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.

一级敲入原子（PKA）在质子加速器的辐射损伤评估中起着基本作用，也可以用于验证物理模型，以模拟质子诱导的核反应。这项研究的目的是开发一个新的测量系统，并提供由高能量质子轰击而产生的PKA的新实验数据。由核素组成，由核素组成，其连续质量范围从1 AMU到目标核素质量，并且具有从Sub-MEV到MEV的能量谱。我们在这项研究中提出的新测量系统包括两个超快速正时探测器，用于飞行时间（TOF）测量和一个定制的DE-E气离子电离室。通过组合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。定制的DE-E气体电离室及其气流系统已成功为这项研究构建。它通过使用校准AM-241α源在日本原子能局的串联加速器上成功进行了测试。还通过70 mev质子梁轰击了Cyric，Tohoku University的稀薄碳靶标，并且可以在C，B，BE和LI。超快的时机探测器，包括超纤维纤维箔，静电镜和微型板架检测器，还可以确定探测器的性能。但是，超快正时探测器的信号嘈杂，因此不能将真实事件与背景事件分开，而后者必须解决这一目标。

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

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

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