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Large Scientific Instruments

ALSYMEX in ITER project

High power lasers

For several decades, ALSYMEX has been involved in the French Megajoule Laser (LMJ) program. Offering innovative solutions and services that meet strict requirements, it is one of CEA's main partners in the laser subsystems:

  • design, production, clean room assembly and on-site integration of laser amplifying sections, transport lines and of key subassemblies of the frequency conversion system,

  • manufacturing of adaptive mirrors and protective panels of the experimental sphere…

ALSYMEX also maintains in operational condition various equipment parts of the laser chains and of the experimental hall, and carries out anti-reflection treatments for all LMJ optics (SOL GEL coating).

This unique expertise, developed within the context of this key project of the French nuclear simulation program, is also used to respond to other demands of large high-power laser projects. ALSYMEX is therefore involved in the European ELI project, in particular in the Romanian pillar, being responsible for:

  • design, manufacture and on-site installation of an interaction chamber between high energy electrons and photons to generate gamma rays;

  • design, manufacture and on-site installation of mechanical and vacuum components of 1 to 10 PW laser beam transport systems.

Particle accelerators

Whether for fundamental research (nuclear and particle physics) or applied research (synchrotrons and neutron sources) ALSYMEX is involved in design and manufacture works for major particle accelerator programs.

It offers design and manufacturing services for mechanical components and subassemblies that comply with restrictive specifications in terms of dimensions, precision, pressure and cleanliness:

  • Assembly, in collaboration with CEA, of the one hundred cryomodules of the superconducting accelerator of the X-FEL free-electron laser under operation in Hamburg. Works were organized around eight special workshops, some in an ISO 4 ultra-clean environment, combining assembly, welding, inspection, vacuum, laser tracker metrology and handling expertise.

  • Design and manufacturing of cryomodule vacuum vessels for the superconducting accelerator of the European ESS neutron source under construction in Lund.

  • Manufacturing and assembly of the induction accelerating structures of a high power X-ray machine


ALSYMEX offers the scientific community mechanical and optomechanical assemblies integrated into ground or on-board telescopes. It has therefore been heavily involved in the construction of a prototype of a small size telescope (SST) for the future CTA European program for exploring the universe in gamma rays: production of metallic reflectors and support structures.

Experimental nuclear reactors

ALSYMEX is involved in the Jules Horowitz experimental fission reactor development program through industrialization, manufacturing and assembly, in a dedicated workshop, of the beryllium reflectors of the reactor.

ALSYMEX is also involved in the main thermo-nuclear fusion programs, and specifically the ITER project. It offers a wide range of innovative solutions and services suited to the harsh environment of this test reactor:

  • Manufacturing of the torus and vacuum vessel cryogenic pumping systems

  • Design, manufacturing, installation and maintenance of the poloidal field coils assembly and handling tools

  • Manufacturing of a prototype ion beam source for plasma heating

  • Design and manufacturing of mechanical components for diagnostics

  • Design and manufacturing of prototypes of the beryllium first wall blanket

  • Design and manufacturing of prototypes of subassemblies of the tungsten divertor

  • Design and manufacturing of plasma facing components of RF heating antennae

  • Design and manufacturing of prototypes of tritium breeding modules