Researchers have discovered a way to produce high energy photon
beams. This method makes it possible to produce gamma rays in a highly
efficient way when compared to today’s technique. The obtained energy is a billion times higher than the energy of photons in visible light.
High-intensity gamma rays significantly exceed all known limits of light and will pay the way towards new fundamental studies.
"When we exceed the limit of what is currently possible, we can see
deeper into the basic elements of nature. We can dive into the deepest
part of the atomic nuclei," says Arkady Gonoskov, a researcher at the
Department of Physics at Chalmers University of Technology.
Gamma rays are electromagnetic waves, just like visible light or X-rays, but
with much higher energy. The most energetic gamma rays in the world
could be created by the help of advanced laser physics. When the laser
light is intense enough and all parameters are right, trapped particles
(green) could efficiently convert the laser energy (surfaces in red,
orange and yellow) into cascades of super-high energy photons (pink).
(Arkady Gonoskov)
This new method is the outcome of collaboration is an outcome of
collaboration between Chalmers University of Technology in Sweden,
Institute of Applied Physics and Lobachevsky University in Russia and
the University of Plymouth in the UK. Physicists in different fields
have managed to work out the numerical models and analytic estimates for simulating the ultra-strong gamma rays in a new and somehow unexpected
way.
In normal cases, if a laser pulse is shot at an object, all the
particles scatter. But if the laser light is intense enough and all
parameters are right, the researchers found that the particles are
trapped instead. They form a cloud where particles of matter and
antimatter are created and start to behave in a special and unusual way.
"The cloud of trapped particles efficiently converts the laser energy into cascades of high energy photons - phenomena that is very
fortunate. It's an amazing thing that the photons from this source can
be of such high energy," says Mattias Marklund, a professor at the
Department of Physics at Chalmers.
The discovery is highly relevant for the future large-scale
facilities that are currently under development. The most intense light
sources on earth will be produced in these research facilities that are
as big as football fields.
"Our concept is already part of the experimental program proposed for one such facility: Exawatt Center for Extreme Light Studies in Russia.
We still don't know where these studies will lead us, but we know that
there are yet things to be discovered within nuclear physics, for
example, new sources of energy. With fundamental studies, you can aim at something and end up discovering something completely different - which is more interesting and important," says Arkady Gonoskov.
A paper on this research was published in Physical Review X
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