Breakdown-prone volume in terahertz wave beams
Breakdown-prone volume in terahertz wave beams
复制标题
太赫兹波束中容易击穿的体积
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
L. Dolin
中科院分区：
文献类型：
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作者：
G. Nusinovich;F. Qiao;D. Kashyn;R. Pu;L. Dolin
这项研究的动机是最近提出的概念，远程检测隐藏的放射性物质的聚焦太赫兹（THz）辐射[V。L。Granatstein和G. S. Nusinovich，J.Appl.Phys.108，063304（2010）]。根据这一概念，高功率THz辐射应该聚焦在场强超过击穿阈值的小光斑中。在这种容易击穿的体积中存在自由电子的情况下，将在那里发生太赫兹放电。然而，这个体积应该很小，以至于在其附近没有电离源的情况下，那里有任何自由电子的概率很低。然后，在一系列太赫兹脉冲中增加的击穿率将表明在聚焦点附近存在隐藏的放射性物质。对于这个概念，重要的是准确地确定由聚焦的THz辐射产生的容易击穿的体积。本文分析了这个问题，首先是单波束的情况，然后是连续波束的情况。
This study was motivated by the recently proposed concept of remote detection of concealed radioactive materials by a focused terahertz (THz) radiation [V. L. Granatstein and G. S. Nusinovich, J. Appl. Phys. 108, 063304 (2010)]. According to this concept, a high-power THz radiation should be focused in a small spot where the field intensity exceeds the breakdown threshold. In the presence of free electrons in such a breakdown-prone volume, a THz discharge will occur there. However, this volume should be so small that in the absence of ionizing sources in its vicinity the probability to have there any free electrons is low. Then, the increased breakdown rate in a series of THz pulses would indicate the presence of hidden radioactive materials in the vicinity of the focused spot. For this concept, it is important to accurately determine the breakdown-prone volume created by a focused THz radiation. This problem is analyzed in this paper, first, for the case of a single wave beam and, then, for the case of c...