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A D V A N C E D
M A T E R I A L S
&
P R O C E S S E S |
O C T O B E R
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Illustration of SLAC’s new apparatus for ultrafast electron diffraction. Courtesy of SLAC.
more complete picture that will help
researchers better understand and
possibly control important ultrafast
processes in complex systems ranging
from magnetic data storage devices to
chemical reactions.
The superior performance of the
new UED system is due to a very stable
“electron gun” originally developed for
SLAC’s x-ray laser Linac Coherent Light
Source (LCLS). This electron source
produces highly energetic electrons,
packed into extremely short bunches.
It generates 120 of these bunches every
second, resulting in a powerful electron
beam that is used to probe objects on
the inside.
The method works because par-
ticles have a second nature: They also
behave like waves. Because electron
bunches in SLAC’s UED instrument are
extremely short, they reveal changes
that occur in less than 100 femtosec-
onds. Electrons also provide a path to
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studies that are very challenging to per-
form with x-rays. The team’s ultimate
goal is to turn UED into an ultrafast elec-
tron microscope, an instrument that
would show details too small to be seen
with an optical microscope. Existing
electron microscopes can already cap-
ture events in 10 billionths of a second,
but with SLAC’s instrument, research-
ers hope to push the speed limit to
processes that are 1000 times faster.
.