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It is well known that the tuning of a long radio-frequency quadrupoleaccelerator is demanding. This study investigated how to realize efficient longRFQ accelerators with multiple shorter and independent cavities. From the RFpoint of view, the use of shorter cavities has many advantages e.g. enlargedmode separation and simplified RF tuning, but the beam matching betweencavities will become an issue, especially at high current and low energy.Taking a more than 9 m long, high current machine as an example, this paperpresents the design concepts and methods leading to good beam quality and highbeam transmission throughout a multi-stage RFQ accelerator.

Realizing long radio-frequency quadrupole accelerators with multiple shorter and independent cavities