Abstract
Radio frequency quadrupole linac (RFQ) is the key component which realized modern high-current proton linacs, however, many RFQs are designed based on very conventional design schemes. We developed 3-MeV 50-mA ${\mathrm{H}}^{\ensuremath{-}}$ (negative hydrogen) RFQ based on a beam space-charge physics concept. The equipartitioning scheme, which is widely used in the high intensity linac design, is implemented into the RFQ design. Design performances of 99.1% transmission, $0.24\ensuremath{\pi}\text{ }\text{ }\mathrm{mm}\text{ }\mathrm{mrad}$ transverse normalized rms emittance, and $0.11\ensuremath{\pi}\text{ }\text{ }\mathrm{MeV}\text{ }\mathrm{deg}$ for longitudinal direction are achieved with a vane length of 3 m and the final energy of 3 MeV. An RFQ employing this design concept was fabricated, and the design performance was confirmed by beam commissioning. In this paper, the design and result of the beam commissioning of this fully equipartitioned RFQ are described.
Highlights
The radio frequency quadrupole (RFQ) is the key component which realized modern high-current proton linacs
We have developed a fully equipartitioned RFQ, which accelerates a negative hydrogen beam from 50 keV to 3 MeV
For the beam-dynamics design, LINACSrfqDES was used and LINACSrfqSIM was employed for the particle simulation
Summary
The radio frequency quadrupole (RFQ) is the key component which realized modern high-current proton linacs. B remains strong even in the ACC, where the space-charge force is relatively weak and the transverse focusing force needs not to be strong This causes insufficient longitudinal force and ineffective acceleration efficiency. Jameson) proposed to use the equipartitioning beamdynamics scheme in the RFQ design [4] With this method, the beam dynamics is purely based on the correct beam physics with space charge, achieved with flexible choices of the main parameters. The transverse and longitudinal forces are naturally balanced by the equipartitioning scheme and the efficient acceleration can be achieved. We call this RFQ design method as “beam oriented RFQ design.”.
Sign-in/Register to view highlights & summary 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.
