Results of radius scaling experiments and analysis of neon K-shell radiation data from an inductively driven Z-pinch

Commisso, R.J.; Apruzese, J. P.; Black, D. C.; Boller, J.R.; Moosman, B.; Mosher, D.; Stephanakis, S. J.; Weber, B.V.; Young, F.C.

doi:10.1109/27.725135

Cited by 41 publications

(12 citation statements)

References 36 publications

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“…A lower operating voltage usually results in simpler power flow and reductions in the cost of the generator. Experiments on SHIVA, 1 PEGASUS, 2 FALCON, 3 and HAWK 4 have pursued this arena of Z-pinch research, particularly for applications where the x-ray yield is important but high powers are not needed. Based on the results of these previous long implosion time experiments, high-power applications, such as vacuum hohlraums and ''flying radiation case'' experiments, 5,6 were assumed to require 100-ns class pulsed-power drivers to obtain the requisite short, high-power x-ray pulses.…”

Section: Introductionmentioning

confidence: 99%

Radiative properties of high wire number tungsten arrays with implosion times up to 250 ns

et al. 1999

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High wire number, 25-mm diameter tungsten wire arrays have been imploded on the 8-MA Saturn generator, operating i n a long-pulse mode. By varying the mass load from 710 to 6140 ug/cm, implosion times of 130 to 250 ns have been obtained with implosion velocities of 50 to 25 c d p s , respectively. z-pinch implosions produced plasmas with millimeter diameters that radiated 600 to 800 kJ of x-rays, with powers of 20 to 49 TW; the c&esponding pulsewidths were 19 to 7.5 ns, with risetimes ranging from 6.5 to 4.0 ns. These powers and pulsewidths are similar to those achieved with 50 ns implosion ti mes on S at u r n . Two -d i men s io n a1 , rad i a t i o nmagnetohydrodynamic calculations indicate that the imploding shells in these long implosion time experiments are comparable in width to those in the short pulse cases. This can only be due to lower initial perturbations. A heuristic wire array model suggests that the reduced perturbations, in the long pulse cases, may be due to the individual wire merger occurring well before the acceleration of the shell.The experiments and modeling susgest that 150 to 200 ns implosion time z-pinches could be employed for high-power, x-ray source applications.

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Section: Introductionmentioning

confidence: 99%

Radiative properties of high wire number tungsten arrays with implosion times up to 250 ns

et al. 1999

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“…Certain parameters affect the generation of gaspunch z-pinch plasmas, such as the z-pinch current value, the current rise time, the type of working gas, the initial plasma diameter [14,15], the injected gas pressure [16], the gas injection timing, the gap length between the z-pinch electrodes [17], and the electrode shape [18]. Pulsed power generators have been used to produce a gas-puff z-pinch in order to supply large currents rapidly.…”

Section: Introductionmentioning

confidence: 99%

Influence of gap length on the gas‐puff z‐pinch plasma produced by an inductive pulsed power system

Imasaka¹,

Takahashi²,

Suehiro³

et al. 2003

Electrical Engineering Japan

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SUMMARYIn this study, an argon gas-puff z-pinch plasma was produced by an inductive pulsed power system. The gap length dependence of plasma characteristics such as the pinch plasma behavior, soft x-ray emissions, and spatial distribution of hot spots, was investigated. The soft x-ray output decreased with gap length, and hot spots generated by sausage instability were distributed along the z-axis for shorter delay times of the discharge onset. However, hot spots were distributed in the center of the gap space with increased delay times, regardless of the gap length, and the number of hot spots decreased.

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“…Until recently, the pursuit of efficient long implosion time Z pinches has focused mainly on K-shell x-ray producing gas puffs 10,11 with some work on foils to produce highpower, broadband x-ray sources. 12,13 These experiments demonstrated that Z pinches in longer implosion modes ͑200-2000 ns͒ are still efficient radiators, even in the K shell of low atomic number elements like neon.…”

Section: Introductionmentioning

confidence: 99%

Long implosion time tungsten wire array Z pinches on the Saturn generator

et al. 2000

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Recent success on the Saturn [C. Deeney et al., Phys. Rev. E 56, 5945 (1997)] and Z [R. B. Spielman et al., Phys. Plasmas 5, 2105 (1998)] accelerators at Sandia National Laboratories have demonstrated the ability to scale Z-pinch parameters to increasingly larger current pulsed power facilities. Next generation machines will require even larger currents (>20 MA), placing further demands on pulsed power technology. To this end, experiments have been carried out on Saturn operating in a long pulse mode, investigating the potential of lower voltages and longer implosion times while still maintaining pinch fidelity. High wire number, 25 mm diam tungsten arrays were imploded with implosion times ranging from 130 to 240 ns. The results were comparable to those observed in the Saturn short pulse mode, with rise times on the order of 4.5–6.5 ns. Experimental data will be presented, along with two-dimensional radiation magnetohydrodynamic simulations used to explain and reproduce the experiment.

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Results of radius scaling experiments and analysis of neon K-shell radiation data from an inductively driven Z-pinch

Cited by 41 publications

References 36 publications

Radiative properties of high wire number tungsten arrays with implosion times up to 250 ns

Radiative properties of high wire number tungsten arrays with implosion times up to 250 ns

Influence of gap length on the gas‐puff z‐pinch plasma produced by an inductive pulsed power system

Long implosion time tungsten wire array Z pinches on the Saturn generator

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