Scaling mechanisms of vapour/plasma shielding from laser-produced plasmas to magnetic fusion regimes
作者: Tatyana SizyukAhmed Hassanein
作者单位: 1Center for Materials under Extreme Environment, School of Nuclear Engineering, Purdue University, West Lafayette, IN 47907, USA
刊名: Nuclear Fusion, 2014, Vol.54 (2)
来源数据库: Institute of Physics Journal
DOI: 10.1088/0029-5515/54/2/023004
原始语种摘要: The plasma shielding effect is a well-known mechanism in laser-produced plasmas (LPPs) reducing laser photon transmission to the target and, as a result, significantly reducing target heating and erosion. The shielding effect is less pronounced at low laser intensities, when low evaporation rate together with vapour/plasma expansion processes prevent establishment of a dense plasma layer above the surface. Plasma shielding also loses its effectiveness at high laser intensities when the formed hot dense plasma plume causes extensive target erosion due to radiation fluxes back to the surface. The magnitude of emitted radiation fluxes from such a plasma is similar to or slightly higher than the laser photon flux in the low shielding regime. Thus, shielding efficiency in LPPs has a peak that...
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  • shielding 屏蔽
  • vapour 蒸汽
  • plasma 深绿玉髓
  • laser 激光
  • erosion 侵蚀
  • produced 出品
  • tokamak 托卡马克
  • tungsten 
  • radiation 辐射
  • dense 致密的