Study of primary knock-on atoms from high-energy proton bombardment

高能质子轰击初级碰撞原子的研究

• 批准号: 17K14918
• 负责人: 蔡 碧恩
• 金额: $ 2.83万
• 依托单位: Japan Atomic Energy Agency
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2017
• 资助国家: 日本
• 起止时间: 2017-04-01 至 2020-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-17K14918/
• 关键词: PKA; PHITS; Radiation Damage; gas ionization chamber; dE-E; particle identification; primary knock-on atoms; time of flight

Primary knock-on atoms (PKAs) play a fundamental role in radiation damage assessment for proton accelerators, and can also be used to validate physics models for simulating proton-induced nuclear reactions. This study was aim to develop a new measurement system, and by which to provide new experimental data of PKAs.PKAs created by high-energy proton bombardment consist of nuclides with a continuous mass range from 1 amu to the target nuclide mass, and with an energy spectrum from sub-MeV to several tens of MeV. The new measurement system we proposed in this study consists of two ultrafast timing detectors for time of flight (tof) measurement and a customized dE-E gas ionization chamber. The PKA isotopes are identified by combining the dE-E and tof-E relations, and then their energies can be determined by tof.The customized dE-E gas ionization chamber along with its gas flow system has been successfully built for this study. It was successfully tested at the Tandem Accelerator of Japan Atomic Energy Agency by using a calibration Am-241 alpha source. The detector performance was also confirmed with a 70-MeV proton beam bombarding a thin carbon target at CYRIC, Tohoku University, and the PKA elements were able to be identified for C, B, Be, and Li.The ultrafast timing detectors which include an ultrathin carbon foil, an electrostatic mirror, and a microchannel plate detector, were also built. However, the signals of the ultrafast timing detectors were noisy such that true events cannot be separated from background events, which has to be solved befor taking steps forward.

初级碰撞原子 (PKA) 在质子加速器的辐射损伤评估中发挥着重要作用，也可用于验证模拟质子诱发核反应的物理模型。本研究旨在开发一种新的测量系统，并通过该系统提供新的PKA实验数据。高能质子轰击产生的PKA由连续质量范围从1 amu到目标核素质量的核素组成，并且具有能谱从亚MeV到几十MeV。我们在本研究中提出的新测量系统由两个用于飞行时间 (tof) 测量的超快定时探测器和一个定制的 dE-E 气体电离室组成。通过结合 dE-E 和 tof-E 关系来识别 PKA 同位素，然后可以通过 tof 确定它们的能量。本研究已成功构建了定制的 dE-E 气体电离室及其气流系统。它在日本原子能机构的串联加速器上使用校准 Am-241 α 源成功进行了测试。探测器的性能也通过 70 MeV 质子束轰击东北大学 CYRIC 的薄碳靶得到证实，并且能够识别出 C、B、Be 和 Li 的 PKA 元素。超快定时探测器包括一个还建造了超薄碳箔、静电镜和微通道板探测器。然而，超快定时探测器的信号充满噪音，以至于无法将真实事件与背景事件分开，在采取措施之前必须解决这个问题。

项目成果

Establishment of a New Detection system for Measuring Primary Knock-on Atoms and Fission Fragments

建立测量初级碰撞原子和裂变碎片的新检测系统

• 发表时间: 2017
• 作者: H. NOGE;W.J. YAHYA;Y. UENO;Pi-En Tsai
• 通讯作者: Pi-En Tsai

Development of a New Measurement System for Primary Knock-on Atoms (PKA)

开发初级碰撞原子 (PKA) 的新型测量系统

• 发表时间: 2018
• 期刊: CYRIC Annual Report 2016-2017
• 作者: Tsai P.E.,;Iwamoto Y.;Hagiwara M.;Sato T.;Satoh D.;Abe S.;Itoh M.;and Watabe H
• 通讯作者: and Watabe H

Development of a gas ionization chamber for PKA charge distribution measurements

开发用于 PKA 电荷分布测量的气体电离室

• 发表时间: 2019
• 作者: Liang Yunye;Khazaei Mohammad;Ranjbar Ahmad;Arai Masao;Yunoki Seiji;Kawazoe Yoshiyuki;Weng Hongming;Fang Zhong;Mohammad Khazaei;Pi-En Tsai
• 通讯作者: Pi-En Tsai

5.Development of the Detection System for 70-MeV Proton-induced PKAs

5.70MeV质子诱导PKA检测系统的研制

• 发表时间: 2018
• 作者: 加藤岳仁;他;Pi-En Tsai
• 通讯作者: Pi-En Tsai

Establishment of a Novel Detection System for Measuring Primary Knock-on Atoms

建立测量初级碰撞原子的新型检测系统

• 发表时间: 2017
• 作者: Liang Yunye;Khazaei Mohammad;Ranjbar Ahmad;Arai Masao;Yunoki Seiji;Kawazoe Yoshiyuki;Weng Hongming;Fang Zhong;Mohammad Khazaei;Pi-En Tsai;Pi-En Tsai
• 通讯作者: Pi-En Tsai