Study and design of the coupled cavity with ladder RFQ and IH DTL structure for transportable neutron source

H. P. Li, X. J. Hui, H. Q. Su, G. Q. Kong, C. Liu, F. Y. Wang, J. Wang, B. L. Ma, S. Wang, Y. R. Lu, Z. Wang

Research output: Contribution to journalArticlepeer-review


A transportable accelerator-driven neutron source is under development in Xi'an Jiaotong University (X-TANS), aiming at realizing various outdoor applications, such as on-site degradation diagnosis of concrete infrastructures and analysis of raw materials. To downsize the accelerator cavity for X-TANS, we coupled the Ladder RFQ and an Interdigital H-type Drift tube linac (IH-DTL) into a single cavity to combine the strength of the RFQ's efficient bunching efficiency and DTL's high accelerating gradient and to distantly reduce the weight and size of the linac. To achieve electromagnetic resonance between two structures and a high coupling factor, a novel coupled structure was adopted by adjusting the last supporting plate at the exit of RFQ. The mode separation between 0-mode and π-mode was expanded to 7.96 MHz. Consequently, the 15 mA proton beam can be accelerated to 2.5 MeV with a length of 1.73 m and the effective transmission of above 90%. The dissipated cavity power was 96.87 kW with an operation frequency of 200 MHz and a duty factor of 3%. The design concept of the coupled structure and the results of the beam dynamics design, electromagnetic simulation and multi-physics will be comprehensively presented in this paper.

Original languageEnglish (US)
Article number168645
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
StatePublished - Nov 2023
Externally publishedYes


  • Beam dynamics
  • Coupled cavity
  • IH DTL
  • Ladder RFQ

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation


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