(a) A vacuum chamber with a cathode (C), anode plate (a), load (L), and return current cage (RC). (b) A three-ray star wire array with gates in the inner cylinder.
(a) and (b) Two-frame shadowgram of implosion (7 ns between frames) in the star wire array , 15 wires in diameter, with the gate width of 1.2 mm (shot 1246). (c) Configuration of the wire array and direction of laser probing (c).
Streak-camera images of implosions in Al 15-wire star arrays , with the gate widths of (a) 0.3 mm and (b) 0.8 mm.
Total x-ray energy (squares), peak power (diamonds), and keV energy (triangles) radiated by three-ray stars arrays. Shots 1710, 1719, 1734, and 1737 present regular stars with nine wires, in diameter. Stars with gates (12 wires in diameter) are presented by shots 1717 and 1718 and shots 1732 and 1733 . Wire arrays in shots 1719 and 1734 were made of pure Al and other arrays were made of Al 5056 alloy with 5% of Mg.
Total x-ray energy (squares), peak power (diamonds), and keV energy (triangles) radiated by linear arrays with masses of (shots 1659, 1660, 1662, and 1663) and (shots 1665, 1677, 1692, and 1697). Shots 1659, 1663, 1665, and 1697 were done with regular linear array and shots 1660, 1662, 1677, and 1692 were done with wire linear arrays with gates, ).
Timing diagrams for eight shots from stars with gates (1–4) and regular stars (5–8). Masses of loads are , the gate widths are (3 and 4) and 2 mm (1 and 2). X-ray pulses are taken from the XRD with a Kimfol filter.
Drawing of the star wire array with long wires in the inner cylinder.
(a) Shadowgram of implosion in Al star (12 wires in diameter) with long gate wires and the gate width of 0.5 mm (shot 1695). (b) Configuration of wires in the array and probing direction.
Shadowgrams of implosions in (a) and (b) six-wire Al and (c) mixed Al–Ti and (d) Al–Au linear arrays. Configuration of wires is presented on the top of shadowgrams. Delay of shadowgrams to the beginning of the current pulse is (a) 51 ns, (b) 47 ns, (c) 71 ns, and (d) 76 ns. All arrays are 10 mm in width.
(a) and (b) Shadowgrams at wavelengths of (a) 532 nm and (b) 266 nm of implosion in star with six Al wires in diameter and six SS long gate wires in diameter, (shot 1701). Diagram (c) presents timing of the current pulse (1), x-ray pulse from the PCD with the Be filter (2), and shadowgrams (arrow). (d) Configuration of wires in the array and probing direction.
(a) Shadowgram at the wavelength of and 266 nm of implosion in Al star with nine Al wires in diameter and long W wires in diameter in the inner cylinder (shot 1702). (b) Configuration of wires in the array and probing direction.
(a) Current in the inner cylinder of the three-ray star array as a function of the gate wire width. Diamonds represent stars with different gate widths. The circle represents current in a regular star with single wires in the inner cylinder. Squares and triangles represent stars with long wires in the gates. The diameters of the plasma column of inner wires are 0.4 mm (circle, diamonds, and squares) and 0.2 mm (triangles).
Configuration of the magnetic field in the three-ray star wire array with 2 mm gates from 3D MHD GORGON simulations. (a) The magnetic field at the current prepulse at 30 ns before the main current pulse, . (b) The magnetic field at 40 ns after the beginning of the main current pulse.
3D resistive MHD simulations of the cascade implosion and trapping of the imploding plasma in Al star wire arrays with gates . The timing of frames to the beginning of the current pulse is (a) 28 ns, (b) 53 ns, (c) 82 ns, (d) 88 ns, (e) 91 ns, and (f) 96 ns. The scale range is from to .
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