HB2025 - the 71st ICFA Advanced Beam Dynamics workshop on High-Intensity and High-Brightness Hadron Beams

Beam Dynamics of a High-frequency RFQ with Nested Solenoid

THPT08

Oct 23, 2025, 3:30 PM

2h

third floor (conference center)

Poster Presentation WGB:Beam Dynamics in Linacs THPT poster session

Speaker

Zhongshan Li (Institute of Modern Physics)

Description

To make ion accelerators in applications more compact, the Institute of Modern Physics, Chinese Academy of Sciences is dedicated to researching the radio frequency quadrupole (RFQ) operating at a frequency as high as 1 GHz. While high frequency can effectively enhance the acceleration gradient of RFQ, it also leads to low transverse focusing force, reduced acceptance and decreased transmission efficiency. To solve these problems, this paper proposes a novel high-frequency RFQ - nesting a solenoid outside the RFQ cavity to provide additional transverse focusing force, thereby increasing acceptance and improving transmission efficiency. By optimizing the dynamic parameters of RFQ and solenoid, the beam dynamics design of a 7.0 MeV proton RFQ has been successfully completed. This RFQ achieves a beam transmission efficiency of up to 91%, with a total length of only 2.3 meters and an effective acceleration gradient of 3.0 MV/m.