Andromede is a 4 MV NEC Pelletron ion accelerator.

The voltage can be adjusted from 500 kV to 4 MV. The terminal of this accelerator is designed to receive two kinds of sources, an electron cyclotron resonance (ECR) source and a liquid metal ion source (LMIS). The ECR source is a Microgan manufactured by Pantechnik with a RF frequency of 10 GHz and a magnetic well adjustement allowing the production of multi-charged atomic ions or molecular ions. The LMIS column is an OrsayPhysics filtered column, incorporating the mass selection of ions delivered by the source named NAPIS (Nano Particles Ion Source) which produced atomic ions, cluster and metallic nanoparticles.

There are three experimental lines behind the analysis magnet, two of them equipped with diagonostic ion beam for determining position, size and intensity :

  • A 90° line for selecting atomic and molecular beams of ions with mass-to-charge ratios of less than 70 (e.g. Germanium, Ge+) for an acceleration voltage of 4 MV.
  • A beam line at 1°29 dedicated mainly to macromolecules and gold cluster beams.
  • A third beam line can be made available at 70°.

For more information: see here

Thanh Loan Lai, Dominique Jacquet, Isabelle Ribaud, Michael John Eller, Dmitriy Verkhoturov, Emile Albert Schweikert, Luiz Henrique Galvão Tizei, Fuhui Shao, Suheyla Bilgen, Bruno Mercier, Gael Sattonnay, Serge Della Negra, Enhanced sputter and secondary ion yields using MeV gold nanoparticle beams delivered by the Andromede facility, Journal of Vacuum Science & Technology B 38 (2020) 044008