Temperature Measurements of Dense Plasmas by Detailed Balance

Holl, A ; Redmer, R ; Ropke, G ; Reinholz, H ; Thiele, R ; Fortmann, C ; Forster, E ; Cao, L ; Tschentscher, T ; Toleikis, S ; Glenzer, S H

Lawrence Livermore National Laboratory

关键词: Temperature Measurement;    Asymmetry;    70 Plasma Physics And Fusion Technology;    Inertial Confinement;    Thomson Scattering;   

DOI  :  10.2172/883600
RP-ID  :  UCRL-TR-220089
RP-ID  :  W-7405-ENG-48
RP-ID  :  883600

美国|英语

来源: UNT Digital Library

【 摘 要 】

Plasmas at high electron densities of n{sub e} = 10{sup 20} - 10{sup 26} cm{sup -3} and moderate temperatures T{sub e} = 1 - 20 eV are important for laboratory astrophysics, high energy density science and inertial confinement fusion. These plasmas are usually referred to as Warm Dense Matter (WDM) and are characterized by a coupling parameter of {Lambda} {approx}> 1 where correlations become important. The characterization of such plasmas is still a challenging task due to the lack of direct measurement techniques for temperatures and densities. They propose to measure the Thomson scattering spectrum of vacuum-UV radiation off density fluctuations in the plasma. Collective Thomson scattering provides accurate data for the electron temperature applying first principles. Further, this method takes advantage of the spectral asymmetry resulting from detailed balance and is independent of collisional effects in these dense systems.