Waveguides are used to transmit electromagnetic waves for new acceleration concepts. Extreme precision is required here: the 29 copper discs are manufactured with a precision of less than 0.002 µm. The entire structure has a straightness of less than 0.004 µm. The soldering process takes place in a hydrogen atmosphere. All connections are UHV-tight.
The taper is a waveguide for the transmission of microwaves up to 100 KW. In order to transmit this power largely without loss, a rectangular-circular transition is implemented in the component. As enormous electric field strengths occur at the high power levels, minimal deviations from the geometry can trigger a field surge and flashover that destroys the component. The entire geometry including the free-form surface of our taper has a form accuracy of < 2 µm!
The diamond window is used in fusion research to heat or stabilise the fusion plasma. It is water-cooled and consists of diamond discs up to 100 mm in diameter, which are brazed to a copper ring using high-temperature vacuum brazing technology in a vacuum-tight and low-stress manner. We have developed special reaction solders for this purpose.
– also called pumping port. Mode converters such as the vacuum port take on the task of converting a rectangular waveguide into a round waveguide. The central component is the taper, in which the shape change takes place. On the component shown above, the taper is made of copper and consists of 2 halves. This is clearly visible in the explosion. Tapers must be precisely shaped in the nanometre range. We achieve this by means of ultra-precision milling.
The two halves of the taper are then joined using high-temperature soldering technology.