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TRUMPF shows off completed copper RFQ for CERN I.FAST project

The complex radio frequency quadrupole (RFQ) was 3D printed in one piece and will be on display at Formnext

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At the upcoming Formnext, metal 3D printer manufacturer TRUMPF will be showing the completed version of an additively manufactured core copper component of future particle accelerators, as part of the EU-funded I.FAST project coordinated by CERN. For the first time, it has been possible to print this critical copper component in one piece. “This is proof that large copper components with a component height of nearly 400 millimeters can be manufactured additively with sufficient precision using our machines – or in other words: with 3D printing, we can manufacture even high-precision parts like this faster, cheaper and more energy-efficiently,” said Michael Thielmann, additive manufacturing expert at TRUMPF. The high-tech company will show the particle accelerator component at the leading 3D printing trade show Formnext in Frankfurt in November.

The component is a radio frequency quadrupole (RFQ), one of the most complex parts of any accelerator complex. The RFQ provides energy to the beam of particles bringing them ever close to the speed of light. “Over 30 000 accelerators are currently in use worldwide, the large majority of which is used for healthcare, and industry. Additive manufacturing can help reduce the size and cost of all accelerator types, by improving and shortening their fabrication and enhancing their performance,” explained CERN’s Maurizio Vretenar, project coordinator of I.FAST.

TRUMPF shows off completed copper RFQ for CERN: 3D printed in one piece, it will be on display at Formnext to show benefits of green laserLooking into AM

This is not the first time that CERN engineers turn to AM. In the past, AM was used for manufacturing thin wall arrays with metal AM from 3D Systems. The RFQ was developed as part of the EU-funded and CERN-coordinated I.FAST (Innovation Fostering in Accelerator Science and Technology) project. The aim of the strategic project is to allow Europe to develop and enhance leadership in particle accelerators for science and society. Among other things, the focus is on 3D metal printing. “It is evident that in the future, we will be increasingly using additively manufactured components within the accelerator community and our facilities” says Toms Torims from RTU, who is I.FAST Work Package coordinator for advanced accelerator technologies.

I.FAST team of experts from CERN, Politecnico de Milano, CNRS-IN2P3, Fraunhofer IWS and Riga Technical University designed the complex component specifically for TRUMPF’s TruPrint 5000 green edition. RFQ has very high demands on the manufacturing process. “This is where our TruPrint 5000 green edition comes into its own. Thanks to the green laser, we can print even the finest copper structures at a high and consistent quality, with increased productivity,” says Thielmann.

Accelerating cost reduction

Until now, suppliers manufactured the RFQs for scientific laboratories like CERN and for the industry at large using conventional methods. Many individual production steps such as milling and brazing were necessary. This costs time and money. Additive manufacturing eliminates many intermediate steps. For example, the TRUMPF system can build around empty spaces such as cooling channels when printing the RFQ.

“With our green laser, we are also faster in the additive manufacturing of copper components than comparable systems with infrared technology,” said Thielmann. The copper absorbs the green laser beam better than that of an infrared laser, making it easier to process. “We need less energy to be as fast as an infrared laser, or we can work faster with the same energy,” Thielmann says. As a result, users can additively manufacture copper components more cheaply with the green laser.

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