EUV
LITHOGRAPHY
DEPLOYMENT

Extreme Ultraviolet lithography is how the world makes chips at the 7nm node and below. Each ASML EUV machine contains more than 100,000 precision components, operates inside ultra-high vacuum chambers, and uses a CO₂ laser to vaporise tin droplets 50,000 times per second to generate plasma that emits 13.5nm light — a wavelength shorter than the diameter of a DNA strand. No camera has ever been allowed on a fab floor. No photo leaves a Class-100 cleanroom.

Between 2018 and 2021 I was one of a small global team responsible for building these machines from the ground up — installing, commissioning, and qualifying them at Intel, TSMC, and Samsung. This page covers what the work actually involved.

An EUV machine has two primary halves. The Source — where light is generated — and the Scanner — where that light is focused through optics onto silicon wafers to print circuit features. The source side is where almost everything interesting, and everything dangerous, happens.

A high-power TRUMPF CO₂ drive laser fires a pre-pulse and a main pulse at a 27-micron tin droplet as it falls through a vacuum vessel. The droplet is first shaped by the pre-pulse, then vaporised by the main pulse into a plasma cloud. That plasma emits EUV light at 13.5nm, which is collected by a Mo/Si multilayer mirror and directed toward the scanner optics. The whole sequence repeats up to 50,000 times per second.

Managing the tin debris that coats the collector mirror, the hydrogen gas used to chemically reduce that debris, the ultra-high vacuum required throughout, and the thermal load from a laser where only 3–5% of input energy becomes usable light — that is the day-to-day engineering reality of the source side.

Most engineers at ASML specialise in either the mechanical build or the qualification sequence. The two phases are distinct enough that they are normally performed by different people. I started as a Mechanical Install Engineer in 2018 and transitioned to System Integration in 2019 — making me one of only two engineers globally who held deep expertise across both halves of the deployment cycle.

That combination meant I could diagnose integration failures by tracing them back through the physical build — something that required either calling Veldhoven or guessing if you hadn't built the machine yourself.

In 2020, ASML began deploying the NXE:3600 — a next-generation EUV system with roughly 20% new hardware architecture compared to the NXE:3400. Taiwan was one of the first sites. TSMC's fabs were running. The borders were not.

COVID-19 had closed international travel. Engineers were stranded in their home countries. The Taiwan deployments were proceeding with a fraction of the personnel normally required — and the roles that remained were being absorbed by whoever was already on the ground. I was one of those people.

The NXE:3600 deployment required me to operate simultaneously as mechanical installer, integration engineer, and shift lead — a hybrid role normally split across at least three specialists. New hardware modules I had never seen in a physical build were arriving with documentation written in Veldhoven for people who had trained on the system before it shipped. There was no HQ to call. There was a time difference. There was a quarantine hotel. There was a machine that needed to reach Ready for Sequence.

It did. In record time.

EUV field engineering is not maintenance. It is original problem-solving under extreme constraints: high-value equipment, no internet access, limited spare parts, and a customer fab that is billing every hour the machine is not producing wafers. The six areas below represent the technical core of the four years.

ASML and TRUMPF require formal certification before engineers are permitted to work independently on safety-critical systems. These qualifications are earned onsite through assessed practical training — not classroom study. Several of them are unique to ASML and have no direct equivalent outside the company.