著者

久保 毅幸

出版者

日本加速器学会

雑誌

加速器 (ISSN:13493833)

巻号頁・発行日

vol.20, no.1, pp.50-56, 2023-04-30 (Released:2023-05-16)

参考文献数

6

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The author, a physicist who takes long-term paternity leave of more than two years, tells a life of a stay-at-home dad in New York. The story includes how he has become a stay-at-home dad, his daily routine, and the calamities he encounters daily.

著者

久保 毅幸

出版者

日本加速器学会

雑誌

加速器 (ISSN:13493833)

巻号頁・発行日

vol.15, no.2, pp.40-51, 2018-07-31 (Released:2021-10-05)

参考文献数

36

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The nitrogen infusion, the recently discovered surface processing method for high-gradient and high-quality factor superconducting cavities, attracts much attention in the particle accelerator community in particular in the context of the International Linear Collider project. In this paper, we briefly review the basics of superconducting cavity, the causes of performance limitation, and the three modern surface processing methods including the nitrogen infusion and resultant cavity performances. The present understanding on physics behind these surface treatments are also discussed.

著者

想田 光 岩井 岳夫 金井 貴幸 宮坂 友侑也 佐藤 啓 根本 建二 上野 義之 嘉山 孝正

出版者

日本加速器学会

雑誌

加速器 (ISSN:13493833)

巻号頁・発行日

vol.17, no.3, pp.144-150, 2020-10-31 (Released:2021-10-05)

参考文献数

12

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Yamagata University has carried out a heavy ion treatment facility project since 2004. Building and treatment machine has been constructed since 2017. The carbon ion medical accelerator consists of a permanent-magnet type electron cyclotron resonance (ECR) ion source, a series of linear accelerator of radiofrequency quadrupole (RFQ) and interdigital H-mode drift tube linac (IH-DTL) with an energy of 4 MeV/u, and an alternative gradient synchrotron of 430 MeV/u. There are two irradiation rooms, one has a fixed horizontal port and the other has a rotating gantry port with superconducting magnets. Since the irradiation rooms are placed above the accelerator room, the footprint of the building is only 45×45 m, which is significantly smaller than preceding facilities. The synchrotron has a variable-energy flattop operation pattern with 600 energies. This operation enables a three-dimensional spot scanning irradiation without range shifters. A superconducting rotating gantry is equipped with a pair of improved scanning magnets in the downstream of the final bending magnets and is downsized to 2/3 of the first model built in NIRS. The construction of the building was completed in May 2019. The treatment irradiation will start in February 2021 after machine optimization and clinical beam data measurement.

著者

河田 洋

出版者

日本加速器学会

雑誌

加速器 (ISSN:13493833)

巻号頁・発行日

vol.15, no.3, pp.126-131, 2018-10-31 (Released:2021-10-05)

参考文献数

17

被引用文献数

2

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It is essential to develop the high power EUV light source up to 1 kW to realize the 3 nm node to reduce stochastic variation and achieve higher throughput. To this end, our group has proposed an energy recovery linac (ERL)-based free electron laser (FEL) which will produce more than 10 kW EUV light to provide the light into several scanners. This article describes the present status of the EUV Lithography which is a starting point of HVM, and the future prospect of a high power EUV-FEL light source based on ERL accelerator technologies.

著者

松村 宏 桝本 和義 吉田 剛 豊田 晃弘 中村 一 三浦 太一

出版者

日本加速器学会

雑誌

加速器 (ISSN:13493833)

巻号頁・発行日

vol.18, no.2, pp.63-71, 2021-07-31 (Released:2021-08-04)

参考文献数

16

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Measurement of activated materials and evaluation of activated areas of several types of accelerator facilities were studied for decommissioning planning from FY2017 to FY2020 under the contract of the Nuclear Regulation Authority. The research results were summarized in “Manual of Measurement and Evaluation of Activation for Decommissioning of Accelerator Facilities.” This manual consists of the classification of the activation area of accelerator facilities and the measurement and evaluation of the activation of concrete structures and metallic accelerator components in the decommissioning of accelerator facilities. This manual will be used for the decommissioning of accelerator facilities in Japan.

著者

伊藤 拓

出版者

日本加速器学会

雑誌

加速器 (ISSN:13493833)

巻号頁・発行日

vol.17, no.3, pp.181-186, 2020-10-31 (Released:2021-10-05)

参考文献数

16

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Medical radio-isotopes (RI) are commercially produced by accelerators or nuclear reactors. For more than a half century accelerators have routinely produced medical RI used for radiopharmaceuticals in nuclear medicine. Described here is a general introduction of commercial production of medical RI with an accelerator, and recent topics about technical development of use of an accelerator for production of 99Mo and 225Ac. Nihon Medi-Physics has started a project of 99Mo in-house production with an electron linear accelerator since 2019. Alpha emitting nuclide, 225Ac has attracted much attention recently for therapeutic applications based on the concept of Theranostics. 225Ac supply currently relies solely on 229Th generator but alternative production method with an accelerator has been being developed.

著者

山根 功

出版者

日本加速器学会

雑誌

加速器 (ISSN:13493833)

巻号頁・発行日

vol.18, no.2, pp.111, 2021

著者

益川 敏英 川合 光

出版者

日本加速器学会

雑誌

加速器 (ISSN:13493833)

巻号頁・発行日

vol.6, no.1, pp.18-27, 2009