Abstract

Compression of a fiber array with a deuterated target mounted on its axis is studied at the Angara-5-1 facility (3.5 MA, 100 ns). Cylindrical arrays with an initial diameter of 12 mm made from polypropylene fibers with a diameter of 13.4 µm are used. The number of fibers varied from 30 to 120. The target with the density of 0.08–0.2 g/cm³ and the diameter of 1 mm was made on the basis of deuterated polyethylene. A 10‑frame ultra-high-speed X-ray camera, optical slit scans, an integral X-ray pinhole camera, vacuum X-ray diodes, a crystal spectrograph, and neutron detectors are used to measure the plasma parameters in the Z‑pinch. It is found that the dynamics of plasma compression and evolution of local plasma formations, which are sources of neutrons and soft X-ray emission in the energy range of E > 150 eV, depend on the load configuration: the number of fibers, diameter, and density of the deuterated target. Efficient compression of the liner plasma, high concentration and temperature of the compressed target state, as well as the highest neutron yield (8 × 10⁹ neutron/pulse) are observed in experiments with arrays with the fiber number of 60, inside which the target with the diameter of 1 mm and density of 0.2 g/cm³ was placed. The electron density and temperature of the hot plasma in local formations are estimated as n_e ≈ 10²¹ cm^–3, T_e ≈ 1 keV, respectively. The average neutron energy was 2.6 ± 0.2 MeV. The intensity of the plasma formation \(\dot {m}\) [in µg/(cm² ns)] of polypropylene fibers under the action of the discharge current of the facility is determined in experiments with fiber arrays.

中文翻译：

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轴上装有氘代靶材的纤维衬里的压缩动力学研究

摘要

在Angara-5-1设备（3.5 MA，100 ns）上研究了带有氘靶的光纤阵列的压缩情况。使用由直径为13.4 µm的聚丙烯纤维制成的初始直径为12 mm的圆柱阵列。纤维数量从30到120不等。密度为0.08-0.2 g / cm ³且直径为1 mm的靶材是基于氘化聚乙烯制成的。使用10帧超高速X射线照相机，光学缝隙扫描，一体式X射线针孔照相机，真空X射线二极管，晶体光谱仪和中子检测器来测量Z‑中的等离子体参数捏。发现等离子体压缩的动力学和局部等离子体形成的演化是局部中子的形成，在能量范围内是中子和软X射线的发射源。E > 150 eV，取决于负载配置：氘代靶材的纤维数量，直径和密度。在使用纤维数为60的阵列进行的实验中，观察到了衬里等离子体的有效压缩，压缩目标状态的高浓度和高温以及最高中子产率（8×10 ⁹中子/脉冲）。放置直径为1mm，密度为0.2g / cm ^3的样品。在本地地层热等离子体的电子密度和温度被估计为ñ _ë ≈10 ²¹厘米^-3，Ť _È分别为≈1 keV。平均中子能为2.6±0.2 MeV。在设备的放电电流作用下，聚丙烯纤维的等离子体形成强度（ μg/（cm ² ns），单位为微克/（cm ² ns））是在纤维阵列实验中确定的。