Jian Wu, Yihan Lu, Fengju Sun, Xiaofeng Jiang, Zhiguo Wang, Daoyuan Zhang, Xingwen Li, Aici Qiu. Researches on preconditioned wire array Z pinches in Xi’an Jiaotong University[J]. Matter and Radiation at Extremes, 2019, 4(3): 036201
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- Matter and Radiation at Extremes
- Vol. 4, Issue 3, 036201 (2019)
Fig. 1. Preconditioning of the wire array using an auxiliary prepulse current.
Fig. 2. Diagram of the 1 kA compact current generator.
Fig. 3. (a) Schlieren image of an exploding tungsten wire 15 µ m in diameter, 1 cm in length, with a 2 µ m PI coating. (b) Interferogram of the exploding products. (c) Areal density distribution reconstructed from the interferogram.
Fig. 4. (a) 532 nm and (b) 1064 nm double-wavelength interferograms for a hollow cylindrical load. (c) Atomic areal density. (d) Electronic areal density.42 Reprinted with permission from Li et al. , Phys. Plasmas 25 , 012705 (2018). Copyright 2018 AIP Publishing LLC.
Fig. 5. (a)–(d) Interferometric images at different times from different shots. All the loads tested were two 15 µ m Al wires, 1 cm in length and with 1 mm spacing. White arrows indicate the initial positions of the wires.35 Reprinted with permission from Wu et al. , Phys. Plasmas 23 , 112703 (2016). Copyright 2016 AIP Publishing LLC.
Fig. 6. Areal density distributions at different times, from two 15 µ m Al wires 1 cm in length and with 1 mm spacing. The inset is a schematic of the experiments.35 Reprinted with permission from Wu et al. , Phys. Plasmas 23 , 112703 (2016). Copyright 2016 AIP Publishing LLC.
Fig. 7. (a) Interferometric images from Shot 16054 (two 15 µ m Al wires, 1 cm in length and with 1 mm spacing) at 237 ns, probed in the direction parallel to the wires. (b) Areal density distribution from Shot 16054. (c) Schematic of the stagnation region in the middle of the wires.35 Reprinted with permission from Wu et al. , Phys. Plasmas 23 , 112703 (2016). Copyright 2016 AIP Publishing LLC.
Fig. 8. (a) Qin-1 facility. (b) Short load currents of both the prepulse current and the main current with different time intervals. The charging voltage of the main current generator was ±30 kV.
Fig. 9. (a) Current (black curve), self-emission (red curve), and probing laser (blue curve) waveforms of a 10 × 25 µ m silver wire array with a diameter of 11 mm and a length of 2 cm. (b) Laser interferometric images obtained 436 ns after the current started.29 Reprinted with permission from Wu et al. , Plasma Phys. Controlled Fusion 60 , 075014 (2018). Copyright 2018 IOP Publishing.
Fig. 10. (a) Schematic of the load configuration with a flashover switch and a hollow cylindrical cathode. (b) Laser interferometric images of a cylindrical tungsten wire array 287 ns after the current started. The array consisted of five wires, 15 µ m in diameter, with a polyimide coating of 2.5 µ m thickness.29 Reprinted with permission from Wu et al. , Plasma Phys. Controlled Fusion 60 , 075014 (2018). Copyright 2014 IOP Publishing.
Fig. 11. (a) Areal density distribution calculated from the laser interferometric images shown in Fig. 4 for a 5 × 15 µ m cylindrical tungsten wire array with a 2.5 µ m thickness PI coating at 287 ns. (b) Density profile for a single wire obtained by Abel inversion.29 Reprinted with permission from Wu et al. , Plasma Phys. Controlled Fusion 60 , 075014 (2018). Copyright 2014 IOP Publishing.
Fig. 12. Laser shadowgraphs of two 15 µ m aluminum wires driven by the main current alone. (a) Shot 2017042805, with 3 mm wire spacing, probed 183 ns after the main current started. (b) Shot 2017051304, with 5 mm wire spacing, probed 160 ns after the main current started.29 Reprinted with permission from Wu et al. , Plasma Phys. Controlled Fusion 60 , 075014 (2018). Copyright 2014 IOP Publishing.
Fig. 13. Laser shadowgraphs of two 15 µ m aluminum wires with 3 mm spacing when a prepulse current was applied. The white lines indicate the initial positions of the wires. The probing times and shot numbers are given below the images.29 Reprinted with permission from Wu et al. , Plasma Phys. Controlled Fusion 60 , 075014 (2018). Copyright 2014 IOP Publishing.
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