玻璃微球内氘结晶行为研究?

尹剑; 陈绍华; 温成伟; 夏立东; 李海容; 黄鑫; 余铭铭梁; 建华; 彭述明

doi:10.7498/aps.64.015202

玻璃微球内氘结晶行为研究?

中国工程物理研究院核物理与化学研究所,绵阳,621900

Crystallization b ehaviors of deuterium in glass microsphere

摘要: 为研制出满足惯性约束聚变(ICF)实验的氘氚(DT)冷冻靶，需要控制DT结晶生长过程，实现DT单晶生长，由此减少影响冰层均匀化及聚变实验的晶体缺陷。本文运用晶体生长形态动力学理论建立了密排六方晶体(hcp)单晶生长模型，实验中通过对靶室进行±3 mK精确控温，采用可见光背光成像技术在线表征了低温下玻璃微球内氘(D2)的结晶生长过程，结果表明：在20—100 Pa低温氦气导热环境下，通过缓慢降温可显著降低氘晶体生长过程中形成的缺陷；当降温速率达到2 mK/min时，观测到了氘燃料的两种单晶生长过程，实验具有可重复性；建立的hcp单晶生长理论模型与实验结果符合，并与美国利弗莫尔国家实验室(LLNL)的DT单晶生长过程进行了对比，提出了冷冻靶内D2/DT燃料的单晶生长方法。

关键词:

Abstract: To develop deuterium-tritium (DT) cryogenic targets that meet the inertial confinement fusion (ICF) experiment requirements, the DT crystal seeding growth process needs to be controlled to obtain single crystalline DT-ice, thus reducing the crystal defects formed during crystal growth and improving ice-layering. In this paper, the close-packed hexagonal (hcp) single crystal growth mode has been established through kinetic theory of crystal growth morphology. Experimentally, the target chamber temperature is controlled to within ±3 mK and the deuterium (D2) crystal growth process can be observed by backlit shadowgraphy. Results show that slow cooling can reduce the crystal defects sig-nificantly at the 20—100 Pa conducting helium pressure. When the cooling rate reaches 2 mK/min, two single crystal growth modes are observed with good reproducibility. Experimental results conform with the proposed hcp single crys-tal growth model. Compared with the results from Lawrence Livermore National Laboratory (LLNL), the methods of D2/DT single crystal growth in the cryogenic target are proposed.

玻璃微球内氘结晶行为研究?

中国工程物理研究院核物理与化学研究所,绵阳,621900

关键词:

Crystallization b ehaviors of deuterium in glass microsphere

中国工程物理研究院核物理与化学研究所,绵阳,621900

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