This assembly demonstrates what a high-performance RF feedthrough / RF coupler window really requires:
The component must combine high-frequency capability, vacuum tightness, and mechanical stability — even under thermal and process-related stress.

The technical challenge starts with the material combination:

• Alumina ceramic (Al₂O₃) for electrical insulation
• OFHC copper for RF-compatible conductivity and high thermal performance
• Stainless steel for structural integrity and vacuum-compatible integration

The real complexity, however, lies in joining these materials.
Creating a reliable ceramic-copper-stainless steel assembly requires precise control of:

• material compatibility
• metallization
• joint gap design
• temperature profile
• process stability
• leak tightness and repeatability

A key feature of this project is the circumferential brazing joint.

While comparable applications have often relied on end-face brazing, NTG can now also reliably realize the far more demanding circumferential brazing process.
The advantage of circumferential brazing lies in the joint design across a continuous peripheral interface. This can provide important design and manufacturing benefits, especially in terms of load distribution, joint stability, vacuum tightness, and integration into complex assemblies.

In particular, brazing ceramic-to-metal joints is one of the most demanding disciplines in advanced joining technology. Different coefficients of thermal expansion and strict vacuum requirements leave no room for compromise.
This is exactly the kind of complexity we master at NTG.

We manufacture precision brazed assemblies for demanding technical applications — reliable, repeatable, and engineered for performance.

🌐 www.ntg.de

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A tradition that brings us together 🐟

It has been a tradition for many years: on Aschermittwoch, herring is served in the NTG canteen.

On February 18, it was that time again—a small, simple tradition that means so much. We took a break from work for a moment, ate together, laughed, and enjoyed each other’s company.

Because in the end, it always turns out that
food brings people together. 🤝

Manufacturing update: Faraday Cup
Designed for reliable beam current measurements in high vacuum, the assembly is pneumatically actuated via a high-vacuum feedthrough and features active water cooling for stable operation under thermal load.
A key manufacturing step is the vacuum brazing of the copper cooling section in a vacuum furnace, ensuring high-quality joints, excellent heat transfer, and long-term reliability in UHV conditions.
This project highlights our capabilities in precision fabrication, joining technologies, and build-to-spec components for accelerator and vacuum applications. We’re happy to connect with teams looking for robust UHV hardware and thermal solutions.