首页|基于全永磁微波离子源钛自成靶的D-D中子源设计研究

基于全永磁微波离子源钛自成靶的D-D中子源设计研究

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介绍了一种基于全永磁微波离子源钛自成靶技术的紧凑型氘氘(D-D)中子源,其设计中子产额为 1×109 s-1.该D-D中子源已经进行了800 h以上的测试,系统可重复稳定运行.早期测试结果显示,系统打火频率高、中子产额低,长时间放电后反向电子会烧蚀Al2O3 陶瓷窗,导致微波耦合困难,氘等离子体无法点亮.通过在等离子体腔室中添加氮化硼(BN)保护片以及在钛靶与高压电极之间增加电子抑制电阻,有效抑制了Al2O3 陶瓷窗的损伤.通过对等离子体电极孔径的优化和降低腔室压力,降低了打火频率,提高了中子的产额.系统优化后,氘离子能量为 70 keV、束流强度为 5 mA时,中子产额达到了 2.0×108 s-1.在氘离子能量为 97 keV、束流强度为6.6 mA时,系统中子产额达到5.2×108 s-1.
Design of a D-D Neutron Source Based on Permanent Magnet Microwave Ion Source and Titanium Drive-in Target
A compact deuterium-deuterium(D-D)neutron source system with a designed neutron yield of 1×109 s-1 based on permanent magnet microwave ion source and titanium(Ti)drive-in target technique is described.This neutron source system has been tested for more than 800 hours,and it can operate repeatedly and stably at present.The early test re-sults show that the system has high ignition frequency and low neutron yield.And the D plasma cannot discharge after long time operation due to the Al2O3 ceramic window which used for the microwave feed being ablated by the emitted secondary electrons.The damage of Al2O3 ceramic window was effectively inhibited by adding a BN protection plate in the plasma chamber and an electron suppression resistance between the Ti target and the high voltage electrode in the vacuum chamber of the neutron source system.By optimizing the structure of the plasma electrode and increasing the vacuum degree,the igni-tion frequency of the system is reduced,and the neutron yield is increased.The neutron yield is up to 2.0×108 s-1 during the 5 mA and 70 keV D ions bombarding the Ti target.When the deuterium ion energy is 97 keV and the D beam intensity is 6.6 mA,the neutron yield of the system reaches 5.2×108 s-1.

microwave ion sourcedeuteron deuteron reactiontitanium driven-in targetneutron source

李旭、廖晨伦、谢亚红、曹小岗、洪兵、梁立振、顾玉明、胡纯栋、孟献才

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合肥综合性国家科学中心能源研究院 安徽省能源实验室,合肥 230031

东华理工大学 核科学与工程学院,南昌 330032

中国科学院合肥物质科学研究院 等离子体物理研究所,合肥 230031

微波离子源 氘氘核反应 钛自成靶 中子源

国家自然科学基金国家自然科学基金国家自然科学基金安徽省自然科学基金合肥综合性国家科学中心能源研究院(安徽省能源实验室)项目合肥综合性国家科学中心能源研究院(安徽省能源实验室)项目中央高校基本科研业务费专项

1210513512005145123052002308085MA2221KZS20221KZS208NJ2022019-3

2024

10.12446/j.issn.1006-7086.2024.03.017

真空与低温
中国航天科技集团公司第五研究院510研究所

真空与低温

CSTPCD
影响因子：0.567
ISSN：1006-7086
年,卷(期)：2024.30(3)
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