Radiative Properties of Implosions of Stainless Steel Wire Arrays with Application to Astrophysics

Safronova, A.S.; Ouart, N. D.; Kantsyrev, V.L.; Esaulov, A. A.; Safronova, U. I.; Williamson, K.; Shrestha, I.; Coverdale, C. A.; Deeney, C.

doi:10.1063/1.3079711

Cited by 5 publications

(4 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Mo model was developed previously to diagnose experimental X-ray L-shell Mo spectra from 1MA UNR Zebra [16,17,10,12] and later was applied to the 470 kA Cornell XP X-pinches [17,18,11,12] as well as to the 20 MA SNL-Z wire arrays [7,8,17]. The Mg and Al models were developed to describe K-shell radiation from implosions from X-pinches and wire arrays with Al 5056 wires [13].…”

Section: Modeling Of Line Radiation From the Combined Al And Mo X-pinmentioning

confidence: 99%

“…Combined X-pinches are expected to be a good source for studying radiative properties of Z-pinch plasmas of very small sizes (100-mm-scale), high densities and temperatures as are usual for X-pinches but consist of the wires from different materials and hence may express different radiative properties [9,10]. Recently, combined X-pinches with Mo and W wires were studied for the first time and they have shown advantages in their applications for M-shell W diagnostics [11,12].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Radiative properties of implosions of combined X-pinches and planar wire arrays composed from different wire materials on the UNR 1 MA Z-pinch generator

Safronova

Kantsyrev

Yilmaz

et al. 2007

High Energy Density Physics

Self Cite

View full text Add to dashboard Cite

Section: Modeling Of Line Radiation From the Combined Al And Mo X-pinmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Radiative properties of implosions of combined X-pinches and planar wire arrays composed from different wire materials on the UNR 1 MA Z-pinch generator

Safronova

Kantsyrev

Yilmaz

et al. 2007

High Energy Density Physics

Self Cite

View full text Add to dashboard Cite

“…Non-LTE kinetic modeling in the manner of Ref. [51] is presently being carried out by A. S. Safronova (University of Nevada, Reno) to interpret these data and infer plasma conditions in the stagnated plasma. This analysis may confirm that suitable temperatures were obtained for ionization to the K-shell, and the Saturn short and long pulse experiments can be compared along with Zebra Al planar wire array data.…”

Section: Aluminum K-shell Radiation From a Planar Wire Arraymentioning

confidence: 99%

Compact wire array sources: power scaling and implosion physics.

Serrano¹,

Chuvatin

Jones³

et al. 2008

View full text Add to dashboard Cite

A series of ten shots were performed on the Saturn generator in short pulse mode in order to study planar and small-diameter cylindrical tungsten wire arrays at ∼5 MA current levels and 50-60 ns implosion times as candidates for compact z-pinch radiation sources. A new vacuum hohlraum configuration has been proposed in which multiple z pinches are driven in parallel by a pulsed power generator. Each pinch resides in a separate return current cage, serving also as a primary hohlraum. A collection of such radiation sources surround a compact secondary hohlraum, which may potentially provide an attractive Planckian radiation source or house an inertial confinement fusion fuel capsule. Prior to studying this concept experimentally or numerically, advanced compact wire array loads must be developed and their scaling behavior understood. The 2008 Saturn planar array experiments extend the data set presented in Ref.[1], which studied planar arrays at ∼3 MA, 100 ns in Saturn long pulse mode. Planar wire array power and yield scaling studies now include current levels directly applicable to multi-pinch experiments that could be performed on the 25 MA Z machine. A maximum total x-ray power of 15 TW (250 kJ in the main pulse, 330 kJ total yield) was observed with a 12-mm-wide planar array at 5.3 MA, 52 ns. The full data set indicates power scaling that is sub-quadratic with load current, while total and main pulse yields are closer to quadratic; these trends are similar to observations of compact cylindrical tungsten arrays on Z. We continue the investigation of energy coupling in these short pulse Saturn experiments using zero-dimensional-type implosion modeling and pinhole imaging, indicating 16 cm/μs implosion velocity in a 12-mm-wide array. The same phenomena of significant trailing mass and evidence for resistive heating are observed at 5 MA as at 3 MA. 17 kJ of Al K-shell radiation was obtained in one Al planar array fielded at 5.5 MA, 57 ns and we compare this to cylindrical array results in the context of a K-shell yield scaling model. We have also performed an initial study of compact 3 mm diameter cylindrical wire arrays, which are alternate candidates for a multi-pinch vacuum hohlraum concept. These massive 3.4 and 6 mg/cm loads may have been impacted by opacity, producing a maximum x-ray power of 7 TW at 4.5 MA, 45 ns. Future research directions in compact x-ray sources are discussed. 4 AcknowledgmentWe thank M. Lopez (1675), G. T. Liefeste (1675), and J. L. Porter (1670) for providing load hardware and diagnostic support; L.B. Nielsen-Weber (1675) and D.S. Nielsen (1675) for extensive support of diagnostic installation, fielding, and film processing;

show abstract

“…Currently, x-ray spectra of X-pinches are collected and studied at dif ferent pulsed power machines, for exam ple, at the university-scale 1 MA Zebra device at University of Nevada, Reno [8][9][10][11][12] and Cobr a f acility a t Cornell University (CU ) [11][12], as well as at smaller devices such as at a 450 kA pulsed power device at C U [13]. It was shown that X-pinch plasm a can r each tem peratures of 2-3 keV and densities up to 10 23 cm -3 .…”

Section: Introductionmentioning

confidence: 99%

The importance of EBIT data for Z-pinch plasma diagnostics

Safronova¹,

Kantsyrev²,

Neill³

et al. 2008

Can. J. Phys.

View full text Add to dashboard Cite

The results from the last si x years of x-ray spectrosc opy and spectropolarim etry of high energy density Z-pinch plasm as co mplemented by experim ents with the electron beam ion trap (EBIT) at th e Lawrence Livermore National Laboratory (LLNL) are presented. T he two topics discussed are the development of M-shell xray W spectroscopic diagnosti cs and K-shell Ti spectr opolarimetry of Z-pinch plasmas. The main focus is on radiation fr om a specific load configuration called an

show abstract

Radiative Properties of Implosions of Stainless Steel Wire Arrays with Application to Astrophysics

Cited by 5 publications

References 0 publications

Radiative properties of implosions of combined X-pinches and planar wire arrays composed from different wire materials on the UNR 1 MA Z-pinch generator

Radiative properties of implosions of combined X-pinches and planar wire arrays composed from different wire materials on the UNR 1 MA Z-pinch generator

Compact wire array sources: power scaling and implosion physics.

The importance of EBIT data for Z-pinch plasma diagnostics

Contact Info

Product

Resources

About