IH-DTL design with modified KONUS beam dynamics for a synchrotron-based proton therapy system

Tang, Ruo; Xing, Qingzi; Zheng, Shuxin; Guan, Xialing; Tang, Chuanxiang; Wang, Xuewu; Shi, Jinshui

doi:10.1016/j.nima.2018.10.125

Cited by 9 publications

(2 citation statements)

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“…For instance, in the Alvarez type DTL, magnets are installed in DTs [9,10], which greatly increases the size and weight of the DTs and stems. As for the KONUS type DTL [11][12][13], quadrupoles are periodically arranged inside the tank, which increases the complexity of the DTL cavity. In addition, the maintenance of the magnets is difficult and time-consuming.…”

Section: Alternating Phase Focusingmentioning

confidence: 99%

Beam dynamics and cavity design of an 8 MeV CW IH-DTL for SYSU-PAFA

Wang

et al. 2023

J. Inst.

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As a part of the Particle Accelerator Facility at Sun Yat-sen University (SYSU-PAFA), a 200 MHz drift tube linac (DTL), operating under continuous wave (CW) mode, has been designed. PAFA-DTL is expected to accelerate a 10 mA proton beam from 2.5 MeV to 8 MeV. Using the alternative phase focusing (APF) beam dynamics scheme, a compact cell array has been designed and optimized in order to limit the cavity length to 2.4 m with high acceleration efficiency. As a result, PAFA-DTL contains 31 acceleration cells with beam transmission efficiency reaches 100%, and better output beam quality is obtained by optimizing the input beam parameters. Interdigital H-mode (IH) structure is utilized in the PAFA-DTL cavity, which has achieved a high unloaded quality factor of 13987. Additionally, to ensure the stability of PAFA-DTL under CW operation, a low Kilpatrick factor (Kp) of 1.42 is obtained by adjusting the blending radius of the drift tubes (DTs) to reduce the risk of RF breakdown. The gap voltage distribution through RF design is compared with that from the beam dynamics, and the maximum absolute value of deviation is only 0.73%. In this paper, the detailed design and results of PAFA-DTL, including beam dynamics and RF design, are presented.

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Section: Alternating Phase Focusingmentioning

confidence: 99%

Beam dynamics and cavity design of an 8 MeV CW IH-DTL for SYSU-PAFA

Wang

et al. 2023

J. Inst.

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“…Low energy proton and heavy ion accelerators have a wide range of applications in scientific research and industries, such as compact accelerator-driven neutron sources (CANS) [1,2], accelerator-based boron neutron capture therapy (AB-BNCT) [3,4], and linear accelerator injectors for proton and heavy ion medical accelerators [5][6][7]. Radio frequency quadrupole (RFQ) linac is a widely used structure that can simultaneously achieve beam acceleration, transverse focusing, and longitudinal bunching.…”

Section: Introductionmentioning

confidence: 99%

Beam dynamics design and error study of the coupled structure with ladder RFQ and IH-DTL

Li,

Su,

Kong

et al. 2024

J. Inst.

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The coupled structure with ladder radio-frequency quadrupole (RFQ) and interdigital H-type drift tube linac (IH DTL) has been proposed to accelerate the proton beam to several MeV with high acceleration gradient and one RF feed-in system. A ladder RFQ-IH DTL coupled structure was designed to accelerate a proton beam 2.5 MeV with a peak current of 15 mA. Detailed dynamics optimization and error study were performed to achieve high transmission efficiency and small emittance growth, including ladder RFQ, coupling section and IH DTL section. The Kombinierte Null Grad Struktur (KONUS) dynamics scheme with two quadrupole doublets (QDs) was adopted in the IH-DTL section. Start-to-end beam tracking results showed that the proton beam can be accelerated to the final energy with a length of 2.11 m and a transmission efficiency above 98.5%. In addition, we performed error sensitivity analysis and the combined error study to evaluate the error tolerance limits of the ladder RFQ-IH DTL coupled structure.

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