Institute Science and Technology of Accelerating Systems
VSR Demo at HZB - Advancing Superconducting RF Technology
Overview
The Variable Pulse Length (VSR) Demo at Helmholtz-Zentrum Berlin (HZB) is a pioneering project aimed at advancing superconducting RF technology for next-generation accelerators. This initiative focuses on implementing higher-order harmonic cavities to senable CW operation in synchrotron or high current accelerator systems.
Project Goals
✔ Enhanced Beam Performance – Achieving ultra-short electron bunches for improved precision in free-electron lasers and light sources.
✔ Cutting-Edge SRF Technology – Utilizing new superconducting 1.5 GHz harmonic cavities for higher acceleration efficiency.
✔ Optimized Cryomodule Design – Developing a novel cryogenic system to support VSR integration.
✔ Collaboration & Innovation – A joint effort involving HZB and global research partners to push the boundaries of accelerator physics.
Publications
* A.Tsakanian, A. Velez et al (2025). Design of HOM Damped Multi-Cell SRF Cavities for CW Operation in High Current Storage Rings. IEEE Transactions on Applied Superconductivity, (Accepted for publication)
* N. Wunderer, et al (2025). Mechanical Design of the VSR Cavity: An elliptical 4-cell 1.5 GHz SRF cavity with strong waveguide HOM damping for high-current accelerators. IEEE Transactions on Applied Superconductivity, (Accepted for publication)
* Glock, H.-W.; Dürr, V.; Glöckner, F.; Ries, M.; Sharples-Milne, E.; Tannert, M.; Wolk, D.; Vélez, A.; Knobloch, J.: New collimating shielded bellow for the connection of superconducting rf cavities in a high current storage ring. Physical Review Accelerators and Beams 26 (2023), p. 04320/1-15
doi: 10.1103/PhysRevAccelBeams.26.043201
Open Access 
* Glöckner, F.; Pflocksch, F.; Wolk, D.; Böhlick, D.; Dürr, V.; Frahm, A.; Bürger, M.; Wunderer, N.; Knobloch, J.; Vélez, A. (2021): The VSR Demo Module Design – A Spaceframe-Based Module for Cavities with Warm Waveguide HOM Absorbers. In: Kenji Saito ... [Ed.] : SRF2021 - Proceedings of the 20th International Conference on RF SuperconductivityGeneva: JACoW, 2022. - ISBN 978-3-95450-233-2, p. MOPTEV013/1-4
https://srf2021.vrws.de/papers/moptev013.pdf
Open Access
* Wunderer, N.; Dürr, V.; Frahm, A.; Glock, H.-W.; Glöckner, F.; Knobloch, J.; Sharples-Milne, E.; Tsakanian, A.; Vélez, A.; Bonezzi, M.; D'Ambros, A.; Paparella, R.; Guo, J.; Henry, J.; Rimmer, R.: VSR Demo Cold String: Recent Developments and Manufacturing Status. In: Kenji Saito ... [Ed.] : SRF2021 - Proceedings of the 20th International Conference on RF SuperconductivityGeneva: JACoW, 2022. - ISBN 978-3-95450-233-2, p. WEPTEV008/1-5
https://srf2021.vrws.de/papers/weptev008.pdf
Open Access
Learn More
For detailed insights into the VSR Demo at HZB, explore our research publications and latest developments.