Transient electric fields in laser plasmas observed by proton streak   deflectometry
  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. 
T. Sokollik, M. Schnuerer, S. Ter-Avetisyan, P.V. Nickles, E.Risse, M.   Kalashnikov, W. Sandner, G. Priebe, M. Amin, T. Ton...