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X-pinch x-ray sources driven by a capacitor discharge
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10.1063/1.2953800
/content/aip/journal/pop/15/7/10.1063/1.2953800
http://aip.metastore.ingenta.com/content/aip/journal/pop/15/7/10.1063/1.2953800
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Schematic of the experimental setup. Two Silicon p-n junction photodiodes and two pinhole cameras were often installed simultaneously on the radial ports to view the plasma in a single shot.

Image of FIG. 2.
FIG. 2.

Typical current signals (with a quarter period of ) obtained with an integrated B-dot current probe placed in the midplane of the X pinch. The short circuit current is compared with the plasma current which typically crowbars after peak current. The B-dot signal was identical in time to the signal from a Rogowski coil placed around the ground electrode.

Image of FIG. 3.
FIG. 3.

Time-integrated optical photographs of a tungsten X pinch obtained with different neutral density filters. The full anode-cathode gap can be seen. The anode is at the bottom.

Image of FIG. 4.
FIG. 4.

Typical x-ray pinhole photographs and filter transmission curves. The cathode is at the top and the anode at the bottom in all images. (a) aluminum and (b) tungsten X pinches obtained with . The films were filtered with aluminized mylar which has a cutoff energy of about . The limbs can be seen almost down to the anode. (c) An example of a tungsten pinch observed with a pinhole and a Ti filter. (d) 4-wire titanium X pinch using a pinhole filtered with Ti and Be. A hot spot at the crossing point is often separated from bright spots located at the “heads” of the limbs. (e) aluminum filtered with Ti. A bright, almost circular hot spot is seen at the wire crossing point, suitable for point projection imaging.

Image of FIG. 5.
FIG. 5.

X-ray radiographs of a common housefly imaged with (a) a constantan X pinch and (b) a molybdenum X pinch. Features as small as can be made out from such images, indicating a very small, well-defined, bright x-ray source.

Image of FIG. 6.
FIG. 6.

An image from the slit-wire camera obtained with a constantan X pinch. The tungsten wire and the aluminum wire were placed in front of a slit located from the X pinch. The film was filtered with Ti and placed from the slit. The image shows clearly the shadows of both wires, indicating that the x-ray source size has an upper limit of .

Image of FIG. 7.
FIG. 7.

Typical Silicon photodiode signals filtered with Be showing either single or multiple burst features. (a) Two-wire aluminum; (b) two-wire tungsten; and (c) four-wire titanium. A typical plasma current is included to illustrate the relative timing between the current pulse and the x-ray bursts.

Image of FIG. 8.
FIG. 8.

Time sequence of interferograms showing the evolution of a tungsten X pinch obtained from different shots. The times indicated by are with respect to the of the current pulse; times indicated by are with respect to the onset of x-ray emission. In all images the cathode is at the top and the anode at the bottom.

Image of FIG. 9.
FIG. 9.

Sequence of schlieren photographs showing the evolution of a tungsten X pinch obtained from different shots. The times indicated by are with respect to the time of peak x-ray emission; times indicated by are with respect to the onset of x-ray emission. The cathode is at the top and the anode at the bottom in all these images.

Image of FIG. 10.
FIG. 10.

Aluminum resonance line and nearby satellite line obtained with a flat PET crystal spectrograph. The He-like intercombination line can also be seen.

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/content/aip/journal/pop/15/7/10.1063/1.2953800
2008-07-15
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: X-pinch x-ray sources driven by a 1μs capacitor discharge
http://aip.metastore.ingenta.com/content/aip/journal/pop/15/7/10.1063/1.2953800
10.1063/1.2953800
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