Properties of a vacuum ultraviolet laser created plasma sheet for a microwave reflector
作者:
W. Shen,
J. E. Scharer,
N. T. Lam,
B. G. Porter,
K. L. Kelly,
期刊:
Journal of Applied Physics
(AIP Available online 1995)
卷期:
Volume 78,
issue 12
页码: 6974-6979
ISSN:0021-8979
年代: 1995
DOI:10.1063/1.360773
出版商: AIP
数据来源: AIP
摘要:
A 193 nm excimer laser and a custom fabricated cylindrical lens system is used to produce a plasma sheet of 8 cm×30 cm×0.4 cm in tetrakis(dimethylamino)ethylene (TMAE), a low ionization energy organic gas. Plasma density variation due to photon absorption is studied by scanning the filling pressure of TMAE between 12 and 150 mTorr. A high density (n≥2.0×1013cm−3), low temperature (Te≊0.8 eV) plasma sheet of 4 mm thickness is obtained with less than 50% spatial density variation over the 30 cm axial length. Charge recombination is found to be the dominant process for t≤1.2 &mgr;s with the plasma diffusion playing a perturbational role. A one‐dimensional plasma model is utilized to model the experimental plasma data by treating the diffusion as a perturbation. This study shows that the recombination coefficient is 1.8±0.1×10−7cm3 s−1and the diffusion coefficient is 2.8±0.4×104cm2 s−1. The plasma sheet has attractive properties for a microwave agile mirror. ©1995 American Institute of Physics.
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