LSI facility

CONTACT & how to come

SIRIUS is an electron accelerator platform of the LSI Laboratory which offers the possibility to irradiate with high electron energy/current and low temperature. Since it came into operation, the accelerator is used as a powerful means of studying, analysing and designing a wide range of materials.

Notice that financial participation is due for the irradiations and contact the facility at before submitting your EMIR&A project.


The important particularity of SIRIUS :
The NEC Pelletron accelerator of adjustable energy (150 KeV - 2.5 MeV) and current (10 nA - 50 µA).
The accelerator is equipped with several irradiation set-ups which allow measurements even at low temperatures (20 K).
The two beamlines of the platform allowed to place the beam in two different experiment in a short time.

NEC Pelletron accelerator

Experiment/End Beamline available :

Current beam : < 40 µA
300 K < T < 600 K
Standard sample : Ø 28 mm
Atmosphere (Air, Vacuum, Helium, Argon)
Water-cooled sample holder
Current beam : few µA
T = 300 K
Atmosphere (Air, Helium, Argon)
Translation along one axis (12 cm)
Height : 2 cm
Current beam : < 40 µA
100 K < T < 300 K
Translation along x and y axis
Sample : 180x130 mm2
Current beam : < 5 µA (optional up to10 µA)
T = 20 K
Standard Sample : Ø 5 mm
Cooling power > 25 W


- Some in situ measurement are available on SIRIUS

Electrical : conductivity, Hall effect, I-V curves
Optics : absorption, photoluminescence (with time resolution), cathodoluminescence
Structural : Raman
Magnetic : Electron Paramagnetic Resonance (post-irradiation, in situ under development)

Application fields :

  • Glasses
  • Polymers
  • Semiconductors
  • Ceramics
  • Metal
  • Superconductors
  • Nuclear fuel
  • Solid state physics
  • Solar cell
  • Cements
  • others

CONTACT & how to come

Ecole Polytechnique - Laboratoire des Solides Irradiés
F-91128 Palaiseau

Director :
Michèle Raynaud
+ 33 1 69 33 45 20

Contact person :
Antonino ALESSI
tel : + 33 1 69 33 45 22

For your coming : Control barriers are installed at entrances to the campus. Visitors should go to the main entrance to obtain a temporary pass. The laboratory is under control access. Visitors without badges must phone their partner.

For more information See theLSI website :


Recent publications

  • C. Weiss et al. Electron and proton irradiation effect on the minority carrier lifetime in SiC passivated p-doped Ge wafers for space photovoltaics, Solar Energy Materials and Solar Cells, 209, 110430, 2020.
  • N. Ollier et al. Relaxation study of pre-densified silica glasses under 2.5MeV electron irradiation. Scientific Reports 9, 1227, 2019.
  • M.-N. de Noirfontaine et al. An X-ray powder diffraction study of damage produced in Ca(OH)2 and Mg(OH)2 by electron irradiation using the 2.5 MeV SIRIUS accelerator, Journal of Nuclear Materials, 509 78-93, 2018.
  • K. Cho et. Using controlled disorder to probe the interplay between charge order and superconductivity in NbSe2, Nature Communications 9, 2796, 2018.
  • H. Deng et al. High-temperature quantum anomalous Hall regime in a MnBi2Te4/Bi2Te3 superlattice, Nature Physics (2020).