High‐Field Conduction Currents in Liquid n‐Hexane under Microsecond Pulse Conditions
High‐Field Conduction Currents in Liquid n‐Hexane under Microsecond Pulse Conditions
复制标题
微秒脉冲条件下液体正己烷中的高场传导电流
DOI：
10.1149/1.2427734
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发表时间：
1960
影响因子：
3.9
通讯作者：
A. Sharbaugh
中科院分区：
文献类型：
--
作者：
P. Watson;A. Sharbaugh
一种新的脉冲技术被开发出来用于测量由毫秒、微秒和亚微秒脉冲电压引起的传导电流。利用这种方法，研究了液体正己烷在0.1 ~ 1.4 Mv/cm的电场和2.5 ~ 25 mils的间隙下的传导电流。在低于1.25 mv/cm的电场中没有获得电子倍增的证据，但在高于1.3 mv/cm的电场中有开始a过程的边缘迹象。在接近击穿的磁场中，测量到了极大的电流值；作者的计算表明，这些电流起源于阴极表面的微观点。由于大的电流密度和高的局部场，在这些突起的尖端输入到液体的能量可能高达107瓦/立方厘米。这可能导致液体局部汽化，甚至在几微秒内形成气泡。如果一个气泡是这样形成的，那么液体的分解可以很容易地通过气泡在间隙上的随后增长来形成一个火花通道。
A novel pulse technique has been developed for measuring conduction currents due to millisecond, microsecond, and submicrosecond pulses of voltage. Using this method, a study has been made of conduction currents in liquid n-hexane at fields from 0.1 to 1.4 Mv/cm and at gap spacings from 2.5 to 25 mils. No evidence for electron multiplication was obtained at fields below 1.25 mv/cm, but there are marginal indications of the beginning of an a-process above 1.3 Mv/cm.At fields near breakdown extremely large values of current have been measured; the authors' calculations indicate that these currents originate at microscopic points on the cathode surface. Because of the large current density and the high local field, the energy input to the liquid at the tips of these asperities is possibly as large as 107 watts/cm 3. This could lead to local vaporization of the liquid to form a bubble even in times as short as a few microseconds. If a bubble is so formed, then breakdown of the liquid could readily proceed by subsequent growth of the bubble across the gap to form a spark channel.