强激光与粒子束
2021, 33(1): 012003
Author Affiliations
Abstract
1 Shanghai Institute of Laser Plasma, CAEP, Shanghai 201800, China
2 IFSA Collaborative Innovation Center, Shanghai Jiao Tong University, Shanghai 200240, China
3 Institute of Applied Physics and Computational Mathematics, Beijing 100094, China
Although the streaked optical pyrometer (SOP) system has been widely adopted in shock temperature measurements, its reliability has always been of concern. Here, two calibrated Planckian radiators with different color temperatures were used to calibrate and verify the SOP system by comparing the two calibration standards using both multi-channel and single-channel methods. A high-color-temperature standard lamp and a multi-channel filter were specifically designed for the measurement system. To verify the reliability of the SOP system, the relative deviation between the measured data and the standard value of less than 5% was calibrated out, which demonstrates the reliability of the SOP system. Furthermore, a method to analyze the uncertainty and sensitivity of the SOP system is proposed. A series of laser-induced shock experiments were conducted at the ‘Shenguang-II’ laser facility to verify the reliability of the SOP system for temperature measurements at tens of thousands of kelvin. The measured temperature of the quartz in our experiments agreed fairly well with previous works, which serves as evidence for the reliability of the SOP system.
laser-induced shock waves shock temperature measurement streaked optical pyrometer High Power Laser Science and Engineering
2019, 7(3): 03000e49
Author Affiliations
Abstract
Laboratory of Computational Physics, Institute of Applied Physics and Computational Mathematics, Beijing 100088, China
In this paper we introduce the wide regime equation of state (WEOS) developed in Institute of Applied Physics and Computational Mathematics (IAPCM). A semi-empirical model of the WEOS is given by a thermodynamically complete potential of the Helmholtz free energy which combines several theoretical models and has some adjustable parameters calibrated via some experimental and theoretical data. The validation methods of the equation of state in wide regime are presented using copper as a prototype. The results of the WEOS are well consistent with the available theoretical and experimental data, including ab initio cold curve under compression, isotherm, Hugoniot, off- Hugoniot and sound velocity data. It enhances our confidence in the accuracy of the WEOS, which is very important for the validation and verification of equation of state in high temperature and pressure technology.
Validation Validation Wide-range equation of state Wide-range equation of state Copper Copper Ab initio cold curve Ab initio cold curve Room-temperature isotherm Room-temperature isotherm Hugoniot Hugoniot Velocity of sound Velocity of sound Matter and Radiation at Extremes
2016, 1(2): 123