用质子条纹偏折术观测laser等离子体中的瞬态电场
Transient electric fields in laser plasmas observed by proton streak deflectometry
摘要：
一种新的质子成像技术的应用，它允许连续的时间记录的电场在几纳秒的时间窗口。这种“质子条纹偏折法”被用来研究强激光（~ 10^17 W/cm ^2）辐照箔的瞬态电场。我们发现，这些绝对峰值高达10^8 V/m的场在毫米级横向延伸，并在纳秒级持续时间内衰减。因此，它们比（~ ps）激光激发持续更长时间，并且远远超出激光照射焦点。
英文摘要：
A novel proton imaging technique was applied which allows a continuous temporal record of electric fields within a time window of several nanoseconds. This "proton streak deflectometry" was used to investigate transient electric fields of intense (~ 10^17 W/cm^2) laser irradiated foils. We found out that these fields with an absolute peak of up to 10^8 V/m extend over millimeter lateral extension and decay at nanosecond duration. Hence, they last much longer than the (~ ps) laser excitation, and extend much beyond the laser irradiation focus.
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