Larmor mmWave Systems

The fusion industry needs a spark plug.

$14B+
in private fusion funding raised
Fusion Industry Association, Industry Report 2026
$50B+
projected yearly spend on the fusion supply chain by 2040
Financial Times, June 2026
700MW+
of microwave heating capacity required within a decade
Publicly announced demand
Larmor mmWave Systems
Official spin-off
EPFL
Swiss
Plasma
Center

Larmor motion: the spiral a charged particle traces around a magnetic field line. It's the basic movement that underpins magnetic confinement fusion, the high-power microwave systems used in reactors, and the coupling between the two.

About Larmor

High-power microwave solutions sparking the new nuclear fusion industry.

High-power microwave systems, based on gyrotron technology, are the backbone of magnetic confinement fusion energy.

Heat the plasma to fusion temperature Control plasma instabilities in the reactor
  • →Constrained supply: demand is outpacing production rates
  • →Rising performance demands for next-gen reactors: higher electrical efficiency and output frequency are needed
  • →Heavy integration burden: drawing resources and focus away from reactor developers

Larmor leverages decades of world-class experience from the Swiss Plasma Center at EPFL to deliver integrated microwave solutions, based on gyrotron technology, to solve these bottlenecks threatening fusion deployment.

What we do

Three ways we move the industry forward.

We put decades of experience designing, procuring, and deploying fusion microwave systems at the disposal of fusion developers, drawn from direct involvement in flagship installations including ITER, TCV, EU-DEMO, and DTT.

We're exploring innovative architectures and subcomponents of the gyrotron itself, the core source behind these systems, to push scalability, industrialization, and performance further.

We're extending the same core hardware into new industries beyond fusion, from industrial heating and power transmission to advanced diagnostics, building toward a horizontal hardware layer for industry.

A gyrotron is the source at the core of the microwave systems used to heat and control the plasma inside magnetic confinement fusion devices. It combines high power, in the megawatt range, with high frequency, in the 100 GHz range, in continuous operation, outclassing by far any alternative microwave source above 10 GHz. That advantage is rooted deeply in its basic physics: the interaction between highly energetic electrons and a strong magnetic field, which produces millimetre waves.

Team

Meet the founders.

Mack van Rossem
Mack van Rossem
Co-Founder & CTO
PhD, Experimental Fusion Physics, Swiss Plasma Center - EPFL
MSc, Particle Physics, University of Toronto and University of British Columbia

Mack brings more than a decade of experience in state-of-the-art experimental physics, spanning superconducting technologies, microwave instruments, and particle physics. He was a winter-over responsible for on-site operations at the $300M+ IceCube Neutrino Observatory, located at Amundsen-Scott South Pole Station, before working on millimetre-wave reflectometry diagnostics for magnetic fusion devices. He pairs that technical depth with formal entrepreneurial training and a background owning contracting businesses.

Massimo Carpita
Massimo Carpita
Co-Founder & CEO
PhD, Experimental Fusion Physics, Swiss Plasma Center - EPFL
MSc, Nuclear Engineering, Politecnico di Milano

Massimo has been involved in experimental research at the forefront of fusion energy, focused on the engineering challenges of magnetic confinement devices. He has operated across the major EU fusion devices, particularly the TCV and MAST-U tokamaks, and contributed to flagship EU and US fusion programs, with a specific focus on EUROfusion and ITER. For more than 3 years, he has also lectured on energy technology, policy, and economics at EPFL, and brings formal entrepreneurial training alongside previous experience in his own startup.

The core Larmor team includes world-class experts in microwave, thermo-mechanical, and material engineering, from the EPFL domain and beyond.

An EPFL spin-off.

Larmor is built on more than two decades of Swiss Plasma Center research and development in microwave systems for fusion, spanning design, qualification, integration, and operational experience. That track record includes flagship installations such as ITER, TCV, EU-DEMO, and DTT, and extends to operating FALCON, the high-power millimetre-wave testbed for the European supply chain.

Team at the FALCON facility
EPFL
Swiss
Plasma
Center
Photo credit: Swiss Plasma Center (EPFL) - Experts at work at the FALCON facility

Learn how Larmor can support you today.

We're open to supporting microwave heating needs wherever they arise, as a service partner or technical collaborator, in fusion and beyond.

Contact us
Postal address
EPFL Innovation Park
Bâtiment C
1015 Ecublens
Switzerland
Offices
La Forge, EPFL Innovation Park, Bâtiment C, 1015 Ecublens
Swiss Plasma Center, Building PPH, Station 13, 1015 Ecublens
Liability

We take care in maintaining this site, but make no guarantee that its content is accurate, complete, or up to date. We aren't responsible for the content of external sites we link to; that lies with their own operators.

Copyright

© 2026 Larmor mmWave Systems SA. All rights reserved. Text and images on this site may not be reproduced without written permission, except where a separate credit or licence is stated.

Registration

Société anonyme (SA), registered in the Canton of Vaud, Switzerland.
Company identification number (UID): CHE-193.062.331