Additive Manufacturing of Side-Coupled Cavity Linac Structures from Pure Copper: A First Concept

Mayerhofer M, Brenner S, Helm R, Gruber S, Lopez E, Stepien L, Gold G, Dollinger G (2023)

Publication Type: Journal article

Publication year: 2023

Journal

Instruments MDPI

Book Volume: 7

Article Number: 56

Journal Issue: 4

DOI: 10.3390/instruments7040056

Abstract

Compared to conventional manufacturing, additive manufacturing (AM) of radio frequency (RF) cavities has the potential to reduce manufacturing costs and complexity and to enable higher performance. This work evaluates whether normal conducting side-coupled linac structures (SCCL), used worldwide for a wide range of applications, can benefit from AM. A unit cell geometry (SC) optimized for 75 MeV protons was developed. Downskins with small downskin angles (Formula presented.) were avoided to enable manufacturing by laser powder bed fusion without support structures. SCs with different (Formula presented.) were printed and post-processed by Hirtisation (R) (an electrochemical process) to minimize surface roughness. The required accuracy for 3 GHz SCCL (medical linacs) is achieved only for (Formula presented.). After a material removal of 140 µm due to Hirtisation (R), a quality factor (Formula presented.) of 6650 was achieved. This corresponds to 75% of the (Formula presented.) simulated by CST^®. A 3 GHz SCCL concept consisting of 31 SCs was designed. The effective shunt impedance (Formula presented.) simulated by CST corresponds to (Formula presented.) and is comparable to the (Formula presented.) of SCCL in use. The reduction in (Formula presented.) expected after Hirtisation (R) can be justified in practice by up to 70% lower manufacturing costs. However, future studies will be conducted to further increase (Formula presented.).

Authors with CRIS profile

Gerald Gold Professur für Rechnergestützten Schaltungsentwurf

Involved external institutions

Universität der Bundeswehr München

Germany (DE) Fraunhofer-Institut für Werkstoff- und Strahltechnik (IWS) / Fraunhofer Institute for Material and Beam Technology

Germany (DE)

How to cite

APA:

Mayerhofer, M., Brenner, S., Helm, R., Gruber, S., Lopez, E., Stepien, L.,... Dollinger, G. (2023). Additive Manufacturing of Side-Coupled Cavity Linac Structures from Pure Copper: A First Concept. Instruments, 7(4). https://doi.org/10.3390/instruments7040056

MLA:

Mayerhofer, Michael, et al. "Additive Manufacturing of Side-Coupled Cavity Linac Structures from Pure Copper: A First Concept." Instruments 7.4 (2023).

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