---
title: Listemann delivers vacuum brazed assemblies for nuclear fusion reactor ITER
description: Listemann delivers vacuum brazed assemblies for nuclear fusion reactor ITER
---

<https://info.listemann.com/en/blog>

# [Listemann delivers vacuum brazed assemblies for nuclear fusion reactor ITER](https://info.listemann.com/en/blog/vacuum-brazed-assemblies-for-nuclear-fusion-reactor)

 Written by [Manfred Boretius](https://info.listemann.com/en/blog/author/manfred-boretius) | Oct 14, 2020 8:41:43 AM

Recently we had the opportunity to support the [**ITER**](https://www.iter.org/) project in France. The ITER Tokamak is a machine meant to produce energy from the nuclear fusion, same nuclear reaction, which powers the sun and the stars.

## The sun as a blueprint - nuclear fusion as the energy source of the future

It will rely on three sources of external heating to bring the plasma to the temperature necessary for fusion: neutral beam injection and two sources of high-frequency electromagnetic waves, ion and electron cyclotron heating. By generating waves at a frequency that matches the oscillation of specific ion species in the plasma, the ion cyclotron resonance heating (ICRH) system transfers energy to the plasma (see Figure 1).

Figure 1: Ion cyclotron resonance heating (ICRH) system transfers energy to the plasma \[source: https://www.iter.org/ \]

 

A generator, transmission lines and an antenna are necessary for ion cyclotron heating. A generator produces high-power radio frequency waves that are carried along a transmission line to an antenna located in the vacuum vessel, sending the waves into the plasma.

 

## Vacuum brazed steel / copper assemblies for a tight connection

The company [Mairold-Mechanik AG](https://www.mairold.ch/),, cooperating with [Stäubli Electrical Connectors AG](https://ec.staubli.com/), asked Listemann AG to supply vacuum brazed steel / copper assemblies to be integrated in a RF Antenna of the ICRH (see Figure 2). The main requirement for the joint was tightness since the parts are predestined for vacuum. A silver based brazing alloy, suitable for vacuum applications, was selected and successfully implemented.

 

Figure 2: The vacuum brazed components to be integrated in the antenna   
\[source: Company Stäubli\]

 

 

<https://info.listemann.com/en/vacuum-brazing-guide?hsLang=en>

 

[View full post](https://info.listemann.com/en/blog/vacuum-brazed-assemblies-for-nuclear-fusion-reactor)

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