Recent ACE 4 Z-pinch experiments: Long implosion time argon loads, uniform fill versus annular shell distributions and the Rayleigh-Taylor instability problem

Coleman, P.L.; Rauch, J.; Rix, W.; Thompson, J.; Wilson, R.

doi:10.1063/1.53816

Cited by 16 publications

(3 citation statements)

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“…Large-diameter implosions are the subject of intense investigation [9]- [16]. Such implosions are needed 1) to achieve the high specific energy required to excite K-shell line radiation from high atomic number Z-pinches, 2) to properly match the load to high-current (∼10 MA and higher) generators [17]- [20], 3) to develop continuum radiator concepts that require heating beyond the optimum He/H-like state for K-shell emission [8], and 4) to more efficiently utilize generators with long-rise-time (> 100 ns) currents.…”

Section: Measurement and Analysis Of Continuum Radiationmentioning

confidence: 99%

Measurement and Analysis of Continuum Radiation From a Large-Diameter Long Implosion Time Argon Gas Puff$Z$-Pinch at 6 MA

Young

Commisso

Murphy

et al. 2006

IEEE Trans. Plasma Sci.

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Time-resolved measurements of the absolute freebound (FB) continuum spectrum emitted from a 12-cm-diameter argon gas-puff Z-pinch driven at ∼6-MA peak current with 220-to 260-ns implosion times are reported. A crystal spectrometer is used with silicon diode detectors to provide kiloelectronvolt spectral resolution. The energy and absolute-intensity calibration procedures for the spectrometer are described. The slope of the FB continuum is well represented by a decaying exponential spectrum with a single electron temperature from which spatially averaged, time-resolved (T e (t)), and time-integrated ( T e ) electron temperatures are inferred. An expression for the absolute FB continuum, which takes into account recombination onto bare as well as H-like species, is presented and used to infer time-integrated spatially averaged ion densities n i . The values of T e and n i are in general agreement with the values of these quantities obtained by using the conventional K-shell line-ratio method. Values of T e (t) peak on the rise of the continuum radiation pulse and gradually decrease during the pulse. The fraction of the total energy radiated in the K-shell that resides in the FB continuum is 6%-10%, and this fraction increases with n i . Calculated continuum spectra are in agreement with measured spectra.Index Terms-Electron temperature, free-bound continuum spectrum, ion density, Z-pinch.

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Section: Measurement and Analysis Of Continuum Radiationmentioning

confidence: 99%

Measurement and Analysis of Continuum Radiation From a Large-Diameter Long Implosion Time Argon Gas Puff$Z$-Pinch at 6 MA

Young

Commisso

Murphy

et al. 2006

IEEE Trans. Plasma Sci.

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“…are very unstable~Baksht et al, 1995;Coleman et al, 1997;Commisso et al, 1998;Cochran, Davis & Velikovich, 1995!. is associated with largescale instabilities which inevitably develop in an imploding z-pinch.…”

Section: Introductionmentioning

confidence: 99%

The K-shell radiation of a double gas puff z-pinch with an axial magnetic field

et al. 2003

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A double shell z-pinch with an axial magnetic field is considered as a K-shell plasma radiation source. One-dimensional radiation-hydrodynamics calculations performed suggest that this scheme holds promise for the production of the K-shell radiation of krypton~hn ' 12-17 keV!. As a first step in verifying the advantages of this scheme, experiments have been performed to optimize a neon double-shell gas puff with an axial magnetic yield for the K-shell yield and power. The experiments show that the application of an axial magnetic field makes it possible to increase the K-shell radiation power and reduce the shot-to-shot spread in the K-shell yield. Comparisons between the experiments and modeling are made and show good agreement.

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“…The POS has been applied at the 0.5 to 4 MA current levels to drive electron-beam diodes [1]- [3], [30] and z-pinches [4], [5], [31]. Howeve r, problems related to the efficiency of energy coupling to loads prohibited a wide use of the technique.…”

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confidence: 99%

On the Role of the Plasma Composition in the Magnetic Field Evolution in Plasma Opening Switches

Osin

Doron

Arad

et al. 2004

IEEE Trans. Plasma Sci.

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Abstract-High spatial-and temporal-resolution spectroscopic methods are employed to perform detailed studies of the interaction between the propagating magnetic field and a multi-ion-species plasma. The experiment is performed in a plasma-opening-switch configuration, in which a 150-kA current of 400 ns duration is conducted through a plasma. Recent observations demonstrated a new phenomenon of simultaneous rapid magnetic field penetration into the heavy-ion plasma and specular reflection of the light-ion plasma, leading to ion-species separation. Additionally, noticeable inconsistencies between experimental results and theories were found. The current paper summarizes these recent results and discusses the aspect of the role of the plasma composition in the magnetic field evolution and ion dynamics. In order to systematically investigate the effect of the plasma composition, a method for producing plasmas with controllable compositions, based on spatial species separation and electrode heating, is presented. This method allows for achieving plasmas with varying proton-to-carbon ion ratios, however, at different electron densities. Measurements are described for studying the relation between the magnetic field propagation velocity and the plasma composition and density; however, this relation is not yet satisfactorily clear.Index Terms-Magnetic field-plasma interaction, multi-ion species plasma, plasma devices, plasma spectroscopy.

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Recent ACE 4 Z-pinch experiments: Long implosion time argon loads, uniform fill versus annular shell distributions and the Rayleigh-Taylor instability problem

Cited by 16 publications

References 0 publications

Measurement and Analysis of Continuum Radiation From a Large-Diameter Long Implosion Time Argon Gas Puff$Z$-Pinch at 6 MA

Measurement and Analysis of Continuum Radiation From a Large-Diameter Long Implosion Time Argon Gas Puff$Z$-Pinch at 6 MA

The K-shell radiation of a double gas puff z-pinch with an axial magnetic field

On the Role of the Plasma Composition in the Magnetic Field Evolution in Plasma Opening Switches

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