Radiation sources with planar wire arrays and planar foils for inertial confinement fusion and high energy density physics research

Kantsyrev, V.L.; Chuvatin, A. S.; Safronova, A.S.; Rudakov, L. I.; Esaulov, A. A.; Velikovich, A. L.; Shrestha, I.; Astanovitsky, A.; Osborne, G. C.; Shlyaptseva, V. V.; Weller, M. E.; Keim, S. F.; Stafford, A.; Cooper, M.C.

doi:10.1063/1.4865367

Cited by 29 publications

(25 citation statements)

References 19 publications

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“…Experiments on the Zebra generator at standard current of 1 MA have demonstrated that planar wire arrays (PWA) are very efficient radiators and in particular muti-planar wire arrays can be very useful in studying radiation from two different wire materials in space and time [4]. Experiments on the Zebra generator with LCM (Load Current Multiplier, provides 1.5-1.7 MA) allow for implosions of larger sized wire array loads including PWAs than at standard current of 1 MA as well as new applications such as to ICF [5]. In this work modified multi-planar wire arrays are tested that consisted of two outer wire planes, each 4.9 mm width that were made of eight mid-atomic-number (Alumel with 95% of Ni) wires with the inter-row gap increased from 3 or 6 mm (usually used at 1 MA current) up to 9 mm.…”

Section: Motivation Experimental Details and Resultsmentioning

confidence: 99%

Larger sized wire arrays on 1.5 MA Z-pinch generator

Safronova¹,

Kantsyrev²,

Weller³

et al. 2014

AIP Conference Proceedings

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Abstract. 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 multiplanar wire arrays had two outer wire planes from mid-atomic-number wires to create a global magnetic field (gmf) and plasma flow between them. A modified central plane with a few Al wires at the edges was put in the middle between outer planes to influence gmf and to create Al plasma flow in the perpendicular direction (to the outer arrays plasma flow). Such modified plane has different number of empty slots: it was increased from 6 up to 10, hence increasing the gap inside the middle plane from 4.9 to 7.7 mm, respectively. Such load configuration allows for more independent study of the flows of L-shell mid-atomic-number plasma (between the outer planes) and K-shell Al plasma (which first fills the gap between the edge wires along the middle plane) and their radiation in space and time. We demonstrate that such configuration produces higher linear radiation yield and electron temperatures as well as advantages of better diagnostics access to observable plasma regions and how the load geometry (size of the gap in the middle plane) influences K-shell Al radiation. In particular, K-shell Al radiation was delayed compared to L-shell mid-atomic-number radiation when the gap in the middle plane was large enough (when the number of empty slots was increased up to ten). MOTIVATION, EXPERIMENTAL DETAILS, AND RESULTS

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Section: Motivation Experimental Details and Resultsmentioning

confidence: 99%

Larger sized wire arrays on 1.5 MA Z-pinch generator

Safronova¹,

Kantsyrev²,

Weller³

et al. 2014

AIP Conference Proceedings

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“…We mitigated the risk of arcs forming at this magnetic null by removing the central part of the cathode (see FIG.1a and FIG. 2a) [4]. Driven in parallel, PWA sources showed synchronized sub-keV (>0.2 keV) x-ray bursts with nearly equal amplitudes (FIG.…”

Section: Demonstration Of Equally Redistributed Currents and The Syncmentioning

confidence: 99%

“…Our UNR group, together with A. Chuvatin (and support from the SNL), designed and used the 100 ns LCM (increased Zebra current I from 0.9 to 1.7 MA) [11]. The two innovative approaches mentioned in the beginning were used in combination to produce a new concept of compact hohlraum radiation source for ICF [1] and yielded the first experimental results with simplified hohlraum design at Zebra/LCM in coordination with B. Jones, M. Cuneo and R. Vesey from the SNL [4]. The new proposed hohlraum concept is based on application of parallel-driven PWAs placed in compact cavities around central hohlraum cavity with capsule/target in the middle [1].…”

Section: Introductionmentioning

confidence: 99%

“…Compact, mm-scale, double-PWA (DPWA) and triple-PWA (TPWA) have demonstrated: larger resistive energy (>30 kJ/cm) and power (> 1TW/cm) gain [3], highest yield current scaling (I 1.8÷2 ) [3] among all loads tested at University-scale machines, anisotropy of power/yield dependent on wires' rows [5], and the possibility of radiation pulse shaping [6]. Planar foil liner (PFL) source (a promising alternative source to wire arrays [4]) has also shown yields which are close to the one of PWA, but with better axial Te and Ne gradients [4]. Pioneered at UNR, the PWA Z-pinch loads have later been tested at SNL on the Saturn generator (I = 3-6 MA) [1], on GIT-12 machine in Russia (I=3 MA) [7], and on the QiangGuang-1 generator in China (I=1.5 MA) [8].…”

Section: Introductionmentioning

confidence: 99%

“…The first success was the development of new sources -planar wire arrays (PWAs) [2], that our UNR group led since 2005. PWA turned out to be an effective radiator [2][3][4]. Compact, mm-scale, double-PWA (DPWA) and triple-PWA (TPWA) have demonstrated: larger resistive energy (>30 kJ/cm) and power (> 1TW/cm) gain [3], highest yield current scaling (I 1.8÷2 ) [3] among all loads tested at University-scale machines, anisotropy of power/yield dependent on wires' rows [5], and the possibility of radiation pulse shaping [6].…”

Section: Introductionmentioning

confidence: 99%

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New compact hohlraum configuration research at the 1.7 MA Z-pinch generator

Kantsyrev¹,

Chuvatin²,

Rudakov³

et al. 2014

AIP Conference Proceedings

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Abstract.A new compact Z-pinch x-ray hohlraum design with parallel-driven x-ray sources was experimentally demonstrated in a full configuration with a central target and tailored shine shields (to provide a symmetric temperature distribution on the target) at the 1.7 MA Zebra generator. This presentation reports on the joint success of two independent lines of research. One of these was the development of new sources --planar wire arrays (PWAs). PWAs turned out to be a prolific radiator. Another success was the drastic improvement in energy efficiency of pulsed-power systems, such as the Load Current Multiplier (LCM). The Zebra/LCM generator almost doubled the plasma load current to 1.7 MA. The two above-mentioned innovative approaches were used in combination to produce a new compact hohlraum design for ICF, as jointly proposed by SNL and UNR. Good agreement between simulated and measured radiation temperature of the central target is shown. Experimental comparison of PWAs with planar foil liners (PFL) -another viable alternative to wire array loads at multi-MA generators show promising data. Results of research at the University of Nevada Reno allowed for the study of hohlraum coupling physics at University-scale generators. The advantages of new hohlraum design applications for multi-MA facilities with W or Au double PWAs or PFL x-ray sources are discussed.

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