Physicists have perfected a method of laser electron acceleration

Physicists from
The UK was able to accelerate electrons with energy 35 MeV
with the help of laser pulses and the waveguide with a dielectric coating of the walls. Scientists
slightly increased the starting energy of the electrons, but due to the extremely
short exposure area made up of the acceleration in two megaelectronvolt on the meter. The method used by the researchers, almost
does not affect the transverse structure of the beam particles, which is highly valued in
accelerator physics, and in the future this technique can be used in full
linear accelerators of new generation. Article published in the journal Nature Photonics.

For more than
one hundred years of development accelerators, scientists have learned to accelerate elementary particles to
huge energies, but due to fundamental constraints on the rate of acceleration each
a new generation of complex experimental setups increasing in price and
sizes. For linear accelerators one of the main restrictions is the top
the limit values of the electric field: more than a few
tens of megavolts per meter could not be obtained due to a number of technical
problems, including breakouts.

To overcome
this limitation requires the development of fundamentally new techniques
acceleration of the charged particles, which is impossible to achieve stronger
fields, and therefore more rapid acceleration. Perhaps the main candidates
the title of the new generation of accelerators are setup in which to
acceleration of particles used powerful laser pulses. For example, in the Wake
acceleration powerful lasers are used to generate oscillations in the plasma, which are already accelerated electrons. This method is now
one of the Champions on a combination of rate and magnitude of acceleration: with the help of physics learnedconsistently
to accelerate electrons to 2 GeV in 10 meters, and smaller
range the rate of acceleration reached 100 GeV per meter.

However, Morgan
Hibberd (Morgan Hibberd) from the University of Manchester and his colleagues used a powerful
laser for direct effects on flying through its beam electrons. In this
method, charged particles interact directly with electromagnetic waves
fields, which are generated by the laser, thereby acquiring energy. To implement this
the method of acceleration on the electromagnetic field imposed a number of conditions: it must
to be highly focused, and its phase velocity must match the velocity
movement of electrons to avoid desync. To achieve these
the conditions the authors used a powerful terahertz laser, the beam of which with
special records transferred to suitable for stable acceleration fashion TEM01 and focus a parabolic
mirror, and a quartz waveguide with a dielectric coating the inner
walls. Changes in the electron energy physics observed by scintillation
of the screen on which different angles flew rejected the dipole magnet, the particles of different speeds.

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