Design Study of Laser Fusion Rocket

激光聚变火箭的设计研究

• 批准号: 05808046
• 负责人: NAKAO Yasuyuki
• 金额: $ 1.15万
• 依托单位: Kyushu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05808046/
• 关键词: Laser fusion rocket; D-T Target; Implosion simulation; Burning chamber; Thrust efficiency; Particle-in-cell code; Spin-polarized fuels; Tritium handling technology; DTターゲット; 燃焼室; 核スピン偏極; D-Tペレット; システム設計

The main purpose of the present study is to design a laser fusion rocket that is capable of manned Mars missions with a payload of 100 tons. The results are summarized as follows.(1)First, implosion/burn simulations were made for DT targets to evaluate the target gain and required laser driver energy. The roles of fusion-produced neutrons and alpha-particles in the ignition and burn phases were clarified. It was found that with the laser driver energy of <greater than or equal>3MJ,we can achieve the target gain as hig(2)A two-dimensional collisionless particle-in-cell (PC) code was developed to analyze the interaction between plasma debris derived from the DT pellet microexplosion and magnetic field applied in the thrust chamber. The thrust conversion efficiency (in terms of momentum) is given as a function of rheta, the angle subtended from the central axis to the magnetic coil. It was shown that the efficiency has a broad maximum at rheta<square root>0ﾟ and reaches -60%.(3)There is a possibility that plasma instabilities such as Rayleigh-Taylor one occur in the magnetic nozzleadopted here in the thrust chamber design. The plasma should not be diffused out across the magnetic field duringits expansion. In order to investigate this problem, a three-dimensional PIC code was developed. The examination of the problem is in progress.(4)For the sake of comparison, plasma design study was carried out for a D-^3He fueled/field-reversed configuration (FRC) rocket. It was shown that the D-^3He/FRC rocekt is also one of the promising propulsion systems for manned Mars missions.In addition, some studies relevant to fusion rocket were also made. These include the possibility of using spin-polarized fuels, structural design of rocket system, fueling scheme, and tritium handling in space.

本研究的主要目的是设计一种激光聚变火箭，能够执行载人火星飞行任务，有效载荷为100吨。结果总结如下。（1）首先，对DT靶进行内爆/燃烧模拟，以评估靶增益和所需的激光驱动器能量。阐明了聚变产生的中子和α粒子在点火和燃烧阶段的作用。（<greater than or equal>2）建立了一个二维无碰撞的粒子模拟程序，模拟了DT弹丸微爆产生的等离子体碎片与推力室磁场的相互作用。推力转换效率（动量）是rheta的函数，rheta是从中心轴到磁线圈的夹角。实验结果表明，在0 ℃时，效率有一个宽的最大值<square root>，可达-60%。（3）在推力室设计中所选用的磁轭中，存在着等离子体不稳定性（如Rayleigh-Taylor不稳定性）的可能性。等离子体在膨胀过程中不应穿过磁场向外扩散.为了研究这个问题，开发了一个三维PIC代码。对这个问题的审查正在进行中。（4）为了进行比较，对一种以D-^3He为燃料的FRC火箭进行了等离子体设计研究。结果表明，D-^3He/FRC火箭也是载人火星任务中很有前途的推进系统之一。这些问题包括使用自旋极化燃料的可能性、火箭系统的结构设计、燃料加注方案和空间氚处理。

项目成果

H.Nakashima,et al.: "Neutron Transport in Burning D-T Pellets for Inertial Confinement Fusion" Laser Interaction and Related Plasma Phenomona(Proc.11th Int.Conf.,Monterey,1993). 413-418 (1994)

H.Nakashima 等人：“惯性约束聚变燃烧 D-T 弹丸中的中子传输”激光相互作用和相关等离子体现象（Proc.11th Int.Conf.，Monterey，1993）。

H.Nakashima, et al.: ""Field Reversed Configuration (FRC) Fusion Rocket"" Proc.11th Symp.on Space NuclearPower and Propulsion (Albuquerque, 1994). 1311-1317 (1994)

H.Nakashima 等人：“场反向构型 (FRC) 聚变火箭”Proc.11th Symp.on Space NuclearPower and Propulsion（阿尔伯克基，1994 年）。

H.Nishio, et al.: ""Core Plasma Design for D-^3He/FRC Fusion Propulsion Rocket"(in Japanese)." Technology Reports of Kyushu University. 67[5]. 495-502 (1994)

H.Nishio 等人：“D-^3He/FRC 聚变推进火箭的核心等离子体设计”（日语）。

Y.Nakao, et al.: ""Neutron Interactions in Compressed D-T Pellets for Inertial Confinement Fusion"" Emerging Nuclear Energy Systems (Proc.7th Int.Conf., Chiba, 1993). 117-121 (1994)

Y.Nakao 等人：“用于惯性约束聚变的压缩 D-T 弹丸中的中子相互作用””新兴核能系统（Proc.7th Int.Conf.，千叶，1993）。

H.Nakashima, et al.: ""Neutron Transport in Burning D-T Pellets for Inertial Confinement Fusion"" Laser Interaction and Related Plasma Phenomena (Proc.11th Int.Conf., Monterey, 1993). 413-418 (1994)

H.Nakashima 等人：““惯性约束聚变燃烧 D-T 弹丸中的中子传输””激光相互作用和相关等离子体现象（Proc.11th Int.Conf.，蒙特雷，1993 年）。