Conventional SRF cavities are used in standing wave regime and are limited by surface fields to ~50 MV/m. In order to overcome this limit, Superconducting Traveling Wave (SCTW) cavity was proposed as it allows to achieve ~1.5 times higher accelerating gradient operating at lower phase advance per cell, thus improving transit time factor. However, power recirculation through a feedback...
At the Paul Scherrer Institute (PSI), a novel, industrially scalable, and tuning-free manufacturing process for normal-conducting high-gradient C-band accelerating structures has been developed and successfully implemented for the Swiss Free-Electron Laser (SwissFEL). This approach, which eliminates RF post-production tuning, achieves excellent field flatness and phase accuracy through...
Charge stripping is an essential technique for the efficient acceleration of heavy ions. The Facility for Rare Isotope Beams (FRIB) utilizes the Liquid Lithium Charge Stripper (LLCS) to produce the world’s most powerful heavy ion beams, so far demonstrated up to 20 kW with 200 MeV/u energy. In the FRIB driver linac, electrons are stripped by a thin film jet of liquid lithium flowing at 50 m/s....
