强激光与粒子束
2021, 33(1): 012002
强激光与粒子束
2021, 33(2): 022001
Author Affiliations
Abstract
1 Key Laboratory of Pulsed Power, Institute of Fluid Physics, China Academy of Engineering Physics, P.O. Box 919-108, Mianyang 621999, China
2 Southwest University of Science and Technology, Mianyang City, Sichuan Province 621010, China
Jets are commonly observed astrophysical phenomena. To study the x-ray emission characteristics of jets, a series of radial foil Z-pinch experiments are carried out on the Primary Test Stand at the Institute of Fluid Physics, China Academy of Engineering Physics. In these experiments, x-ray emission ranging from the soft region (0.1–10 keV) to the hard region (10 keV–500 keV) is observed when the magnetic cavity breaks. The radiation flux of soft x-rays is measured by an x-ray diode and the dose rate of the hard x-rays by an Si-PIN detector. The experimental results indicate that the energy of the soft x-rays is several tens of kilojoules and that of the hard x-rays is ～200 J. The radiation mechanism of the x-ray emission is briefly analyzed. This analysis indicates that the x-ray energy and the plasma kinetic energy come from the magnetic energy when the magnetic cavity breaks. The soft x-rays are thought to be produced by bremsstrahlung of thermal electrons (～100 eV), and the hard x-rays by bremsstrahlung of super-hot electrons (～mega-electron-volt). These results may be helpful to explain the x-ray emission by the jets from young stellar objects.
Matter and Radiation at Extremes
2020, 5(1): 014401
Author Affiliations
Abstract
Key Laboratory of Pulsed Power, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621999, China
Pulsed power technology, whereas the electrical energy stored in a relative long period is released in much shorter timescale, is an efficient method to create high energy density physics (HEDP) conditions in laboratory. Around the beginning of this century, China Academy of Engineering Physics (CAEP) began to build some experimental facilities for HEDP investigations, among which the Primary Test Stand (PTS), a multi-module pulsed power facility with a nominal current of 10 MA and a current rising time ~90 ns, is an important achievement on the roadmap of the electro-magnetically driven inertial confinement fusion (ICF) researches. PTS is the first pulsed power facility beyond 10 TW in China. Therefore, all the technologies have to be demonstrated, and all the engineering issues have to be overcome. In this article, the research outline, key technologies and the preliminary HEDP experiments are reviewed. Prospects on HEDP research on PTS and pulsed power development for the next step are also discussed.
High energy density physics Inertial confinement fusion Z-pinch Isentropic compression Hypervelocity flyer launch Pulsed power Primary Test Stand Matter and Radiation at Extremes
2016, 1(1): 48
中国工程物理研究院 流体物理研究所, 脉冲功率科学与技术重点实验室, 四川 绵阳 621999
介绍了一种用于软X射线辐射能量测量的电阻式薄膜量热计。利用电流的欧姆热效应对薄膜量热计的灵敏度进行了标定。在有基底薄膜的标定过程中, 采用一维热扩散模型, 考虑了金属薄膜向基底的传导热损失。利用电阻式薄膜量热计对聚龙一号装置钨丝阵Z箍缩产生的软X射线进行了测量, 并与平响应X射线二极管(XRD)探测器的测量结果进行了比较。实验结果表明, 电阻式薄膜量热计测量的软X射线辐射能量和辐射功率与平响应XRD探测器结果在测量不确定度范围内合理地一致。
软X射线 薄膜量热计 Z箍缩 等离子体 X射线诊断 soft X-ray bolometer Z pinch plasmas X-ray diagnostics 强激光与粒子束
2016, 28(7): 075007
中国工程物理研究院 流体物理研究所, 脉冲功率科学与技术重点实验室, 四川 绵阳 621900
介绍了“聚龙一号”上使用的一种由金阴极X光二极管(XRD)和具有特殊构型的复合金滤片构成的平响应XRD探测器,测量软X光通量的标定和实验情况。该探测器的灵敏度在北京同步辐射的4B7B束线站和4B7A束线站标定。标定的灵敏度显示,该探测器对0.1~4 keV之间的X光具有近似平坦的响应曲线。根据标定情况和探测器的谱响应特性,给出了目前该探测器在用于Z箍缩产生的软X光通量诊断中的测量不确定度为12%。在单层钨丝阵Z箍缩实验中,平响应XRD探测器测得Z箍缩产生的X光功率峰值达到52 TW,能量达540 kJ。在动态黑腔实验中,布置在径向和轴向的两套平响应XRD探测器被用于建立径向辐射功率波形和轴向辐射功率波形之间的时间关联。在典型的动态黑腔实验中,测得轴向辐射功率峰值出现在径向辐射功率前约1.2 ns。
平响应XRD探测器 丝阵Z箍缩 软X光通量 探测器标定 动态黑腔 flat spectral response XRD wire array Z-pinch soft X-ray flux detector calibration dynamical hohlraum 强激光与粒子束
2016, 28(4): 045009
1 中国工程物理研究院 流体物理研究所, 脉冲功率科学与技术重点实验室, 四川 绵阳 621999
2 中国工程物理研究院 激光聚变研究中心, 四川 绵阳 621999
介绍了基于聚龙一号装置的Z箍缩诊断和实验布局,分析了丝数132~300、丝直径5~10 μm、丝阵直径13~30 mm的单/双层钨丝阵Z箍缩内爆动力学过程和软X射线辐射特性规律。研究表明,钨丝阵等离子体的停滞时间与零维薄壳模型计算的停滞时间一致,内爆轨迹存在偏离,丝阵等离子体内爆开始前以丝烧蚀为主,内爆开始时间约为总内爆时间的67%; 随着负载质量和半径的增大,负载电流、内爆停滞时间和X射线辐射脉冲半高宽也相应增加,X射线辐射峰值功率减小。双层钨丝阵的内爆均匀性和一致性优于单层丝阵,其辐射峰值功率明显高于单层钨丝阵,但单/双层钨丝阵辐射产额基本相当,能量转换效率约为15%。此外,还初步讨论了单层钨丝阵驱动的低密度泡沫动态黑腔辐射功率波形特征及其与纯钨丝阵内爆辐射的差异。
Z箍缩 钨丝阵内爆 动态黑腔 辐射特性 Z-pinch tungsten wire array implosion dynamic hohlraum radiation characteristics 强激光与粒子束
2016, 28(2): 025006
中国工程物理研究院 流体物理研究所, 四川 绵阳 621900
成功研制了用于“聚龙一号”装置上Z箍缩实验中等离子体图像诊断的三通道不同光子能段的X射线积分成像系统。该系统主要由针孔阵列调节组件、X射线真空飞行管道、X射线分光器件及成像板组成，各通道的光谱响应分别为277 eV，小于700 eV和大于800 eV，其对应的成像针孔直径为100，100和50 μm，成像放大倍率2倍，成像空间分辨率均优于0.2 mm。在“聚龙一号”装置上完成了该成像系统的性能考核，获取了不同光子能段的等离子体时间积分图像。结果表明，该成像系统满足“聚龙一号”装置上Z箍缩实验的诊断需求，在提升了单台相机光谱响应范围的同时提高了低能段图像的空间分辨率。
针孔积分相机 多层镜 平面反射镜 Z箍缩 聚龙一号 pinhole time-integrated camera multilayer mirror planar mirror Z-pinch primary test stand 强激光与粒子束
2015, 27(11): 112004
1 中国工程物理研究院 流体物理研究所, 四川 绵阳 621999
2 中国科学技术大学 近代物理系, 合肥 230026
利用FOI-PERFECT程序对X箍缩进行了3D数值模拟研究,给出了X箍缩的物理图像和动力学过程,探讨了Z箍缩中出现磁重联的可能性,并指出如果双丝Z箍缩中能够出现磁重联,那么X箍缩是更有利于磁重联出现的位形,并且,X箍缩中出现多重X射线暴的一个可能原因是z轴上多个位置出现磁重联。
X箍缩 辐射磁流体力学 数值模拟 磁重联 X-pinch radiation MHD numerical simulation magnetic reconnection 强激光与粒子束
2015, 27(1): 010102
1 中国工程物理研究院 流体物理研究所, 脉冲功率科学与技术重点实验室, 四川 绵阳 621999
2 中国科学技术大学 近代物理系, 合肥 230026
采用FOI-PERFECT程序对局域欧姆加热主导的动态烧蚀进行了数值模拟研究,定量诊断并比较了烧蚀率、先驱电流和烧蚀时间,考查烧蚀阶段之初的丝等离子体的直径和丝阵的丝数对烧蚀的影响,结果表明,在等离子体流建立后,随丝数或者丝径的增加,烧蚀率增大,先驱电流减少,烧蚀时间减小。
Z箍缩 烧蚀 磁流体力学 数值模拟 Z-pinch ablation magnetohydrodynamics numerical modeling 强激光与粒子束
2014, 26(4): 045050
