Search

We report and discuss the results of x-ray radiation measurements in the Sino-Russian joint Z-Pinch experiments on Angara-5-1 facility with a load current of 2.5–3.6 MA. The measurements were conducted by using an x-ray power meter (XRPM) and a time-resolved one-dimensional x-ray imaging system developed in China Academy of Engineering Physics. The experimental results indicate that an x-ray power-platform prior to a main peak and a less intensive sub-peak after the main peak in the waveform exist for the nested-wire array implosions, and the radiation process is relatively faster than that in the case of the single array. Laser shadowgraph of the imploding plasma suggests that the prior power-platform is a result of the collision of the inner-outer plasma layers. The faster radiation process of nested array implosion can be explained by analysing the corresponding result of the time-resolved one-dimensional imaging system, which demonstrates a better axial imploding uniformity and synchronization. In comparison with x-ray diode, the XRPM yields a higher height of x-ray power-platform due to its flat energy response. The sub-peak after the main peak is proposed to be a result of the later-time additional implosion of plasma.

In order to understanding the difference between tungsten single‐wire‐array and tungsten nested‐wire‐array Z‐pinches, we have measured the x‐ray power, the temporal‐spatial distributions of x‐ray radiation from each of the two loads. The measurements were performed with 0.1mm spatial and 1 ns temporal resolutions at 2.5‐ and 3.5‐MA currents. The experimental conditions, including wire material, number of wires, wire‐array length, electrode design, and implosion time, remained unchanged from shot to shot. Analysis of the radiation power profiles suggests that the nested‐wire‐array radiate slightly less x‐ray energy in relatively shorter time interval than the single wire‐array, leading to a much greater x‐ray power in nested‐wire‐array implosion. The temporal‐spatial distributions of x‐ray power show that in both cases, plasmas formed by wire‐array ablation radiate not simultaneously along load axis. For nested‐wire‐array Z‐pinch, plasmas near the anode begin to radiate in 2ns later than that near the cath...

Appearance of generators of electric power of pulse duration of about 100 ns opened new possibilities in classic Z- pinches. First, it is connected with new level of power of this generators. Second, it has become possible to use loads of another size and densities. One of the new tasks studied on powerful installations is generation is generation of pulses of soft x-ray radiation for thermonuclear fusion research. The models of target ignition, developed on systems of laser initiation, determined the nanosecond time as a characteristic time scale of radiation pulse. A program of fast liner compression is developing in TRINITI on Angara 5-1 installation- an 8 module pulse generator of max power of 9TW, pulse rise time of 90 ns, load peak current of 4 MA. The main aim of the program was to investigate a way to create a source of soft x-ray radiation of high intensity for thermonuclear fusion and fundamental research work. A conception of double liner were proposed as a perspective way to ensure a dynamic hohlraum for thermonuclear target irradiation.