Multiwire$X$-Pinches at 1-MA Current on the COBRA Pulsed-Power Generator

Shelkovenko, T. A.; Pikuz, S. A.; Douglass, J.D.; McBride, R. D.; Greenly, J. B.; Hammer, D. A.

doi:10.1109/tps.2006.878362

Cited by 62 publications

(28 citation statements)

References 19 publications

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“…The load configuration is two (or more) fine metallic wires in a single array that cross and touch at a single point, forming an "X" shape. When a fast-rising high current (dI/dt > 1 kA/ns) [2] passes through the wires, a localized X-ray source is produced with an X-ray pulse duration less than 1 ns, a spot size ∼1 μm, and X-ray energies in the 1-10-keV range for a 0.2-MA generator [3]. X-pinch studies at the 0.2-0.5-MA current level have been carried out in many laboratories worldwide.…”

Section: X-pinchmentioning

confidence: 99%

$X$-Pinch Experiments on 1-MA “QiangGuang-1” Facility

Qiu

et al. 2010

IEEE Trans. Plasma Sci.

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The results of an experimental investigation of X -pinch performance on the 1-MA "QiangGuang-1" facility are presented. "QiangGuang-1" is a linear-transformer-driver-based low-impedance pulsed power machine which provides a peak current of 0.9-1.3 MA and a 10%-90% rise time of 50-60 ns. X -pinch loads with 2-32 wires of different wire materials (Al, W, and Mo) with wire diameters from 25 to 100 μm have been tested. The number and size of bright spots, timing of the first X-ray burst, X -pinch dynamics, and X-ray spectroscopy have been studied using a set of diagnostics with spatial and/or temporal resolution. A single bright spot obtained from a 30 × 25 μm W X -pinch produced 42 J (35 GW) in the 1-10-keV energy range. The smallest bright spot size (radiating > 1.2 keV) observed was about 70 μm. Linear relations between the timing of the first X-ray burst and the wire parameters (diameter and number) in W X -pinches were observed. A spatially large extreme ultraviolet plasma radiation region at the crossing point was typically observed. Al X -pinch plasma parameters were estimated from X-ray spectroscopy.Index Terms-Plasma diagnostics, pulse power, X -pinch, X-ray spectroscopy.

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Section: X-pinchmentioning

confidence: 99%

$X$-Pinch Experiments on 1-MA “QiangGuang-1” Facility

Qiu

et al. 2010

IEEE Trans. Plasma Sci.

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“…Wire-array Z-pinches are of great interest to the scientific community due to the ease with which they produce high-energy-density plasmas on university scale pulsed power machines [1][2][3][4] and the high efficiency with which they generate >100TW x-ray pulses on the highest power generators. 5 The most prominent application of high power x-ray sources is inertial confinement fusion (ICF).…”

Section: Introductionmentioning

confidence: 99%

Plasma density measurements in tungsten wire-array Z-pinches

et al. 2012

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Measurements of the plasma density profile near the exploding wires in 1 MA tungsten (W) wirearray Z-pinches have been made using calibrated x-ray absorption. As many as 5 x-ray images per pulse were obtained between 65 and 160 ns after the start of the 100 ns rise time current pulse. Measured W ion densities range from above 10 19 =cm 3 close to the wire to $10 17 =cm 3 about 1 mm away from the wire in the plasma stream. After accurate geometrical registration of the individual wires in each successive image in a pulse using the Genetic Algorithm, the temporal evolution of the axial modulation wavelength distribution of the ablation rate from the wires in each array and the global mass-ablation rate as a function of time are presented. V C 2012 American Institute of Physics. [http://dx.

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“…The primary reason for the presence of multiple keV x-ray bursts in our Mo X-pinch tests was that the linear mass density of the loads was mismatched with the currents delivered to them. Previous experiments 5,27 show that for a proper X-pinch load that generates a single x-ray burst, the burst is usually produced at the time instant before the current maximum but after the maximum of the current derivative. However, in our tests when the first x-ray burst took place, the load current did not even reach half of its maximum and the current derivative was still under increase ͓Fig.…”

Section: A Mo X-pinch Testmentioning

confidence: 99%

“…[1][2][3][4][5][6][7] The pulsed current electrically explodes the wires, leading to a complex pinch dynamics near the cross-point where one or more bright x-ray bursts in 1-10 keV may be produced. 2,8,9 In the past decades, X-pinch plasmas have aroused a lot of interests not only because they are excellent point x-ray sources ͓e.g., a source of ϳ1 m scale with subnanosecond duration in 3-5 keV ͑Ref.…”

Section: Introductionmentioning

confidence: 99%

Study of keV radiation properties of Mo and Ti X-pinch plasma sources using a pinhole transmission grating spectrometer

2010

Physics of Plasmas

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The properties of keV x-ray radiations from Mo and Ti X-pinch plasma sources at the current of 800 kA were investigated by a pinhole transmission grating spectrometer. The spectrometer was characterized by a high linear dispersion rate ͑2.9 Å/mm͒, and from its time-integrated diffraction images, rich information about the X-pinch sources ͑e.g., source number, source size, and absolute spectra͒ could be obtained. Multiple hot spots were produced in all the Mo tests with loads made of two or four 25 m wires with or without a shunt wire, and obvious increases both in the radiation intensity and in the source size around the spectral region of 2.6 keV were observed. In Ti X-pinch tests, a single keV x-ray burst with a source size of ϳ200 m and a time duration of ϳ200 ps in full width at half maximum was obtained using a load made of two 50 m wires plus a shunt wire. The intensity of x-rays decreased sharply from ϳ10 11 photon eV −1 sr −1 at 1 keV to ϳ10 8 photon eV −1 sr −1 at 4 keV. The energy-dependent source size in the band of 1-4 keV is less than 100 m and seemed to shrink quickly as x-ray energy increases.

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Multiwire$X$-Pinches at 1-MA Current on the COBRA Pulsed-Power Generator

Cited by 62 publications

References 19 publications

$X$-Pinch Experiments on 1-MA “QiangGuang-1” Facility

$X$-Pinch Experiments on 1-MA “QiangGuang-1” Facility

Plasma density measurements in tungsten wire-array Z-pinches

Study of keV radiation properties of Mo and Ti X-pinch plasma sources using a pinhole transmission grating spectrometer

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