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Mapping transient electric fields with picosecond electron bunches
#MMPMID26554022
Chen L
; Li R
; Chen J
; Zhu P
; Liu F
; Cao J
; Sheng Z
; Zhang J
Proc Natl Acad Sci U S A
2015[Nov]; 112
(47
): 14479-83
PMID26554022
show ga
Transient electric fields, which are an important but hardly explored parameter
of laser plasmas, can now be diagnosed experimentally with combined ultrafast
temporal resolution and field sensitivity, using femtosecond to picosecond
electron or proton pulses as probes. However, poor spatial resolution poses great
challenges to simultaneously recording both the global and local field features.
Here, we present a direct 3D measurement of a transient electric field by
time-resolved electron schlieren radiography with simultaneous 80-?m spatial and
3.7-ps temporal resolutions, analyzed using an Abel inversion algorithm. The
electric field here is built up at the front of an aluminum foil irradiated with
a femtosecond laser pulse at 1.9 × 10(12) W/cm(2), where electrons are emitted at
a speed of 4 × 10(6) m/s, resulting in a unique "peak-valley" transient electric
field map with the field strength up to 10(5) V/m. Furthermore, time-resolved
schlieren radiography with charged particle pulses should enable the mapping of
various fast-evolving field structures including those found in plasma-based
particle accelerators.
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