Mid-Atomic-Number Cylindrical Wire Array Precursor Plasma Studies on Zebra

Stafford, A; Safronova, A. S.; Kantsyrev, V. L.; Coverdale, Christine Anne; Weller, M. E.; Shrestha, I.; Shlyaptseva, V. V.; Chuvatin, A. S.

doi:10.1109/TPS.2014.2382072

Title: Mid-Atomic-Number Cylindrical Wire Array Precursor Plasma Studies on Zebra

Full Record
Other Related Research

Abstract

The precursor plasmas from low wire number cylindrical wire arrays (CWAs) were previously shown to radiate at temperatures >300 eV for Ni-60 (94% Cu and 6% Ni) wires in experiments on the 1-MA Zebra generator. Continued research into precursor plasmas has studied additional midatomic-number materials including Cu and Alumel (95% Ni, 2% Al, 2% Mn, and 1% Si) to determine if the >300 eV temperatures are common for midatomic-number materials. Additionally, current scaling effects were observed by performing CWA precursor experiments at an increased current of 1.5 MA using a load current multiplier. Our results show an increase in a linear radiation yield of ~50% (16 versus 10 kJ/cm) for the experiments at increased current. However, plasma conditions inferred through the modeling of X-ray time-gated spectra are very similar for the precursor plasma in both current conditions.

Authors:

Stafford, A ^[1]; Safronova, A. S. ^[1]; Kantsyrev, V. L. ^[1]; Coverdale, Christine Anne ^[2]; Weller, M. E. ^[1]; Shrestha, I. ^[1]; Shlyaptseva, V. V. ^[1]; Chuvatin, A. S. ^[3]

Univ. of Nevada, Reno, NV (United States)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Ecole Polytechnique (France)

Publication Date:: Tue Dec 30 00:00:00 EST 2014

Research Org.:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States

Sponsoring Org.:: USDOE National Nuclear Security Administration (NNSA)

OSTI Identifier:: 1184459

Report Number(s):: SAND-2014-18312J
Journal ID: ISSN 0093-3813; 537888

Grant/Contract Number:: AC04-94AL85000

Resource Type:: Accepted Manuscript

Journal Name:: IEEE Transactions on Plasma Science

Additional Journal Information:: Journal Volume: 43; Journal Issue: 8; Journal ID: ISSN 0093-3813

Publisher:: IEEE

Country of Publication:: United States

Language:: English

Subject:: 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; kinetic modeling; wire array; x-ray spectra; Z-pinch

Citation Formats


                    Stafford, A, Safronova, A. S., Kantsyrev, V. L., Coverdale, Christine Anne, Weller, M. E., Shrestha, I., Shlyaptseva, V. V., and Chuvatin, A. S. Mid-Atomic-Number Cylindrical Wire Array Precursor Plasma Studies on Zebra.  United States: N. p., 2014. 
Web.  doi:10.1109/TPS.2014.2382072.

Copy to clipboard


                    Stafford, A, Safronova, A. S., Kantsyrev, V. L., Coverdale, Christine Anne, Weller, M. E., Shrestha, I., Shlyaptseva, V. V., & Chuvatin, A. S. Mid-Atomic-Number Cylindrical Wire Array Precursor Plasma Studies on Zebra.  United States.  https://doi.org/10.1109/TPS.2014.2382072

Copy to clipboard


                    Stafford, A, Safronova, A. S., Kantsyrev, V. L., Coverdale, Christine Anne, Weller, M. E., Shrestha, I., Shlyaptseva, V. V., and Chuvatin, A. S. Tue .  
"Mid-Atomic-Number Cylindrical Wire Array Precursor Plasma Studies on Zebra".  United States.  https://doi.org/10.1109/TPS.2014.2382072.  https://www.osti.gov/servlets/purl/1184459.

Copy to clipboard


                    
@article{osti_1184459,

  title        = {Mid-Atomic-Number Cylindrical Wire Array Precursor Plasma Studies on Zebra},

  author       = {Stafford, A and Safronova, A. S. and Kantsyrev, V. L. and Coverdale, Christine Anne and Weller, M. E. and Shrestha, I. and Shlyaptseva, V. V. and Chuvatin, A. S.},

  abstractNote = {The precursor plasmas from low wire number cylindrical wire arrays (CWAs) were previously shown to radiate at temperatures >300 eV for Ni-60 (94% Cu and 6% Ni) wires in experiments on the 1-MA Zebra generator. Continued research into precursor plasmas has studied additional midatomic-number materials including Cu and Alumel (95% Ni, 2% Al, 2% Mn, and 1% Si) to determine if the >300 eV temperatures are common for midatomic-number materials. Additionally, current scaling effects were observed by performing CWA precursor experiments at an increased current of 1.5 MA using a load current multiplier. Our results show an increase in a linear radiation yield of ~50% (16 versus 10 kJ/cm) for the experiments at increased current. However, plasma conditions inferred through the modeling of X-ray time-gated spectra are very similar for the precursor plasma in both current conditions.},

  doi          = {10.1109/TPS.2014.2382072},

  journal      = {IEEE Transactions on Plasma Science},

  number       = 8,

  volume       = 43,

  place        = {United States},

  year         = {Tue Dec 30 00:00:00 EST 2014},

  month        = {Tue Dec 30 00:00:00 EST 2014}

}

Copy to clipboard

Journal Article:

Free Publicly Available Full Text

Accepted Manuscript (DOE)

Publisher's Version of Record

https://doi.org/10.1109/TPS.2014.2382072

Other availability

Search WorldCat to find libraries that may hold this journal

Save / Share:

Export Metadata

Save to My Library

Similar Records in DOE PAGES and OSTI.GOV collections:

Observation of >400-eV Precursor Plasmas from Low-Wire-Number Copper Arrays at the 1-MA Zebra Facility

Journal Article Coverdale, C A ; Ampleford, D J ; Jones, B ; ... - Physical Review Letters

Experiments with cylindrical copper wire arrays at the 1-MA Zebra facility show that high temperatures exist in the precursor plasmas formed when ablated wire array material accretes on the axis prior to the stagnation of a z pinch. In these experiments, the precursor radiated approximately 20% of the >1000 eV x-ray output, and time-resolved spectra show substantial emission from Cu L-shell lines. Modeling of the spectra shows an increase in temperature as the precursor forms, up to {approx}450 eV, after which the temperature decreases to {approx}220-320 eV until the main implosion.
https://doi.org/10.1103/PHYSREVLETT.102.155006
First analysis of radiative properties of moderate-atomic-number planar wire arrays on Zebra at UNR at higher current of 1.7 MA.

Conference Keim, S F ; Chuvatin, Alexander S ; Osborne, Glenn C ; ...

The analysis of implosions of Cu and Ag planar wire array (PWA) loads recently performed at the enhanced 1.7 MA Zebra generator at UNR is presented. Experiments were performed with a Load Current Multiplier with a 1cm anode-cathode gap (twice shorter than in a standard 1 MA mode). A full diagnostic set included more than ten different beam-lines with the major focus on time-gated and time-integrated x-ray imaging and spectra, total radiation yields, and fast, filtered x-ray detector data. In particular, the experimental results for a double PWA load consisting of twelve 10 {micro}m Cu wires in each row (totalmore »« less
Models of radiation yield from wire array implosion at 1 MA Zebra generator

Journal Article Esaulov, Andrey - Physics of Plasmas

The snowplow and thin shell models that have the analytical solutions in zero dimensions are linked with the ideal magnetohydrodynamic (MHD) and radiation MHD codes to calculate the radiation yield from the imploding wire array loads at 1 MA Zebra generator. Radiation MHD simulations show that the strong radiation cooling affects plasma dynamics at all stages of the implosion and drives plasma into the radiative collapse at the final stage of the implosion. Being applied to the implosion of an Al wire array with the mass per unit length 3.82 {mu}g/mm, these simulations show that the thermalization of the kineticmore »« less
https://doi.org/10.1063/1.2192754
Larger sized wire arrays on 1.5 MA Z-pinch generator

Journal Article Safronova, A. S., E-mail: alla@unr.edu ; Kantsyrev, V. L., E-mail: alla@unr.edu ; Weller, M. E., E-mail: alla@unr.edu ; ... - AIP Conference Proceedings

Experiments on the UNR Zebra generator with Load Current Multiplier (LCM) allow for implosions of larger sized wire array loads than at standard current of 1 MA. Advantages of larger sized planar wire array implosions include enhanced energy coupling to plasmas, better diagnostic access to observable plasma regions, and more complex geometries of the wire loads. The experiments with larger sized wire arrays were performed on 1.5 MA Zebra with LCM (the anode-cathode gap was 1 cm, which is half the gap used in the standard mode). In particular, larger sized multi-planar wire arrays had two outer wire planes frommore »« less
https://doi.org/10.1063/1.4904791
Effect of current prepulse on wire array initiation on the 1-MA ZEBRA accelerator

Journal Article Sarkisov, G S ; Rosenthal, S E ; Struve, K W ; ... - Physics of Plasmas

Experiments on the 1-MA ZEBRA accelerator with reduced current prepulse duration, using a flashover switch, demonstrate a significant increase of initial energy deposition into the tungsten wire array before breakdown, and of total radiation energy from the Z pinch. Shorter current prepulse raises the current rate through each individual wire in the array and results in an increase of the energy deposition into wire cores before breakdown. In our experiments, the inferred tungsten wire temperature increases from {approx}800 K (with 250 ns prepulse) up to {approx}3700 K (with 60 ns prepulse). Total radiation energy increases from 12 to 16 kJ.more »« less
https://doi.org/10.1063/1.2734575

Similar Records