Alsymex, a subsidiary of the Alcen group, is a prominent French company renowned for its expertise in the design, engineering, manufacturing, assembly, and on-site installation of complex, high-precision mechanical systems and vacuum components. With over 30 years of experience, Alsymex serves highly demanding sectors including nuclear fusion (e.g., ITER project), particle accelerators (e.g., CERN), space exploration, aeronautics, and advanced industrial applications. Their core competencies encompass ultra-high vacuum (UHV) technology, cryogenics, specialized welding, metrology, and the management of large-scale, technologically challenging projects.
Serves as Alsymex's primary operational hub, encompassing design offices, advanced manufacturing workshops, assembly halls, clean rooms, and testing facilities for all its projects.
State-of-the-art facilities including 6,500 m² of workshops, large-scale machining capabilities, specialized welding (TIG, MIG, Plasma, EB), clean rooms (ISO 5 to ISO 8), advanced metrology equipment (laser trackers, CMMs), and UHV testing equipment.
A highly technical and collaborative environment focused on innovation, precision engineering, quality, and solving complex challenges. The culture encourages continuous learning and expertise development, driven by participation in cutting-edge international projects.
The Igny headquarters is crucial for Alsymex's ability to undertake and deliver end-to-end solutions for large, technologically intensive projects, solidifying its reputation as a key partner for major scientific and industrial players worldwide.
Alsymex's primary operations, including design, engineering, and manufacturing, are centralized at their headquarters in Igny, France. However, the company maintains a strong global presence through its project-based work, deploying teams for on-site assembly, installation, and commissioning at customer facilities across the world. They have contributed to major international projects in Europe (e.g., ITER in France, CERN in Switzerland/France), Asia, and North America, serving clients in the fusion energy, particle physics, space, and advanced industry sectors.
11 rue Ampère, ZI des Béthunes
Igny
Île-de-France
France
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As of April 2025, ALSYMEX' leadership includes:
ALSYMEX has been backed by several prominent investors over the years, including:
There have been no major, publicly announced executive hires or exits specifically for Alsymex in the mainstream news over the last 12 months. Leadership within Alsymex, as a subsidiary of Alcen, appears stable. Any significant changes would likely be communicated through the Alcen group.
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Alsymex, as part of the Alcen group, likely utilizes standard professional email formats. Common patterns for French technology companies often include [first_initial][lastname]@[domain] or [firstname].[lastname]@[domain].
f[last]@alsymex.com (e.g., jdupont@alsymex.com) or [first].[last]@alsymex.com (e.g., jean.dupont@alsymex.com)
Format
dlevaillant@alsymex.com
Example
80%
Success rate
ITER Newsline • March 29, 2023
The ITER Organization has signed its largest manufacturing contract for Diagnostics Port Plugs with Alsymex, part of the Alcen Group. This contract covers the design finalization and manufacturing of 11 Equatorial Port Plugs and 3 Upper Port Plugs, which are complex structures that will house diagnostic systems essential for monitoring the ITER plasma....more
Alsymex Website News • July 14, 2023
Alsymex announced the successful delivery of the first Sector Sub-Assembly Tool (SSAT-1) for the ITER project. This critical tool will be used for the pre-assembly of the ITER vacuum vessel sectors. This achievement highlights Alsymex's expertise in manufacturing large and complex mechanical systems for the fusion energy sector....more
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