利用汤姆逊散射观测非局域热流。

Observation of Nonlocal Heat Flux Using Thomson Scattering.

机构信息

Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, New York 14623, USA.

Department of Mechanical Engineering, University of Rochester, Rochester, New York 14623, USA.

出版信息

Phys Rev Lett. 2018 Sep 21;121(12):125001. doi: 10.1103/PhysRevLett.121.125001.

DOI:10.1103/PhysRevLett.121.125001

PMID:30296110

Abstract

Nonlocal heat flux was measured in laser-produced coronal plasmas using a novel Thomson scattering technique. The measured heat flux was smaller than the classical values inferred from the measured plasma conditions in regions with large temperature gradients and agreed with classical values for weak gradients. Vlasov-Fokker-Planck simulations self-consistently calculated the electron distribution functions used to reproduce the measured Thomson scattering spectra and to determine the heat flux. Multigroup nonlocal simulations overestimated the measured heat flux.

摘要

利用一种新的汤姆逊散射技术测量了激光产生的日冕等离子体中的非局域热流。在大温度梯度区域，测量得到的热流小于从测量的等离子体条件推断出的经典值，与小梯度的经典值一致。Vlasov-Fokker-Planck 模拟自洽地计算了电子分布函数，用于再现测量的汤姆逊散射光谱并确定热流。多群非局域模拟高估了测量的热流。