Fabrication and RF test of the 500 MHz-RFQ linear accelerator for a transportable neutron source RANS-III

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2022-09-05 DOI:10.3233/jnr-220021

S. Ikeda, Tomohiro Kobayashi, Y. Otake, Ryuji Matsui, M. Okamura, N. Hayashizaki

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引用次数: 0

Abstract

At RIKEN, a transportable accelerator-driven compact neutron source (RANS-III) is under development for an on-site nondestructive inspection of the degradation of old concrete and reinforcing steel. RANS-III consists of an ion source, a low-energy beam transport, a radio frequency quadrupole linear accelerator (RFQ linac), a radio frequency (RF) system, a high-energy beam transport, a target station and a neutron measurement system. Because the inner diameter of the RFQ linac is inversely proportional to the resonance frequency, the resonance frequency of the RANS-III RFQ linac in this study was chosen to be 500 MHz, which is 2.5 times that of the RANS-II RFQ linac. Therefore, the inner diameter and weight of the RANS-III RFQ linac were reduced to approximately half and one third, respectively, of those of the RANS-II RFQ linac. The RANS-III RFQ linac was designed to accelerate a proton beam with a 10 mA peak current and 100 μA average beam current from 30 keV to 2.49 MeV (Journal of Disaster Research 12(3) (2017) 585–592). Based on the evaluations, an RFQ linac for RANS-III was fabricated, and the RF characteristics of the cavity, such as the resonant frequency and electric-field distribution, were measured using a low-power test and tuned using fixed tuners. In addition, RF couplers and RF systems were constructed to inject RF power into the RANS-III RFQ linac, and RF input tests were performed.

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可移动中子源ransi - iii 500 MHz-RFQ直线加速器的研制与射频测试

在RIKEN，一种可移动加速器驱动的紧凑中子源(ransi - iii)正在开发中，用于现场无损检测旧混凝土和钢筋的退化。RANS-III由离子源、低能束流输运、射频四极直线加速器(RFQ直线加速器)、射频(RF)系统、高能束流输运、目标站和中子测量系统组成。由于RFQ直线器的内径与谐振频率成反比，因此本研究选用的ransi型RFQ直线器的谐振频率为500 MHz，是ransi型RFQ直线器的2.5倍。因此，ransi型RFQ直线机的内径和重量分别减少到ransi型RFQ直线机的一半和三分之一左右。设计了RANS-III RFQ直线加速器，将峰值电流为10 mA、平均电流为100 μA的质子束流从30 keV加速到2.49 MeV (Journal of Disaster Research, 12(3)， 2017) 585-592)。在此基础上，制作了一个用于ransi - iii的RFQ线性放大器，并利用低功率测试测量了谐振腔的谐振频率和电场分布等射频特性，并用固定调谐器对其进行了调谐。此外，构建射频耦合器和射频系统，为ransi - iii RFQ线性器注入射频功率，并进行射频输入测试。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.