用于laser等离子体应用的高密度极化3 He气体喷射靶
A high-density polarized 3He gas-jet target for laser-plasma applications
摘要：
用于核物理实验和极化核聚变研究的激光驱动自旋极化~ 3 He ~（2+）束源需要高密度的极化~ 3 He气体射流靶。这样的目标需要一个磁系统，为核自旋提供永久均匀的保持场，加上一组线圈，用于调整极化的方向。从最大压力为3 bar的运输容器开始，氦气被短时间压缩，并可通过非磁性打开阀和喷嘴注入激光相互作用室，从而形成密度约为几个10^19 cm-3，宽度约为1 mm的射流。靶包括3D调节系统，用于相对于激光焦点精确定位射流。辅助气体系统提供远程目标操作和用Ar气冲洗气体管线，这有助于减少极化损失。介绍了该靶的设计、操作步骤和初步实验结果。
英文摘要：
A laser-driven spin-polarized 3He2+ beam source for nuclear-physics experiments and for the investigation of polarized nuclear fusion demands a high-density polarized 3He gas-jet target. Such a target requires a magnetic system providing a permanent homogeneous holding field for the nuclear spins plus a set of coils for adjusting the orientation of the polarization. Starting from a transport vessel at a maximum pressure of 3 bar, the helium gas is compressed for a short time and can be injected into a laser-interaction chamber through a non-magnetic opening valve and nozzle, thus forming jets with densities of about a few 10^19 cm-3 and widths of about 1 mm. The target comprises a 3D adjustment system for precise positioning of the jet relative to the laser focus. An auxiliary gas system provides remote target operation and flushing of the gas lines with Ar gas, which helps to reduce polarization losses. The design of the target, its operation procedures and first experimental results are presented.
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