Clapp J T, Mancini R C, Harding E C, Schaeuble M A, Harvey-Thompson A J
Department of Physics, University of Nevada, Reno, 1664 N Virginia St, Reno, Nevada 89557, USA.
Sandia National Laboratories, 1515 Eubank Blvd SE, Albuquerque, New Mexico 87123, USA.
Rev Sci Instrum. 2022 Oct 1;93(10):103532. doi: 10.1063/5.0101860.
In a series of Magnetized Liner Inertial Fusion (MagLIF) experiments performed at the Z pulsed power accelerator of Sandia National Laboratories, beryllium liners filled with deuterium gas pressures in the 4-8 atm range and a tracer amount of krypton were imploded. At the collapse of the cylindrical implosion, temperatures in the 1-3 keV range and atom number densities of ∼10 cm were expected. The plasma was magnetized with a 10 T axial magnetic field. Krypton was added to the fuel for diagnosing implosion plasma conditions. Krypton K-shell line emission was recorded with the CRITR time-integrated transmission crystal x-ray spectrometer. The observation shows n = 2 to n = 1 line emissions in B-, Be-, Li-, and He-like Kr ions and is characteristic of the highest electron temperatures achieved in the thermonuclear plasma. Detailed modeling of the krypton atomic kinetics and radiation physics permits us to interpret the composite spectral feature, and it demonstrates that the spectrum is temperature sensitive. We discuss temperatures extracted from the krypton data analysis for experiments performed with several filling pressures.
在桑迪亚国家实验室的Z脉冲功率加速器上进行的一系列磁化内衬惯性聚变（MagLIF）实验中，对填充有4-8个大气压范围内的氘气压力和微量氪的铍内衬进行了内爆。在圆柱形内爆坍塌时，预计温度在1-3千电子伏特范围内，原子数密度约为10厘米。等离子体由10特斯拉的轴向磁场磁化。向燃料中添加氪以诊断内爆等离子体条件。用CRITR时间积分透射晶体X射线光谱仪记录氪K壳层线发射。观测结果显示了类硼、类铍、类锂和类氦氪离子中从n = 2到n = 1的线发射，这是热核等离子体中达到的最高电子温度的特征。对氪原子动力学和辐射物理学的详细建模使我们能够解释复合光谱特征，并表明该光谱对温度敏感。我们讨论了从氪数据分析中提取的温度，这些温度来自于在几种填充压力下进行的实验。
