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

Shota Ikeda, Tomohiro Kobayashi, Yoshie Otake, Ryuji Matsui, Masahiro Okamura and Noriyosu Hayashizaki

Jadavpur Journal of International Relations, 2022, vol. 24, issue 3-4, 249-259

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 μ A 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.

Keywords: Transportable compact neutron source; RFQ linac; proton accelerator (search for similar items in EconPapers)
Date: 2022
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Persistent link: https://EconPapers.repec.org/RePEc:sae:jadint:v:24:y:2022:i:3-4:p:249-259

DOI: 10.3233/JNR-220021

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