REDISTRIBUTION OF SOLID FUEL LAYER IN LASER FUSION TARGET BY ELECTRODE-LESS DISCHARGE OF MICROWAVE

微波无极放电激光聚变靶中固体燃料层的重新分布

• 批准号: 06680478
• 负责人: NORIMATSU Takayoshi
• 金额: $ 1.34万
• 依托单位: OSAKA 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: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06680478/
• 关键词: LASER FUSION; FUEL PELLET; CRYOSTAT; TARGET; MICROWAVE; GLOW DISCHARGE; SMOOTHING; SOLID HYDROGEN; マイクロ波放電; 無電極グロー放電

Plasma layring technique to make a cryogenic target for a laser fusion reactor has been developed. A 6-mm-diameter quartz shell housed in a microwave cavity was cooled to 10 K to freeze appropriate amount of deuterium inside. A nonuniform solid deuterium layr in the shell was successfully redistributed into uniform one by initiating a glow discharge in the void.1) The time constant for redistribution was 80 second. This time constant is much less than that driven by heat initiated by tritium decays. This short time constant is beneficial for the future laser-fusion reactor-system since it can reduce the tritium inventory in a pellet factory.2) The time constant for redistribution is primary determined by cooling performance of the shell and the time constant has week dependence on the power of the microwave. Reducing the temperature of the cooling helium is most effective to shorten the time constant.3) Solid deuterium, which was initially opaque due to cracks, turned into transparent by heating with the glow discharge. Cracks in the solid were removed toward the heat source through a sublimation / deposition cycle. This is an important result to obtain a high quality solid fuel layr for the laser fusion target.

用于制造激光聚变反应堆低温靶的等离子体铺设技术已经开发出来。将微波腔内的直径 6 mm 的石英壳冷却至 10 K，以在内部冻结适量的氘。通过在空隙中引发辉光放电，壳内不均匀的固体氘层成功地重新分布为均匀的氘层。1）重新分布的时间常数为80秒。该时间常数远小于氚衰变引发的热量驱动的时间常数。这种短的时间常数对于未来的激光聚变反应堆系统是有益的，因为它可以减少球团厂中的氚库存。2）重新分配的时间常数主要由壳体的冷却性能决定，并且时间常数对微波功率的依赖性较小。降低冷却氦气的温度对于缩短时间常数是最有效的。3)最初由于裂纹而不透明的固体氘，通过辉光放电加热而变成透明的。通过升华/沉积循环，固体中的裂纹被移向热源。这是为激光聚变靶材获得高质量固体燃料层的重要成果。

项目成果

C. M. Chen, T. Norimatsu, Y. Izawa, T. Yamanaka, and S. Nakai: "Heating uniformity of a microwave discharge plasma to redistribute a solid fuel layer inside a cryogenic target for inertial confinement fusion" Journal of Vacuum Science and Technology A. 13

C. M. Chen、T. Norimatsu、Y. Izawa、T. Yamanaka 和 S. Nakai：“微波放电等离子体的加热均匀性，以重新分布惯性约束聚变低温靶内的固体燃料层”真空科学与技术杂志 A

C.M.CHEN: "HEATING UNIFORMITY OF A MICROWAVE OF A MICROWAVE DISCHARGE PLASMA TO REDISTRIBUTE A SOLID FUEL LAYER INSIDE A CRYOGENIC TARGET FOR INERTIAL CONFINEMENT FUSION" J.VAC.SCI.TECHNOL.A.

C.M.CHEN：“微波放电等离子体的微波加热均匀性以重新分布低温靶内的固体燃料层以进行惯性约束聚变”J.VAC.SCI.TECHNOL.A。

T.Norimatsu: "Cryogenic targets and related technologies at ILE Osaka university" Journal of Vacuum Science and Technology. 12. 1293-1301 (1994)

T.Norimatsu：“大阪大学 ILE 的低温靶材及相关技术”《真空科学与技术杂志》。

C.M.Chen: "Heating uniformity of a microwave discharge plasma to redistribute a solid fuel layer inside a cryogenic target for inertial confinement fusion" Journal of Vacuum Science and Technologh A. 13. 2908-2913 (1995)

C.M.Chen：“微波放电等离子体的加热均匀性，以重新分布惯性约束聚变低温靶内的固体燃料层”真空科学与技术期刊 A. 13. 2908-2913 (1995)