Abstract
The coupled ladder RFQ-IH DTL structure is designed for transportable accelerator-based neutron source to accelerate the proton beam to 2.5 MeV with a peak current of 15 mA. The Kombinierte Null Grad Struktur (KONUS) dynamics scheme is chosen in the IH-DTL section to obtain compact structure, high transmission efficiency and small emittance growth. Three KONUS periods, including two quadrupole doublets are housed in the IH-DTL section. The field distribution of coupled structure is studied and the evaluation of the coupled field is quantified. The optimization voltage ratio and electric flatness are carried out based on three-dimension full model. In addition, the structure error analysis is performed to evaluate the acceptance of different errors. The tuning system is designed to compensate the machining and alignment errors and the field tuning strategy is proposed for the coupled cavity. The RF electromagnetic design and optimization, structure error analysis and field tuning will be comprehensively presented in this paper.
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