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Physics design of a coupled RFQ-DTL cavity for a compact neutron source
Journal of Instrumentation ( IF 1.3 ) Pub Date : 2021-08-25 , DOI: 10.1088/1748-0221/16/08/p08058
Q.Y. Tan 1 , Y.R. Lu 1 , Z. Wang 1 , K. Zhu 1 , S. Liu 1 , M.Y. Han 1
Affiliation  

Neutrons have been widely used, such as neutron imaging, transmutation of nuclear waste, Neutron Capture Therapy (NCT), et al. Neutrons are generally produced by nuclear reactors or accelerator-driven neutron sources. Comparing with nuclear reactors, accelerator-driven neutron sources have many advantages, such as compact and cheap. We proposed a coupled RFQ-DTL cavity as the main component of a miniaturized neutron source. A high accelerating efficiency was achieved by placing Radio Frequency Quadrupole (RFQ) and Drift Tube Linac (DTL) in one cavity. Since the fringe field will increase the energy spread, we propose a method using the fringe field as a buncher to reduce the negative effect, and it will eliminate the use of external bunchers. The coupled RFQ-DTL cavity will accelerator a 25 mA proton beam from 35 keV to 2.5 MeV within 2.23 m. RFQ section and DTL section are 1.55 m and 0.68 m, respectively. Compared with a conventional RFQ, the length of coupled RFQ-DTL is shorten by 53%. The total transmission efficiency is 98.55%. A variable energy design for the beam output energy can be achieved by changing the insertion depth of the DTL tuner and controlling the feeding power of the cavity.



中文翻译:

用于紧凑型中子源的耦合 RFQ-DTL 腔的物理设计

中子已被广泛应用,如中子成像、核废料嬗变、中子俘获疗法(NCT)等。中子通常由核反应堆或加速器驱动的中子源产生。与核反应堆相比,加速器驱动的中子源具有体积小、价格便宜等诸多优点。我们提出了一个耦合 RFQ-DTL 腔作为小型化中子源的主要组成部分。通过在一个腔体中放置射频四极杆 (RFQ) 和漂移管直线加速器 (DTL) 实现了高加速效率。由于边缘场会增加能量传播,我们提出了一种使用边缘场作为聚束器来减少负面影响的方法,它将消除使用外部聚束器。耦合的 RFQ-DTL 腔将在 2.23 m 内将 25 mA 质子束从 35 keV 加速到 2.5 MeV。RFQ 段和 DTL 段分别为 1.55 m 和 0.68 m。与传统的RFQ相比,耦合RFQ-DTL的长度缩短了53%。总传输效率为98.55%。通过改变DTL调谐器的插入深度和控制腔体的馈电功率,可以实现光束输出能量的可变能量设计。

更新日期:2021-08-25
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