用于温密物质研究的强流电子束加载技术

能量20 MeV、流强2.5 kA的电子束脉冲可以在数十ns的时间内将靶材料加载至温密物质状态，进而可以开展材料状态方程、电导率以及不透明度等的实验研究工作。介绍了在神龙一号加速器上开展温密物质实验研究的束靶作用方式以及相应的测试技术。对电子束在直径0.3 mm、长1 mm的金属靶丝内的能量沉积和流体动力学响应进行了数值模拟。结果表明:靶丝的温度随着靶材料原子序数的增加而上升，而靶丝内温度分布的均匀性随着原子序数的增加而降低；在电子束加载后40 ns时刻Ta丝内的最高温度可以达到约1.6 eV。

High intensity electron beam as a tool for warm dense matter studies

The target material can be heated to the warm dense matter (WDM) state by irradiation with a 20 MeV, 2.5 kA, 70 ns electron beam, and the measurements of equation of state, electrical conductivity and opacity can be carried out. The beam and target interaction for WDM research on DRAGON-Ⅰ linear induction accelerator and diagnostic technologies are introduced in this paper. Simulation results of the electron energy deposition and hydrodynamic response of 0.3-mm-diameter and 1-mm-length target wires made of different metals are presented. The results show that the temperature rise in the target wires increases and the uniformity of the temperature distribution decreases, as the atomic number increases. For metal with relatively high atomic number, such as tantalum, the temperature in the wire could rise to about 1.6 eV at 40 ns.