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Target Fabrication
摘要
High Power Laser Science and Engineering
2017, 5(2): e9
Target Fabrication
摘要
High Power Laser Science and Engineering
2017, 5(1): e5
漆小波  高聪  张占文  李波  魏胜  
收起
摘要
为实现对惯性约束聚变(ICF)靶用空心玻璃微球(HGM)质量及性能的有效调控, 研究了精炼温度对HGM批次产品中A级HGM百分数的影响, 实验测试了不同精炼温度条件下HGM批次的平均直径和壁厚、抗张强度、对氘气的保气性能、表面粗糙度及其随时间的变化。测试结果表明:升高精炼温度并不是总有利于提高HGM的质量和性能;当精炼温度低于1600 ℃时, 满足ICF物理实验参数要求的HGM百分数随着精炼温度的增高而增加, 但是, 当精炼温度高于1600 ℃时, HGM的合格率则随着精炼温度的增高而显著下降;随着精炼温度的升高, HGM的抗拉强度快速提高, 表面粗糙度快速下降;HGM在室温下对氘气的阻气能力快速下降, 且在大气中的潮解速率和程度显著降低。
强激光与粒子束
2012, 24(11): 2607
ICF与激光等离子体
漆小波  唐永建  李波  张占文  [ ... ]陈素芬  师韬  
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摘要
为实现玻璃微球与载气之间传热过程的定量控制,建立了玻璃微球与载气之间的热传递模型,研究了载气组份、温度、压力以及微球直径和壁厚对玻璃微球与载气之间传热过程的影响.结果表明:在干凝胶法制备空心玻璃微球工艺中常用载气组份、温度和压力范围内,载气温度和压力对玻璃微球与载气之间传热阻力的影响都可以忽略,但载气中的氦气含量对微球与载气之间传热阻力的影响很显著.随着微球壁厚的增大,玻璃微球与载气之间传热阻力显著增加.因此,改变载气中的氦气含量可以作为控制微球与载气之间传热过程的有效方法,并且随着微球壁厚的增大,提高载气中的氦气含量对增强载气与微球之间传热性能的作用逐渐增强.
强激光与粒子束
2005, 17(5): 719
ICF与激光等离子体
漆小波  李波  唐永建  张占文  师涛  
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摘要
研究了载气组份、温度、压力以及微球直径和壁厚对液态空心玻璃微球在炉内运动状态的影响.结果表明:在用干凝胶法制备空心玻璃微球工艺的常用载气组份、温度和压力范围内,载气的组份、温度和压力对相同直径和壁厚的液态玻璃微球在炉内运动速度的影响小于8.3%,但载气组份和压力对液态玻璃微球运动雷诺数和韦伯数的影响很显著.玻璃微球的直径和壁厚是液态玻璃微球运动速度、雷诺数和韦伯数的重要影响因素.提高载气中的氦气含量或降低载气压力可以降低载气对液态玻璃微球的非球形化作用,提高载气温度可以降低其球形化的阻力.
强激光与粒子束
2005, 17(4): 543
实验技术与元件
周 斌  王 珏  沈 军  张玉龙  陈玲燕  
收起
摘要
介绍了以激光干涉法形成正弦调制起伏图形,结合电镀图形转移工艺获得了图形模板,采用旋转涂覆等工艺将调制图形转移至掺溴聚苯乙烯薄膜的表面,获得了掺溴聚苯乙烯平面调制箔靶。研究了调制起伏图形的精确转移工艺,以SEM和台阶仪监控图形转移过程,控制耦合在调制图形上的表面粗糙度。
中国激光
1999, 26(10): 878
Early Posting
摘要
The interaction of intense, ultrashort laser pulses with ordered nanostructure arrays offers a path to the efficient creation of ultra-high energy density (UHED) matter and the generation of high energy particles with compact lasers. Irradiation of deuterated nanowires arrays results in a near-solid density environment with extremely high temperatures and large electromagnetic fields in which deuterons are accelerated to multi-MeV energies, resulting in deuterium-deuterium (D-D) fusion. Here we focus on the method of fabrication and the characteristics of ordered arrays of deuterated polyethylene nanowires. The irradiation of these array targets with femtosecond pulses of relativistic intensity and Joule-level energy creates a micro-scale fusion environment that produced 2×10<sup>6</sup> neutrons per joule, an increase of about 500 times with respect to flat solid CD<sub>2</sub> targets irradiated with the same laser pulses. Irradiation with 8 J laser pulses was measured to generate up to 1.2×10<sup>7</sup> D-D fusion neutrons per shot.
High Power Laser Science and Engineering
0, ():
Early Posting
摘要
Resorcinol/formaldehyde (RF) foam resin is an attractive material as a low–density target in high power laser plasma experiments because of its fine network structure, transparency in the visible region, and low Z element (hydrogen, carbon, and oxygen) composition. In this study, we developed disk–shaped RF foam and deuterated RF foam targets with from 40 µm to 200 µm thickness and ~100 mg/cc density having a network structure from 100 nm to a few µm cell size. By deuteration, the polymerization rate was drastically slowed down due to kinetic isotope effects. These targets were used in high power laser experiments where a MeV proton beam was successfully generated.
High Power Laser Science and Engineering
0, ():
Early Posting
摘要
Carbon nanotube foams (CNFs) have been successfully used as near-critical-density targets in the laser-driven acceleration of high-energy ions and electrons. Here we report the recent advance in the fabrication technique of such targets. With the further developed floating catalyst chemical vapor deposition (FCCVD) method, large-area (>25 cm<sup>2</sup>) and highly uniform CNFs are successfully deposited on nanometer-thin metal or plastic foils as double-layer targets. The density and thickness of the CNF can be controlled in the range of 1-13 mg/cm<sup>3</sup> and 10-200 μm, respectively, by varying the synthesis parameters. The dependence of the target properties on the synthesis parameters and the details of the target characterization methods are presented for the first time.
High Power Laser Science and Engineering
0, ():
Early Posting
摘要
As an attractive collector medium for hypervelocity particles, combined with outstanding physical properties and suitable compositional characteristics, SiO2 aerogel has been deployed on outer space missions and laser shock-loaded collection experiments. In this paper, impact experiments were conducted in order to understand the penetration process of irregular grains, irregular Al2O3 grains with different sizes and speed (~110um@7km/s, ~251um@2.3km/s) at various density silica aerogels. By classifying shapes of projectile residues and track, the morphology of tracks was analyzed. It was observed that there were several kinds of typical tracks in the penetration of irregular grains, accompanied by residues with the shapes of Near-Sphere, Polyhedron, Streamlined body Wedge and Rotator. The rotational behavior was demonstrated by the final status of one flake projectile as a direct evidence. Also, there was no obvious relationship between track length and experimental parameters, which may be caused by the uncertain interaction between aerogels and irregular particles. In addition, it confirmed the existence of fragmentation, melting situation by observing the shape of the impact entrance hole. At the same time, optical coherence tomography was used to observe the detail of tracks clearly, which provided a method to character the tracks nondestructively.
High Power Laser Science and Engineering
0, ():
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