In May 2026, Reuters reported that ASML expects the first chips made with its next-generation High-NA EUV lithography machines to ship within months, and the company plans to produce roughly 60 EUV tools this year and 80 next year. High-NA EUV — which pushes the numerical aperture from 0.33 to 0.55 — is the technology behind sub-2nm logic and next-generation DRAM, replacing DUV multi-patterning that has stretched wafer costs to unsustainable levels.
What most people outside the industry do not see is that every one of these machines is a vacuum system first, lithography tool second. The entire optical path of an EUV scanner operates in ultra-high vacuum (UHV), and every motion, every flange, every bellows inside that envelope must hold leak-tight integrity for years of 24/7 operation.
Why EUV Demands a Vacuum Envelope at All
EUV light at 13.5 nm is absorbed by virtually every gas molecule. At atmospheric pressure, the beam would be extinguished within millimeters. That is why the source, the collector optics, and the projection optics all live inside a vacuum vessel held typically in the 10-6 to 10-8 mbar range. The vacuum quality directly determines wafer throughput, optical lifetime, and defectivity — a single leak can shut a scanner down for days.
Where Bellows and Feedthroughs Live Inside an EUV Scanner
- Wafer and reticle stages: precise six-axis motion inside the vacuum chamber, connected through edge welded bellows that allow stroke while blocking gas flow between the atmospheric drive side and the UHV side.
- Source and collector: droplet generators, laser entry ports and debris shields need motion and alignment capability under vacuum — typically solved with welded bellows assemblies.
- Vacuum feedthroughs: power, coolant, and signal lines cross the vacuum boundary. Multi-pin and coaxial vacuum feedthroughs carry RF, sensor and cryogenic lines without compromising leak integrity.
- Load locks and transfer ports: every wafer enters and leaves through a load-lock whose slit valve and transfer arm rely on bellows-sealed motion.
What High-NA Changes for Component Suppliers
Moving from 0.33 to 0.55 NA is not just a bigger lens. The physical envelope shrinks, thermal budgets tighten, and component lifetimes are expected to match a 5-7 year tool service cycle. For bellows and feedthrough manufacturers this translates into concrete requirements:
- Higher cycle life: stage bellows can exceed 10 million cycles; fatigue design and diaphragm geometry matter more than catalog ratings.
- Lower leak rates: helium leak rates of 1×10-9 mbar·L/s and below are now routine specifications, verified by mass spectrometer testing on every part.
- Cleanliness: components must be cleanroom-assembled and particle-verified, because a single metal flake inside the optical path is a yield disaster.
- Material stability: AM350, Inconel and 316L are preferred for their fatigue and outgassing behavior; surface finish and heat treatment are part of the specification.
How Alpha Technology Supports Fab-Grade Vacuum Components
Alpha Technology manufactures custom edge welded bellows and vacuum components for the semiconductor industry — helium leak tested to 1×10-9 mbar·L/s, cleanroom assembled, and available in SS316L, AM350, Inconel and Hastelloy. Our custom high-vacuum bellows are used in stage motion, valve actuation and load-lock transfer applications where cycle life and leak integrity are non-negotiable.
For engineers designing the next generation of EUV-adjacent hardware, the bellows design guide covers the fatigue, spring-rate and envelope trade-offs, and the material guide compares 316L, AM350 and Inconel for exactly these duty cycles.
FAQ
What vacuum level do EUV machines operate at?
Typically 10-6 to 10-8 mbar in the optical path, with load locks cycling between atmosphere and vacuum on every wafer transfer.
Why can’t standard rubber seals be used in EUV?
EUV optics are damaged by hydrocarbons and outgassing. Metal-sealed components with welded bellows avoid elastomer contamination entirely.
How long do edge welded bellows last in fab service?
Properly designed bellows in stage and valve applications routinely exceed 10 million cycles; Alpha Technology validates fatigue life on custom assemblies.
What leak rate is required for EUV components?
Industry-standard acceptance is helium leak rate ≤ 1×10-9 mbar·L/s, verified with calibrated mass spectrometer leak detectors.
Planning a vacuum component for a fab tool? Contact Alpha Technology with your envelope, stroke and leak-rate requirements — our engineers respond with a design within 48 hours.