tehran, Iran, in 2017 and 2020, respectively. He is currently pursuing the Ph.D. degree with the Bradley Department of Electrical and Computer Engineering, Virginia Tech, Blacksburg, VA, USA.,His research interests include high-voltage engineering, electrical insulation, more and all-electric aircraft, and multiphysics modeling.(Based on document published on 8 March 2022).

Publications

6

Citations

70

Publications by Year

20192025

Co-Authors:

Ali Alizadeh
Ashkan Barzkar
Moein Borghei
Alireza Fereidunian
Mona Ghassemi

Show All Co-Authors (12)

Author's Published Works

Search History

Showing 1-25 of 118 results

Conferences (95)

Journals (23)

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Single Year
B. Jones(75)
C.A. Coverdale(35)
D. J. Ampleford(34)
C. Deeney(33)
J. L. Giuliani(27)
Sandia National Laboratories, Albuquerque, NM, USA(86)
Ktech Corporation, Albuquerque, NM, USA(25)
Plasma Physics Division, Naval Research Laboratory, Inc., Washington D.C., DC, USA(16)
University of Nevada, Reno, NV, USA(11)
Naval Research Laboratory, Washington, DC, USA(9)
IEEE Transactions on Plasma Science(23)
2010 Abstracts IEEE International Conference on Plasma Science(10)
2007 IEEE 34th International Conference on Plasma Science (ICOPS)(9)
IEEE Conference Record - Abstracts. 2005 IEEE International Conference on Plasma Science(9)
2011 Abstracts IEEE International Conference on Plasma Science(8)
IEEE(118)
Albuquerque, NM, USA(10)
Norfolk, VA, USA(10)
Chicago, IL, USA(9)
Monterey, CA, USA(9)
San Diego, CA, USA(7)
Wire Array(42)
Sandia National Laboratories(31)
Nuclear Security(21)
Energy National(17)
National Nuclear Security Administration(17)

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Results

Continuum Hard-Photon K-Shell Yields From Z-Pinch Implosions: Present Status and Scaling to Higher Currents

Alexander L. Velikovich;Nicholas D. Ouart;Arati Dasgupta;John L. Giuliani;Varun Tangri;Adam J. Harvey-Thompson;Marc-Andre Schaeuble;Jens Schwarz;Clayton E. Myers;David J. Ampleford;Roger A. Vesey;Brent Jones

IEEE Transactions on Plasma Science

Year: 2024 | Volume: 52, Issue: 6 | Journal Article |

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The use of the recombination continuum for X-ray radiation production in Z-pinches is discussed as an option for generating high yields in the warm photon energy range,

$\hslash \omega \gt 10$ keV. The free-bound direct-recombination continuum emission is an inherently weaker radiation production mechanism than the resonant-line emission. However, it is challenging, if at all possible, to heat s...Show More

Continuum Hard-Photon K-Shell Yields From Z-Pinch Implosions: Present Status and Scaling to Higher Currents

Alexander L. Velikovich;Nicholas D. Ouart;Arati Dasgupta;John L. Giuliani;Varun Tangri;Adam J. Harvey-Thompson;Marc-Andre Schaeuble;Jens Schwarz;Clayton E. Myers;David J. Ampleford;Roger A. Vesey;Brent Jones

IEEE Transactions on Plasma Science

Year: 2024 | Volume: 52, Issue: 6 | Journal Article |

Domination of the K-Radiation at a Z-Pinch Stagnation on Z by Numerous Tiny Spots and the Properties of the Spots Inferred by Experimental Determination of the K-Line Opacities

Y. Maron;V. Bernshtam;Y. Zarnitsky;V. Fisher;O. Nedostup;D. J. Ampleford;C. A. Jennings;B. Jones;M. E. Cuneo;G. A. Rochau;G. S. Dunham;G. P. Loisel

2022 IEEE International Conference on Plasma Science (ICOPS)

Year: 2022 | Conference Paper |

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Detailed analysis of both the line-intensity ratios and line shapes of the K-lines of elements of different abundances (Fe, Cr, Ni, and Mn) emitted from the stagnation of a steel wire-array implosion on Z, were used to determine the line opacities. While the opacities at the early time of stagnation appear to be consistent with a nearly uniform hot-plasma cylinder on-axis surrounded by a colder an...Show More

Domination of the K-Radiation at a Z-Pinch Stagnation on Z by Numerous Tiny Spots and the Properties of the Spots Inferred by Experimental Determination of the K-Line Opacities

Y. Maron;V. Bernshtam;Y. Zarnitsky;V. Fisher;O. Nedostup;D. J. Ampleford;C. A. Jennings;B. Jones;M. E. Cuneo;G. A. Rochau;G. S. Dunham;G. P. Loisel

2022 IEEE International Conference on Plasma Science (ICOPS)

Year: 2022 | Conference Paper |

Scaling of Efficient ar K-Shell Emission From Fast Gas-Puff Z-Pinches in the 10 to 100 Ma Current Range

V. Tangri;J. L. Giuliani;A. Dasgupta;A. L. Velikovich;N. D. Ouart;M.-A. Schaeuble;J. Schwarz;D. J. Ampleford;R. Vesey;B. M. Jones

2022 IEEE International Conference on Plasma Science (ICOPS)

Year: 2022 | Conference Paper |

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Results of recent simulations of argon double-shell gas-puff Z-pinch implosions performed at NRL using MACH2-TCRE code in the efficient and inefficient regime are presented. This code was successfully used for modeling argon gas-puff implosions with various load configuration and diagnostic dopant options on Z facility. [1] , [2] Results presented will cover a large set of simulations in the high-...Show More

Scaling of Efficient ar K-Shell Emission From Fast Gas-Puff Z-Pinches in the 10 to 100 Ma Current Range

V. Tangri;J. L. Giuliani;A. Dasgupta;A. L. Velikovich;N. D. Ouart;M.-A. Schaeuble;J. Schwarz;D. J. Ampleford;R. Vesey;B. M. Jones

2022 IEEE International Conference on Plasma Science (ICOPS)

Year: 2022 | Conference Paper |

Bright-Spot Contributions to Hardphoton Continuum K-Shell Yield from Argon and Stainless-Steel Load Implosions on Z

A. L. Velikovich;N. D. Ouart;A. Dasgupta;J. L. Giuliani;V. Tangri;A. J. Harvey-Thompson;M.-A. Schaeuble;J. Schwarz;C. Myers;D. J. Ampleford;R. Vesey;B. M. Jones;Y. Maron

2022 IEEE International Conference on Plasma Science (ICOPS)

Year: 2022 | Conference Paper |

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In Z-pinch implosions, K-shell radiation often comes from isolated bright spots, whose density and/or temperature significantly differ from the background plasma parameters [1] - [3] . The prominence of bright spots in many radiating materials raises questions about the applicability of the analytical [4] and numerical predictions of K-shell yields that do not accurately describe small-scale radia...Show More

Bright-Spot Contributions to Hardphoton Continuum K-Shell Yield from Argon and Stainless-Steel Load Implosions on Z

A. L. Velikovich;N. D. Ouart;A. Dasgupta;J. L. Giuliani;V. Tangri;A. J. Harvey-Thompson;M.-A. Schaeuble;J. Schwarz;C. Myers;D. J. Ampleford;R. Vesey;B. M. Jones;Y. Maron

2022 IEEE International Conference on Plasma Science (ICOPS)

Year: 2022 | Conference Paper |

Time-Dependent Non-LTE Level Kinetics in 1-D MHD Simulations of an Argon Gas Puff Implosion

N. D. Ouart;A. Dasgupta;J. L. Giuliani;A. L. Velikovich;V. Tangri;M.-A. Schaeuble;J. Schwarz;D. J. Ampleford;R. Vesey;C. Jennings;B. M. Jones

2022 IEEE International Conference on Plasma Science (ICOPS)

Year: 2022 | Conference Paper |

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The Z machine has produced bright x-ray sources by imploding gas puff or wire array loads. A frequently fielded argon gas puff platform has a 1:1.6 outer-to-inner mass profile from an 8cm dia. nozzle, 1.0mg/cm mass, and a 2.5cm height. These experiments produce similar x-ray powers and K-shell yields >300 kJ [1] . The 2-D MHD Mach2+TCRE code reproduced the measured powers, yields, and emission reg...Show More

Time-Dependent Non-LTE Level Kinetics in 1-D MHD Simulations of an Argon Gas Puff Implosion

N. D. Ouart;A. Dasgupta;J. L. Giuliani;A. L. Velikovich;V. Tangri;M.-A. Schaeuble;J. Schwarz;D. J. Ampleford;R. Vesey;C. Jennings;B. M. Jones

2022 IEEE International Conference on Plasma Science (ICOPS)

Year: 2022 | Conference Paper |

Progress in the Refining of the K-Shell Yield Scaling Model for Z-Pinch Plasma Radiation Sources

A. Esaulov;A. L. Velikovich;V. Tangri;J. L. Giuliani;N. D. Ouart;A. Dasgupta;J. Schwarz;R. Vesey;D. J. Ampleford;M.-A. Schaeuble;B. M. Jones

2022 IEEE International Conference on Plasma Science (ICOPS)

Year: 2022 | Conference Paper |

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Analytical scaling models of K-shell radiation yield from the imploding Z-pinch plasma radiation sources (PRS) have been advanced at NRL. Those developed by Mosher-Krishnan-Qi, MKQ [1] , and Thornhill-Whitney-Giuliani, TWG [2] , are the best-known and most helpful. They predict the K-shell yield as a function of input parameters, such as load mass and the energy coupled to the radiating plasma. Th...Show More

Progress in the Refining of the K-Shell Yield Scaling Model for Z-Pinch Plasma Radiation Sources

A. Esaulov;A. L. Velikovich;V. Tangri;J. L. Giuliani;N. D. Ouart;A. Dasgupta;J. Schwarz;R. Vesey;D. J. Ampleford;M.-A. Schaeuble;B. M. Jones

2022 IEEE International Conference on Plasma Science (ICOPS)

Year: 2022 | Conference Paper |

Continuum Hard-Photon K-Shell Yields from Z-Pinch Implosions: Present Status and Scaling to Higher Currents

A. L. Velikovich;N. D. Ouart;A. Dasgupta;J. L. Giuliani;V. Tangri;A. J. Harvey-Thompson;M.-A. Schaeuble;J. Schwarz;C. E. Myers;D. J. Ampleford;R. A. Vesey;B. Jones

2021 IEEE International Conference on Plasma Science (ICOPS)

Year: 2021 | Conference Paper |

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The use of the recombination continuum for x-ray radiation production in Z pinches has been discussed as an option 1 for generating high yields in the warm photon energy range, ħω > 13 keV. The free-bound continuum emission is an inherently weaker radiation production mechanism than K-shell line emission. But it is challenging, if at all possible, to heat stagnated Z-pinch plasmas with atomic numb...Show More

Continuum Hard-Photon K-Shell Yields from Z-Pinch Implosions: Present Status and Scaling to Higher Currents

A. L. Velikovich;N. D. Ouart;A. Dasgupta;J. L. Giuliani;V. Tangri;A. J. Harvey-Thompson;M.-A. Schaeuble;J. Schwarz;C. E. Myers;D. J. Ampleford;R. A. Vesey;B. Jones

2021 IEEE International Conference on Plasma Science (ICOPS)

Year: 2021 | Conference Paper |

A model for K-shell x-ray yield from magnetic implosions at Sandia's Z machine

Jens Schwarz;Roger A. Vesey;David J. Ampleford;Marc-Andre Schaeuble;Brent Jones;Alexander L. Velikovich;John L. Giuliani;Varun Tangri;Nicholas D. Ouart;Arati Dasgupta

2021 IEEE International Conference on Plasma Science (ICOPS)

Year: 2021 | Conference Paper |

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A zero dimensional thin-shell implosion model with a coupled equivalent circuit for the description of an imploding nested wire array or gas puff is presented. Model results have been compared with data from imploding stainless-steel wire arrays and good agreement has been found.Show More

A model for K-shell x-ray yield from magnetic implosions at Sandia's Z machine

Jens Schwarz;Roger A. Vesey;David J. Ampleford;Marc-Andre Schaeuble;Brent Jones;Alexander L. Velikovich;John L. Giuliani;Varun Tangri;Nicholas D. Ouart;Arati Dasgupta

2021 IEEE International Conference on Plasma Science (ICOPS)

Year: 2021 | Conference Paper |

Investigation of CH foams doped with titanium as a cold x-ray source alternative

N.D. Ouart;A. Dasgupta;A.L. Velikovich;J.L Giuliani;V. Tangri;M.-A. Schaeuble;J. Schwarz;D. Ampleford;R.A. Vesey;B. Jones

2021 IEEE International Conference on Plasma Science (ICOPS)

Year: 2021 | Conference Paper |

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Implosions of wire array and gas puff loads on pulsed power facilities, such as the Z machine at Sandia National Laboratories, have been successful in producing 1-10 keV soft x-ray sources. Titanium wire array loads imploded on Z have produced ~100 kJ of 4.8 keV x-rays 1,2 . We present here medium- and high-atomic-number-material doped plastic foams as an alternative load concept for producing col...Show More

Investigation of CH foams doped with titanium as a cold x-ray source alternative

N.D. Ouart;A. Dasgupta;A.L. Velikovich;J.L Giuliani;V. Tangri;M.-A. Schaeuble;J. Schwarz;D. Ampleford;R.A. Vesey;B. Jones

2021 IEEE International Conference on Plasma Science (ICOPS)

Year: 2021 | Conference Paper |

Scaling of Efficient AR K-Shell Emission From Fast Gas-Puff Z-Pinches in the 10 to 100 MA Current Range

V. Tangri;J. L. Giuliani Voluntary Emeritus Program;A. Dasgupta;A. L. Velikovich;N. D. Ouart;M.-A. Schaeuble;J. Schwarz;D. J. Ampleford;R. A. Vesey;B. Jones

2021 IEEE International Conference on Plasma Science (ICOPS)

Year: 2021 | Conference Paper |

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Results of recent simulations of argon double-shell gas-puff Z-pinch implosions performed at NRL using MACH2-TCRE code are presented. This code was successfully used for modeling argon gas-puff implosions with various load configuration and diagnostic dopant options on Z facility. 1 , 2 The new effort has been focused on performing a large set of high-current (10 MA to 100 MA) simulations spanning...Show More

Scaling of Efficient AR K-Shell Emission From Fast Gas-Puff Z-Pinches in the 10 to 100 MA Current Range

V. Tangri;J. L. Giuliani Voluntary Emeritus Program;A. Dasgupta;A. L. Velikovich;N. D. Ouart;M.-A. Schaeuble;J. Schwarz;D. J. Ampleford;R. A. Vesey;B. Jones

2021 IEEE International Conference on Plasma Science (ICOPS)

Year: 2021 | Conference Paper |

Assessing Stagnation Conditions and Identifying Trends in Magnetized Liner Inertial Fusion

Matthew R. Gomez;Stephen A. Slutz;Patrick F. Knapp;Kelly D. Hahn;Matthew R. Weis;Eric C. Harding;Matthias Geissel;Jeffrey R. Fein;Michael E. Glinsky;Stephanie B. Hansen;Adam J. Harvey-Thompson;Christopher A. Jennings;Ian C. Smith;Daniel Woodbury;David J. Ampleford;Thomas J. Awe;Gordon A. Chandler;Mark H. Hess;Derek C. Lamppa;Clayton E. Myers;Carlos L. Ruiz;Adam B. Sefkow;Jens Schwarz;David A. Yager-Elorriaga;Brent Jones;John L. Porter;Kyle J. Peterson;Ryan D. Mcbride;Gregory A. Rochau;Daniel B. Sinars

IEEE Transactions on Plasma Science

Year: 2019 | Volume: 47, Issue: 5 | Journal Article |

Cited by: Papers (40)

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Magnetized Liner Inertial Fusion (MagLIF) is a magneto-inertial fusion concept, which is presently being studied on the Z Pulsed Power Facility. The concept utilizes an axial magnetic field and laser heating to produce fusion-relevant conditions at stagnation despite a peak magnetically driven implosion velocity of less than 100 km/s. Initial experiments demonstrated the viability of the concept b...Show More

Assessing Stagnation Conditions and Identifying Trends in Magnetized Liner Inertial Fusion

Matthew R. Gomez;Stephen A. Slutz;Patrick F. Knapp;Kelly D. Hahn;Matthew R. Weis;Eric C. Harding;Matthias Geissel;Jeffrey R. Fein;Michael E. Glinsky;Stephanie B. Hansen;Adam J. Harvey-Thompson;Christopher A. Jennings;Ian C. Smith;Daniel Woodbury;David J. Ampleford;Thomas J. Awe;Gordon A. Chandler;Mark H. Hess;Derek C. Lamppa;Clayton E. Myers;Carlos L. Ruiz;Adam B. Sefkow;Jens Schwarz;David A. Yager-Elorriaga;Brent Jones;John L. Porter;Kyle J. Peterson;Ryan D. Mcbride;Gregory A. Rochau;Daniel B. Sinars

IEEE Transactions on Plasma Science

Year: 2019 | Volume: 47, Issue: 5 | Journal Article |

Simulations of an Argon Z-Pinch Implosion with Time-Dependent Non-LTE Population Kinetics

N.D. Ouart;A. Dasgupta;J.L. Giuliani;B. Jones;D.J. Ampleford;A. Harvey-Thompson;C. Jennings;R.W. Clark;V. Tangri

2018 IEEE International Conference on Plasma Science (ICOPS)

Year: 2018 | Conference Paper |

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Three argon gas-puff implosions were performed on the Z-machine at Sandia National Laboratories. These three loads had the same density profile from an 8 cm diameter nozzle, a 1 mg/cm mass, and had a 2.5 cm length. The experiments produced similar K-shell radiative power pulses and yields [1]. Simulations with the 2-D Radiation MHD code Mach2 were able to reproduce the experimental K-shell powers,...Show More

Simulations of an Argon Z-Pinch Implosion with Time-Dependent Non-LTE Population Kinetics

N.D. Ouart;A. Dasgupta;J.L. Giuliani;B. Jones;D.J. Ampleford;A. Harvey-Thompson;C. Jennings;R.W. Clark;V. Tangri

2018 IEEE International Conference on Plasma Science (ICOPS)

Year: 2018 | Conference Paper |

Simulations of Recent Argon Gas-Puff Implosions on Z With Xe and Kr Dopants

Varun Tangri;John L. Giuliani;Alexander L. Velikovich;Nicholas Ouart;Arati Dasgupta;John P. Apruzese;A. J. Harvey-Thompson;C. A. Jennings;Brent Jones

IEEE Transactions on Plasma Science

Year: 2018 | Volume: 46, Issue: 11 | Journal Article |

Cited by: Papers (3)

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An intriguing result is that a small fraction of Xe (0.8% by number in the center jet) can have a significant impact on the emitted K-shell radiation in an Ar gas-puff implosion. This result was recently obtained from a pair of experiments on Sandia National Laboratories Z machine. These shots were Z2603 (with Xe) and Z2605 (without Xe). The pair had similar initial density profiles (outer shell, ...Show More

Simulations of Recent Argon Gas-Puff Implosions on Z With Xe and Kr Dopants

Varun Tangri;John L. Giuliani;Alexander L. Velikovich;Nicholas Ouart;Arati Dasgupta;John P. Apruzese;A. J. Harvey-Thompson;C. A. Jennings;Brent Jones

IEEE Transactions on Plasma Science

Year: 2018 | Volume: 46, Issue: 11 | Journal Article |

Simulations of Gas Puff Z-Pinch Implosions With a Xe Dopant

V. Tangri;J.L. Giuliani;A.L. Velikovich;N.D. Ouart;A. Dasgupta;J.P. Apruzese;A. J. Harvey-Thompson;C.A. Jennings;B. Jones

2017 IEEE International Conference on Plasma Science (ICOPS)

Year: 2017 | Conference Paper |

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Results from a pair of recent experiments 1 on Sandia National Laboratories’ Z machine have shown that the presence of a small fraction of Xe (0.8% by number in the center jet) in an Ar gas puff shot can have a significant impact on the emitted K-shell radiation. This pair consisted of shots with similar initial density profile (outer shell, inner shell, and center jet) but one with Xe dopant in t...Show More

Simulations of Gas Puff Z-Pinch Implosions With a Xe Dopant

V. Tangri;J.L. Giuliani;A.L. Velikovich;N.D. Ouart;A. Dasgupta;J.P. Apruzese;A. J. Harvey-Thompson;C.A. Jennings;B. Jones

2017 IEEE International Conference on Plasma Science (ICOPS)

Year: 2017 | Conference Paper |

Conceptual design of a 960-TW accelerator powered by impedance-matched Marx generators

W. Stygar;K. Austin;T. Awe;J. Bailey;E. Breden;G. Brent;J. Calhoun;M. Campbell;R. Clark;R. Cooper;M. Cuneo;J. Edwards;J. Ennis;R. Gilgenbach;M. Gomez;P. Gourdain;G. Greiser;F. Gruner;J. Hammer;M. Herrmann;M. Hess;B. Hutsel;C. Jennings;D. Jobe;O. Johns;B. Jones;M. Jones;P. Jones;K. Keilholtz;P. Knapp;G. Laity;D. Lamppa;K. LeChien;J. Leckbee;S. Lewis;D. Lucero;M. Martin;K.K. Matzen;M. Mazarakis;R. McBride;R. McKee;J. Moore;C. Mostrom;T. Mulville;D. Muron;K. Peterson;D. Pilkington;J. Porter;K. Raman;G. Rochau;D. Rose;M. Savage;M. Sceiford;P. Schmit;R. Schneider;D. Sinars;S. Slutz;R. Spielman;B. Stoltzfus;C. Verdon;R. Vesey;E. Waisman;E. Weinbrecht;D. Welch;M. Wisher

2017 IEEE 21st International Conference on Pulsed Power (PPC)

Year: 2017 | Conference Paper |

Cited by: Papers (8)

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We have developed a conceptual design of a next-generation pulsed-power accelerator that is optimized for advanced high-energy-density-physics experiments. The prime power source of the machine consists of 210 impedance-matched Marx generators (IMGs). Each IMG drives a 150-ns-long coaxial-transmission-line impedance transformer. The coaxial lines provide a minimum of 300 ns of transit-time isolati...Show More

Conceptual design of a 960-TW accelerator powered by impedance-matched Marx generators

W. Stygar;K. Austin;T. Awe;J. Bailey;E. Breden;G. Brent;J. Calhoun;M. Campbell;R. Clark;R. Cooper;M. Cuneo;J. Edwards;J. Ennis;R. Gilgenbach;M. Gomez;P. Gourdain;G. Greiser;F. Gruner;J. Hammer;M. Herrmann;M. Hess;B. Hutsel;C. Jennings;D. Jobe;O. Johns;B. Jones;M. Jones;P. Jones;K. Keilholtz;P. Knapp;G. Laity;D. Lamppa;K. LeChien;J. Leckbee;S. Lewis;D. Lucero;M. Martin;K.K. Matzen;M. Mazarakis;R. McBride;R. McKee;J. Moore;C. Mostrom;T. Mulville;D. Muron;K. Peterson;D. Pilkington;J. Porter;K. Raman;G. Rochau;D. Rose;M. Savage;M. Sceiford;P. Schmit;R. Schneider;D. Sinars;S. Slutz;R. Spielman;B. Stoltzfus;C. Verdon;R. Vesey;E. Waisman;E. Weinbrecht;D. Welch;M. Wisher

2017 IEEE 21st International Conference on Pulsed Power (PPC)

Year: 2017 | Conference Paper |

Effects of a Xe dopant on an Ar gas-puff implosion on Z

J. P. Apruzese;J. L. Giuliani;N. D. Ouart;V. Tangri;A. J. Harvey-Thompson;B. Jones;C. A. Jennings

2016 IEEE International Conference on Plasma Science (ICOPS)

Year: 2016 | Conference Paper |

Two Ar gas-puff experiments, each using loads consisting of two annuli and a center jet, were recently performed on Sandia National Laboratories' Z machine. These shots had the same load except that one of them (Z2603) employed a Xe dopant of 0.8% by number in the jet, which was not present in the otherwise identical Z2605. The extensive diagnostics deployed in these experiments reveal that the pr...Show More

Effects of a Xe dopant on an Ar gas-puff implosion on Z

J. P. Apruzese;J. L. Giuliani;N. D. Ouart;V. Tangri;A. J. Harvey-Thompson;B. Jones;C. A. Jennings

2016 IEEE International Conference on Plasma Science (ICOPS)

Year: 2016 | Conference Paper |

Investigating Radial Wire Array $Z$ -Pinches as a Compact X-Ray Source on the Saturn Generator

David J. Ampleford;Simon N. Bland;Christopher A. Jennings;Sergey V. Lebedev;Jeremy P. Chittenden;Ryan D. McBride;Brent Jones;Jason D. Serrano;Michael E. Cuneo;Gareth N. Hall;Francisco Suzuki-Vidal;Simon C. Bott-Suzuki

IEEE Transactions on Plasma Science

Year: 2015 | Volume: 43, Issue: 9 | Journal Article |

Cited by: Papers (1)

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Radial wire array Z-pinches, where wires are positioned radially outward from a central cathode to a concentric anode, can act as a compact bright X-ray source that could potentially be used to drive a hohlraum. Experiments were performed on the 7-MA Saturn generator using radial wire arrays. These experiments studied a number of potential risks in scaling radial wire arrays up from the 1-MA level...Show More

Investigating Radial Wire Array $Z$ -Pinches as a Compact X-Ray Source on the Saturn Generator

David J. Ampleford;Simon N. Bland;Christopher A. Jennings;Sergey V. Lebedev;Jeremy P. Chittenden;Ryan D. McBride;Brent Jones;Jason D. Serrano;Michael E. Cuneo;Gareth N. Hall;Francisco Suzuki-Vidal;Simon C. Bott-Suzuki

IEEE Transactions on Plasma Science

Year: 2015 | Volume: 43, Issue: 9 | Journal Article |

Double and single planar wire arrays at high and low impedance university-scale generators

A. S. Safronova;V. L. Kantsyrev;M. E. Weller;V. V. Shlyaptseva;I. Shrestha;A. Stafford;M. Lorance;M. Cooper;S. G. Patel;A. M. Steiner;D. A. Yager-Elorriaga;N. M. Jordan;R. M. Gilgenbach;C. A. Coverdale;B. Jones;K. M. Williamson;A. S. Chuvatin

2015 IEEE International Conference on Plasma Sciences (ICOPS)

Year: 2015 | Conference Paper |

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Single Planar Wire Arrays (SPWA) and Double Planar Wire Arrays (DPWA), which consist of one or two parallel rows of wires, respectively, have demonstrated high radiation efficiency (up to 30 kJ), compact size (1.5-3 mm), and usefulness for various applications in experiments on the high-impedance Zebra (1.9Ω, 1 MA, 100 ns). For example, DPWAs are very suitable for the new compact multi-source hohl...Show More

Double and single planar wire arrays at high and low impedance university-scale generators

A. S. Safronova;V. L. Kantsyrev;M. E. Weller;V. V. Shlyaptseva;I. Shrestha;A. Stafford;M. Lorance;M. Cooper;S. G. Patel;A. M. Steiner;D. A. Yager-Elorriaga;N. M. Jordan;R. M. Gilgenbach;C. A. Coverdale;B. Jones;K. M. Williamson;A. S. Chuvatin

2015 IEEE International Conference on Plasma Sciences (ICOPS)

Year: 2015 | Conference Paper |

2-D RMHD Modeling Assessment of Current Flow, Plasma Conditions, and Doppler Effects in Recent Z Argon Experiments

J. Ward Thornhill;John L. Giuliani;Brent Jones;John P. Apruzese;Arati Dasgupta;Young K. Chong;Adam J. Harvey-Thompson;David J. Ampleford;Stephanie B. Hansen;Christine A. Coverdale;Christopher A. Jennings;Gregory A. Rochau;Michael E. Cuneo;Derek C. Lamppa;Drew Johnson;Michael C. Jones;Nathan W. Moore;Eduardo M. Waisman;Mahadevan Krishnan;Philip L. Coleman

IEEE Transactions on Plasma Science

Year: 2015 | Volume: 43, Issue: 8 | Journal Article |

Cited by: Papers (8)

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By varying current-loss circuit parameters, the Mach2-tabular collisional radiative equilibrium 2-D radiation magnetohydrodynamic model was tuned to reproduce the radiative and electrical properties of three recent argon gas-puff experiments (same initial conditions) performed on the Z machine at Sandia National Laboratories. The model indicates that there were current losses occurring near or wit...Show More

2-D RMHD Modeling Assessment of Current Flow, Plasma Conditions, and Doppler Effects in Recent Z Argon Experiments

J. Ward Thornhill;John L. Giuliani;Brent Jones;John P. Apruzese;Arati Dasgupta;Young K. Chong;Adam J. Harvey-Thompson;David J. Ampleford;Stephanie B. Hansen;Christine A. Coverdale;Christopher A. Jennings;Gregory A. Rochau;Michael E. Cuneo;Derek C. Lamppa;Drew Johnson;Michael C. Jones;Nathan W. Moore;Eduardo M. Waisman;Mahadevan Krishnan;Philip L. Coleman

IEEE Transactions on Plasma Science

Year: 2015 | Volume: 43, Issue: 8 | Journal Article |

Wire-Array Z-Pinch Length Variations for K-Shell X-Ray Generation on Z

Brent Jones;David J. Ampleford;Christopher A. Jennings;Eduardo M. Waisman;Stephanie B. Hansen;Christine A. Coverdale;Michael E. Cuneo;John P. Apruzese;J. Ward Thornhill;John L. Giuliani;Arati Dasgupta;Robert W. Clark;Jack Davis

IEEE Transactions on Plasma Science

Year: 2015 | Volume: 43, Issue: 8 | Journal Article |

Cited by: Papers (3)

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In developing stainless-steel (SS) and copper wire-array X-ray sources on the Z machine, we consider the optimization of K-shell yield as a function of load height. Theory, numerical modeling, and experimental data suggest that an optimum exists corresponding to a tradeoff between the increase in radiating mass and the decrease in coupled current with increasing pinch height. A typical load height...Show More

Wire-Array Z-Pinch Length Variations for K-Shell X-Ray Generation on Z

Brent Jones;David J. Ampleford;Christopher A. Jennings;Eduardo M. Waisman;Stephanie B. Hansen;Christine A. Coverdale;Michael E. Cuneo;John P. Apruzese;J. Ward Thornhill;John L. Giuliani;Arati Dasgupta;Robert W. Clark;Jack Davis

IEEE Transactions on Plasma Science

Year: 2015 | Volume: 43, Issue: 8 | Journal Article |

Synthetic time and space resolved spectra including doppler splitting from simulations of stainless steel and argon pinches on Z

J. W. Thornhill;J. L. Giuliani;J. P. Apruzese;A. Dasgupta;Y. K Chong;B. Jones;D. J. Ampleford;A. J. Harvey-Thompson;S. B. Hansen;C. A. Coverdale;C. A. Jennings;G. A. Rochau;M. E. Cuneo

2014 IEEE 41st International Conference on Plasma Sciences (ICOPS) held with 2014 IEEE International Conference on High-Power Particle Beams (BEAMS)

Year: 2014 | Conference Paper |

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A two-dimensional radiation MHD model that includes a self-consistent calculation for non-local thermodynamic equilibrium kinetics and ray-trace radiation transport1 is employed to simulate 65 mm diameter stainless steel double wire array Z machine experiments of 5.0 mg - shot Z1859 and 2.5 mg - shot Z1860 as well as 8 cm diameter, 2.5 mg, argon gas-puff experiments, shots Z2259 - Z2261. Temporal ...Show More

Synthetic time and space resolved spectra including doppler splitting from simulations of stainless steel and argon pinches on Z

J. W. Thornhill;J. L. Giuliani;J. P. Apruzese;A. Dasgupta;Y. K Chong;B. Jones;D. J. Ampleford;A. J. Harvey-Thompson;S. B. Hansen;C. A. Coverdale;C. A. Jennings;G. A. Rochau;M. E. Cuneo

2014 IEEE 41st International Conference on Plasma Sciences (ICOPS) held with 2014 IEEE International Conference on High-Power Particle Beams (BEAMS)

Year: 2014 | Conference Paper |

Double planar wire arrays at enhanced current on Zebra

A.S. Safronova;V.L. Kantsyrev;I. Shrestha;M.E. Weller;V.V. Shlyaptseva;A. Stafford;M. Lorance;A.A. Esaulov;A.S. Chuvatin;C.A. Coverdale;B. Jones;D.J. Ampleford

2014 IEEE 41st International Conference on Plasma Sciences (ICOPS) held with 2014 IEEE International Conference on High-Power Particle Beams (BEAMS)

Year: 2014 | Conference Paper |

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Double Planar Wire Arrays (DPWA), which consist of two parallel rows of wires, have demonstrated high radiation efficiency (up to 30 kJ), compact size (1.5-3 mm), and pulse shaping capabilities in experiments at 1 MA Zebra. DPWAs are also very suitable for the new compact multi-source hohlraum concept. It was shown that their implosion dynamics strongly depends on the critical load parameter, the ...Show More

Double planar wire arrays at enhanced current on Zebra

A.S. Safronova;V.L. Kantsyrev;I. Shrestha;M.E. Weller;V.V. Shlyaptseva;A. Stafford;M. Lorance;A.A. Esaulov;A.S. Chuvatin;C.A. Coverdale;B. Jones;D.J. Ampleford

2014 IEEE 41st International Conference on Plasma Sciences (ICOPS) held with 2014 IEEE International Conference on High-Power Particle Beams (BEAMS)

Year: 2014 | Conference Paper |

Scaling and enhancement of non-thermal line emission on z to hν ∼ 22 kev

D.J. Ampleford;S.B. Hansen;C.A. Jennings;B. Jones;T.C. Webb;V. Harper-Slaboszewicz;M.E. Cuneo;G.A. Rochau;C.A. Coverdale;A.J. Harvey-Thompson;D.B. Sinars;J.K. Moore;T.M. Flanagan;N. Ouart;A. Dasgupta;J. Giuliani;A.L. Velikovich;J.P. Apruzese;J.P. Chittenden;N. Niasse;B. Appelbe

2014 IEEE 41st International Conference on Plasma Sciences (ICOPS) held with 2014 IEEE International Conference on High-Power Particle Beams (BEAMS)

Year: 2014 | Conference Paper |

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We report on experiments demonstrating the transition from thermally-dominated K-shell line emission to non-thermal, hot-electron-driven inner-shell emission for z pinch plasmas on the Z machine. We find preferential scaling of non-thermal line emission for atomic number Z=42 and higher (hν ≥ 17keV). Initial experiments with Mo (Z=42) and Ag (Z=47) have produced kJ-level emission in the 17-keV and...Show More

Scaling and enhancement of non-thermal line emission on z to hν ∼ 22 kev

D.J. Ampleford;S.B. Hansen;C.A. Jennings;B. Jones;T.C. Webb;V. Harper-Slaboszewicz;M.E. Cuneo;G.A. Rochau;C.A. Coverdale;A.J. Harvey-Thompson;D.B. Sinars;J.K. Moore;T.M. Flanagan;N. Ouart;A. Dasgupta;J. Giuliani;A.L. Velikovich;J.P. Apruzese;J.P. Chittenden;N. Niasse;B. Appelbe

2014 IEEE 41st International Conference on Plasma Sciences (ICOPS) held with 2014 IEEE International Conference on High-Power Particle Beams (BEAMS)

Year: 2014 | Conference Paper |

The effect of adding a center jet to Argon gas puff implosions at the Z facility

A.J. Harvey-Thompson;B. Jones;C.A. Jennings;D.J. Ampleford;D.C. Lamppa;S.B. Hansen;C.A. Coverdale;M.R. Gomez;G.A. Rochau;D. Johnson;M.C. Jones;N.W. Moore;T. Flanagan;J. Reneker;M. Jobe;L. Lucero;M.E. Cuneo;J.W. Thornhill;J.L. Giuliani;A. Dasgupta

2014 IEEE 41st International Conference on Plasma Sciences (ICOPS) held with 2014 IEEE International Conference on High-Power Particle Beams (BEAMS)

Year: 2014 | Conference Paper |

Cited by: Papers (2)

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Argon gas puff implosions have been found to be an extremely efficient source of K-shell x-rays (3-4 keV) on the Z pulsed power facility at Sandia National Labs. producing over 300 kJ of K-shell emission in double-shell experiments. Experiments at Double Eagle [1] and Saturn [2] have previously found that adding a central jet of mass to their double-shell gas puff configurations increased the yiel...Show More

The effect of adding a center jet to Argon gas puff implosions at the Z facility

A.J. Harvey-Thompson;B. Jones;C.A. Jennings;D.J. Ampleford;D.C. Lamppa;S.B. Hansen;C.A. Coverdale;M.R. Gomez;G.A. Rochau;D. Johnson;M.C. Jones;N.W. Moore;T. Flanagan;J. Reneker;M. Jobe;L. Lucero;M.E. Cuneo;J.W. Thornhill;J.L. Giuliani;A. Dasgupta

2014 IEEE 41st International Conference on Plasma Sciences (ICOPS) held with 2014 IEEE International Conference on High-Power Particle Beams (BEAMS)

Year: 2014 | Conference Paper |

A Renewed Capability for Gas Puff Science on Sandia's Z Machine

Brent Jones;Christopher A. Jennings;Derek C. Lamppa;Stephanie B. Hansen;Adam J. Harvey-Thompson;David J. Ampleford;Michael E. Cuneo;Thomas Strizic;Drew Johnson;Michael C. Jones;Nathan W. Moore;Timothy M. Flanagan;John L. McKenney;Eduardo M. Waisman;Christine A. Coverdale;Mahadevan Krishnan;Philip L. Coleman;Kristi Wilson Elliott;Robert E. Madden;John Thompson;Alex Bixler;J. Ward Thornhill;John L. Giuliani;Young K. Chong;Alexander L. Velikovich;Arati Dasgupta;John P. Apruzese

IEEE Transactions on Plasma Science

Year: 2014 | Volume: 42, Issue: 5 | Journal Article |

Cited by: Papers (27)

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A comprehensive gas puff capability is being developed on the Z pulsed power generator. We describe the methodology employed for developing a gas puff load on Z, which combines characterization and modeling of the neutral gas mass flow from a supersonic nozzle, numerical modeling of the implosion of this mass profile, and experimental evaluation of these magnetic implosions on Z. We are beginning ...Show More

A Renewed Capability for Gas Puff Science on Sandia's Z Machine

Brent Jones;Christopher A. Jennings;Derek C. Lamppa;Stephanie B. Hansen;Adam J. Harvey-Thompson;David J. Ampleford;Michael E. Cuneo;Thomas Strizic;Drew Johnson;Michael C. Jones;Nathan W. Moore;Timothy M. Flanagan;John L. McKenney;Eduardo M. Waisman;Christine A. Coverdale;Mahadevan Krishnan;Philip L. Coleman;Kristi Wilson Elliott;Robert E. Madden;John Thompson;Alex Bixler;J. Ward Thornhill;John L. Giuliani;Young K. Chong;Alexander L. Velikovich;Arati Dasgupta;John P. Apruzese

IEEE Transactions on Plasma Science

Year: 2014 | Volume: 42, Issue: 5 | Journal Article |

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