Efficient Radiation Production in Long Implosions of Structured Gas-Puff<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Z</mml:mi></mml:math>Pinch Loads from Large Initial Radius

Sze, H.; Banister, J.; Failor, B. H.; Levine, Jerrold S.; Qi, N.; Velikovich, A. L.; Davis, J.; Lojewski, D.; Sincerny, P.

doi:10.1103/physrevlett.95.105001

Cited by 61 publications

(34 citation statements)

References 15 publications

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“…26 With no inner shell to smooth the transition from the outer shell onto the center jet, the K shell yield dropped by a factor of 3, to 7.1 kJ and the pulse width increased by a factor of 4, to 29.1 ns. The pinch is also quite fat; the axial average ͑emission weighted͒ FWHM of the K shell image is 3.2 mm, compared to 1.5 mm for the 20.1:2.8:0.9 case.…”

Section: A Center Jet and Outer Shell Only "Jet:outer…mentioning

confidence: 98%

Implosion dynamics and radiative characteristics of a high yield structured gas puff load

Levine¹,

Banister²,

Failor³

et al. 2006

Physics of Plasmas

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A large diameter gas puff nozzle, designed to produce a radial mass profile with a substantial fraction of the injected mass on the axis, has demonstrated an increase in K shell yield by nearly a factor of 2, to 21kJ, in an argon Z pinch at 3.5MA peak current and 205ns implosion time [H. Sze, J. Banister, B. H. Failor, J. S. Levine, N. Qi, A. L. Velikovich, J. Davis, D. Lojewski, and P. Sincerny, Phys. Rev. Lett. 95, 105001 (2005)] and 80kJ at 6MA and 227ns implosion time. The initial gas distribution produced by this nozzle has been determined and related to measured plasma dynamics during the implosion run-in phase. The role of two gas shells and the center jet are elucidated by the inclusion of a tracer element sequentially into each of the three independent plenums and by evacuating each plenum. The implosion dynamics and radiative characteristics of the Z pinches are presented.

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Section: A Center Jet and Outer Shell Only "Jet:outer…mentioning

confidence: 98%

Implosion dynamics and radiative characteristics of a high yield structured gas puff load

Levine¹,

Banister²,

Failor³

et al. 2006

Physics of Plasmas

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“…Like the new AASC nozzle, the Titan nozzle used in the prerefurbished Z experiments is an 8 cm diameter multi-shell nozzle that consists of: 1) an outer region nozzle "pusher" that carries the current and couples the energy from the driver and 2) an inner plasma region "stabilizer" that stabilizes the pinch to the RayleighTaylor (RT) instability through the process of "snowplow stabilization" [4,5] In this snowplow stabilization process, having a thick inner region plasma makes it difficult for the magnetic piston to penetrate through the plasma layers because mass is constantly being accreted from this inner region and suppresses the magnetic "bubbles" characteristic of the RT instability. This nested cylindrical annulus configuration has proven to be superior to a single cylindrical annulus configuration for both gas puff and wire array loads in terms of producing higher radiative powers and K-shell yields.…”

Section: Introductionmentioning

confidence: 99%

Two-dimensional radiation MHD modeling assessment of designs for argon gas puff distributions for future experiments on the refurbished Z machine

Thornhill

Giuliani

Chong

et al. 2012

High Energy Density Physics

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“…Tailored mass density profiles such as double or triple gas puff valves have been successfully used to reduce the instabilities. 1 Here, we present initial studies of z-pinch implosion stabilization with an external Bz field.…”

Section: Introductionmentioning

confidence: 99%

Gas puff Z-pinch implosions with external Bz field on COBRA

Grouchy

Schrafel

et al. 2014

AIP Conference Proceedings

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Abstract. We present preliminary experimental results on mitigating Magneto-Rayleigh-Taylor (MRT) instabilities by applying an external Bz field. The experiments were conducted on the 1-MA, 200-ns COBRA generator at Cornell University. In the experiments, a triple-nozzle was used to produce z-pinch loads from concentric outer and inner annular gas puffs and a center gas puff column. A single coil was used to produce a Bz field in the pinch region. We have used two 4-frame 2-ns gated EUV cameras to obtain images of the imploding plasmas, in which the MRT instabilities were observed. The MRT instabilities can grow when the plasma accelerates toward the axis. With a triple gas puff (outer, inner and center puff), reduced acceleration or de-acceleration of the imploding plasma occurred when the outer puff plasma imploded onto the inner annular puff plasma resulting a relatively stable implosion. In the absent of the inner annular gas puff, the imploding outer annular plasma continued to accelerate toward the axis. Large turbulent flares at the edge of the implosion or pinch plasma were observed. The implosion was not stable. To stabilize the implosion without the inner gas puff, a Bz field was applied. This external Bz field was compressed by the outer imploding plasma shell. A relatively stable implosion was observed. Increasing the Bz field to 2-kG resulted in a relatively fatter pinch plasma.

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Efficient Radiation Production in Long Implosions of Structured Gas-PuffZPinch Loads from Large Initial Radius

Cited by 61 publications

References 15 publications

Implosion dynamics and radiative characteristics of a high yield structured gas puff load

Implosion dynamics and radiative characteristics of a high yield structured gas puff load

Two-dimensional radiation MHD modeling assessment of designs for argon gas puff distributions for future experiments on the refurbished Z machine

Gas puff Z-pinch implosions with external Bz field on COBRA

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