Abstract
The High Charge State Injector (HLI) at the GSI Helmholtz Centre for Heavy Ion Research in Darmstadt, Germany, is one of the two injector linacs for the Universal Linear Accelerator (UNILAC) and might also serve as injector for a proposed superconducting CW linac for heavy element research. Within the scope of an intended CW upgrade of the HLI front end, a CW capable Radio Frequency Quadrupole (RFQ) with an operating frequency of 108MHz is required. The existent 4-rod RFQ, which was commissioned at the HLI in 2010, suffers from severe modulated RF power reflections that limit the achievable performance and impede stable operation. Using a laser vibrometer, measurements of the velocity profile of the electrodes allowed to identify mechanical vibrations as source of the RF reflections as well as the edges of the RF pulse as their excitation. The structural mechanical characteristics of the 4-rod geometry were further investigated by simulations. This allowed to reproduce the preceding measurement results and identify the RF affecting mechanical eigenmodes of the electrodes. In order to fulfill the upcoming operational requirements, a completely newly revised 4-rod RFQ design with optimized structural rigidity is proposed.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
