ST1 - Advanced CW SRF Systems

       The MT-ARD ST1 goal is to develop superconducting radio-frequency (SRF) science and technology in order to significantly improve the performance of accelerator-based facilities. Continuous wave (CW) SRF offers multifaceted advantages: from increased brilliance through greater stability to greater flexibility in pulse patterns and bunch properties, which can thus be tailored to more effectively meet user requirements.
       ST1 comprises three key research foci for maximum impact on future SRF infrastructures: CW SRF injectors for high-brightness electron beam generation, CW SRF technologies of electrons and hadrons, and development of new CW SRF materials to outperform state-of-the-art niobium.
       Building on the Helmholtz Gun Cluster collaboration, CW SRF injectors target high-brilliance CW electron sources for various applications. While HZDR is developing injectors for high-field THz generation, HZB is studying high-current sources for facilities such as ERLs. DESY’s focus is on an all-superconducting source matched to the needs of CW free-electron lasers (FELs). CW SRF technologies target generic systems that address CW operation of future facilities: CW FELs (FLASH/European XFEL), high-current storage rings (BESSY VSR), coherent THz sources (DALI), and high-current heavy-ion beam sources (SHE production). CW SRF materials address the issue of the cryoplant technical and financial limit in CW operating conditions. We are now investigating improved nitrogen infusion and developing novel diagnostics and sample testing based on quadrupole resonators. Ultimately, we will investigate materials such as Nb3Sn and multilayer superconductor-insulator-superconductor (SCISC) systems to evaluate their potential for ≥ 4 K operation. Potentially, these activities will pave the way for cryo-cooler-based cryogenics for compact industry and university accelerators.

New 3D magnetic-flux mapping enables the study of RF power dissipation due to trapped magnetic flux in superconducting cavities

Point of contact

                   Jens Knobloch (HZB) und Peter Michel (HZDR)