extreme plasma physics

Electromagnetic-like dark matter self-interaction

The image depicts the interpenetration of two dark e- e+ plasma clouds.
The interaction of dark-plasma clouds leads to the generation of
dark-Weibel magnetic fields, which deflect the particle trajectories.
This process causes the flow velocity of dark matter to slow down.
Magnetic reconnection of QED strength
fields with hard photon radiation emission

Compression of the fields of a magnetic island leads to
enhanced radiative cooling, in turn, further compression,
and thus a runaway process leading to QED effects such
as pair production. This image shows field lines around a
magnetic island colored by strength. Regions where the field
is compressed to more than 125% of the initial strength are
highlighted in green. The emitted hard photons responsible for
radiative cooling and pair production are shown clustered
around the compressed field.
Speiser and Dahu orbits:
 the trappings that heat you up!

Time evolution of two current sheets profiles (colored surfaces)
that move close to each other, increasing their intensities
(from violet to yellow) and merges at the late stage. The lines
represent the trajectories of sample ions. The white ones
(not trapped) do not increase their energy. The colored trajectory,
instead, is trapped bouncing between the confining approaching
current profiles, increasing its kinetic energy from yellow to green,
evolving alternatively from Speiser and Dahu orbits.
Flying cavity: micro-bunching of protons
for electron acceleration

Particle accelerators have been crucial in providing novel insights
in different branches of physics. It is foreseen that the next generation
of particle accelerators will be plasma-driven. Using a laser pulse
in a neutral gas, an electron plasma can be generated which cuts
a long proton bunch in micro-bunches. This allows to generate wakes
for accelerating electrons to higher energies over shorter distances.
QED strength magnetic reconnection
triggered by radiative compression

When magnetic fields approach the Schwinger magnetic field,
radiative cooling triggers compression of the field to even stronger
levels, allowing for QED effects such as pair production to play
an important role. In this video, magnetic field lines, colored by
field strength, are shown to reconnect. Regions where the field
is compressed to more than 125% of the initial strength are highlighted
in green, with the projected field strength displayed behind in blue.
Fountain currents and Biermann fields

The movie illustrates the interaction between an intense
laser pulse (light orange) and an overdense target (blue surface),
generating a strong toroidal magnetic field (dark orange), via the
Biermann battery mechanism. Indeed, as a consequence of the
interaction, the expansion of the plasma (density gradient) occurs
in a direction perpendicular to the electron heating (temperature gradient),
thus giving rise to a non-zero ∇ n x ∇ T and, hence, a magnetic field.
The blue arrows represent the electron current, showing the
so-called fountain effect.
Radiation from charged particles in a
helical trajectory

Charged particles undergoing a helical trajectory have been
shown to emit radiation with very interesting spectral properties.
The Radiation Diagnostic for OSIRIS (RaDiO) captures the radiated
fields in a grid separate from the simulation grid. This animation
follows a relativistic particle (in blue) undergoing a helical trajectory,
the radiation is represented by pink rings that spread out as they
propagate. We then accelerate towards the detector to see the
same radiation as captured by RaDiO.

Welcome to the website of the extreme plasma physics team, the theory and simulation team of the Group for Lasers and Plasmas of the Instituto de Plasmas e Fusão Nuclear at Instituto Superior Técnico.

Our team is funded by the European Research Council through the Advanced Grant "Accelerates" (ERC-AdG2010 no. 267841) and the Advanced Grant “InPairs” (ERC-AdG2015).

Latest News

GoLP members collaborate in the new AWAKE publication

The AWAKE Collaboration, of which EPP members Ricardo Fonseca, Nelson Lopes, Mariana Moreira, Jorge Vieira, Luis O. Silva, and Nuno Torrado are part, has published today an “Analysis of proton bunch parameters in the AWAKE experiment“, in the Journal of Instrumentation. This work offers a precise characterization of the incoming proton bunch parameters, crucial to accurately simulate one of the most important… Read more

EPP GoLP member awarded second place in the APS DPP 2021 Visual Science Communication contest

EPP GoLP member awarded second place in the APS DPP 2021 Visual Science Communication contest during the 63rd Annual Meeting of the APS Division of Plasma Physics, held in a hybrid format on November 8-12 2021. Pablo J. Bilbao was awarded the 2nd place video award in the APS DPP 2021 Visual Science Communication. The video featured the research presented in his poster during the conference,… Read more

Latest Publications

Optimal laser focusing for positron production in laser–electron scattering, New Journal of Physics 23 (2021) p. 115001
Óscar Amaro Marija Vranic
Boosting the performance of Brillouin amplification at sub-quarter-critical densities via reduction of parasitic Raman scattering, Plasma Physics and Controlled Fusion 63 (2021) p. 124003
RMGM Trines, EP Alves, KA Humphrey, R Bingham, RA Cairns, F Fiúza, RA Fonseca, LO Silva
Simulation and experimental study of proton bunch self-modulation in plasma with linear density gradients, Physical Review Accelerators and Beams 24 (2021) p. 101301
P. I. Morales Guzmán et al. (AWAKE Collaboration)
Coherent Emission from QED Cascades in Pulsar Polar Caps, The Astrophysical Journal Letters 919 (2021) p. L4
F Cruz, T Grismayer, A Y Chen, A Spitkovsky, and L O Silva

Electromagnetic-like dark matter self-interaction

Magnetic reconnection of QED strength fields with hard photon radiation emission

Speiser and Dahu orbits: the trappings that heat you up!

Flying cavity: micro-bunching of protons for electron acceleration

QED strength magnetic reconnection triggered by radiative compression

Fountain currents and Biermann fields

Radiation from charged particles in a helical trajectory

Latest News

GoLP members collaborate in the new AWAKE publication

EPP GoLP member awarded second place in the APS DPP 2021 Visual Science Communication contest

Latest Publications

Magnetic reconnection of QED strength
fields with hard photon radiation emission

Speiser and Dahu orbits:
 the trappings that heat you up!

Flying cavity: micro-bunching of protons
for electron acceleration

QED strength magnetic reconnection
triggered by radiative compression

Radiation from charged particles in a
helical trajectory