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Thermo-Mechanical Calculation of Vacuum Plasma Spraying Tungsten Coating as the Plasma Facing Material for Tokamak Device

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Plasma Science and Technology 2012年第9期14卷 794-798页

作者：朱大焕刘洋陈俊凌鄢容 Institute of Plasma Physics Chinese Academy of Sciences

Thermo-mechanical simulation of the vacuum plasma spraying tungsten （VPS-W） coating on the actively cooled CuCrZr substrate under the relevant quasi-stationary heat load and transient heat flux for tokamak device, is conducted by finite element analysis （FEA）. It is shown that the failure of copper softening is likely to occur at the W/Cu compliant interlayer under a typical quasi-stationary heat load and the surface failure of plastic yield damage to occur at the surface edge under a transient heat flux. In addition, the critical transient heat flux for melting is approximately 0.75 MJ/m2 for about 0.5 ms. All these results are useful for the design of the plasma facing components （PFCs） and the plasma operation in the future.

关键词： VPS-W coating heat load transient flux finite element analysis

Influence of Erosion and Deposition on Metallic First Mirror in HT-7 Tokamak

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Plasma Science and Technology 2012年第8期14卷 708-711页

作者：陈聚鄢容陈俊凌 Institute of Plasma Physics Chinese Academy of Sciences

Abstract Dedicated experiments in the HT-7 tokamak were performed to investigate the in- fluence of erosion and deposition on the mirror samples. The first mirror （FM） samples made of polyerystalline （PC） stainless steel （SS）, molybdenum （Mo） and tungsten （W） were fixed on a holder at an angle of 45° with respect to the horizontal plane and set at different locations with different connection lengths along the magnetic field. The optical reflectivity of the first mirror was measured by a spectrophotometer before and after plasma exposure. It was found that the surface morphology and specular reflectivity of the mirror samples after the exposure were different with respect to the different distances from the mirror surface to the last closed flux surface （LCFS） of the plasma in the tokamak. It was also found that shortening the connection length before the mirror surface would weaken the influence of the plasma erosion and impurity deposition on the mirror surface. In order to maintain the optical characteristics of the mirror surface, it is necessary to adopt the in-situ cleaning and mirror protection techniques.

关键词： first mirror erosion deposition reflectivity surface morphology

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等离子体辐照对第一镜表面反射率的影响研究

表面技术 2010年第4期39卷 30-32页

作者：陈聚鄢容陈俊凌中国科学院等离子体物理研究所合肥230031

研究了多晶钼、钨第一镜样品经等离子体辐照前后的表面形貌及反射率变化。实验结果表明:第一镜表面的各个部位在石墨限制器以下所处的区域不同,经等离子体辐照后,处于沉积区的镜面比处于腐蚀区的镜面相对平滑,反射率也相对较高,此外,在... 详细信息

研究了多晶钼、钨第一镜样品经等离子体辐照前后的表面形貌及反射率变化。实验结果表明:第一镜表面的各个部位在石墨限制器以下所处的区域不同,经等离子体辐照后,处于沉积区的镜面比处于腐蚀区的镜面相对平滑,反射率也相对较高,此外,在保持表面反射率性能方面,钨第一镜样品要优于钼第一镜样品。

关键词：第一镜反射率腐蚀沉积

Exposure of W-TiC/Cu Functionally Graded Materials in the Edge Plasma of HT-7 Tokamak

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Plasma Science and Technology 2012年第2期14卷 177-180页

作者：刘洋朱大焕陈俊凌周张健鄢容 Institute of Plasma Physics Chinese Academy of Sciences University of Science and Technology Beijing

Six-layered W-TiC/Cu functionally graded materials were fabricated by resistance sintering under ultra-high pressure and exposed in the edge plasma of HT-7 tokamak. Microstruc- ture morphologies show that the TiC particles distribute homogeneously in the W matrix, strength- ening the grain boundary, while gradient layers provide a good compositional transition from W- TiC to Cu. After about 360 shots in the HT-7 tokamak, clear surface modification can be observed after plasma exposure, and the addition of nano TiC particles is beneficial to the improvement of plasma loads resistance of W.

关键词： W-TiC resistance sintering HT-7 tokamak plasma exposure

Surface Cracking Behaviors of Ultra-Fine Grained Tungsten Under Edge Plasma Loading in the HT-7 Tokamak

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Plasma Science and Technology 2013年第6期15卷 605-608页

作者：朱大焕刘洋陈俊凌周张健鄢容 Institute of Plasma Physics Chinese Academy of Sciences University of Science and Technology Beijing

Tests of the candidate plasma facing materials（PFMs） used in experimental fusion devices are essential due to the direct influence of in-situ plasma loading.A type of ultrafine grained（UFG） tungsten sintered by resistance sintering under ultra-high pressure（RSUHP） method has been exposed in the edge plasma of the HT-7 tokamak to investigate its performance under plasma *** cychc edge plasma loading,the UFG tungsten develops both macro and micro *** macro cracks are attributed to the low temperature brittleness of the tungsten material itself,while the micro cracks are generated from local intense power flux deposition.

关键词： ultra-fine grain tungsten plasma facing materials cracking behaviors plasma irradiation

Deposition Mitigation of the First Mirrors Exposed in EAST with Metal and Carbon Mixed Wall Materials

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Plasma Science and Technology 2014年第9期16卷 885-889页

作者：鄢容陈俊凌陈龙威朱大焕 Institute of Plasma Physics Chinese Academy of Sciences

In order to investigate the effect of aperture geometry on deposition mitigation, stainless steel （SS） first mirrors （FMs） were fixed on the holders of protective aperture geometry with different depth-diameter ratios （DDRs） and exposed in the deposition dominated environment of EAST. A baffle was used during the wall conditioning. The surface properties and reflectivity of the FMs were characterized before and after exposure. It is shown that using aperture geometry and a baffle can effectively mitigate the impurities deposition. The degradation of the surface and specular reflectivity of the FMs is reduced with the increase of DDRs in the range of 0 to 2. The main contaminated elements in a low-Z and high-Z mixed wall materials environment were still carbon and oxygen.

关键词： deposition mitigation specular reflectivity first mirror EAST

Cleaning of HT-7 Tokamak Exposed First Mirrors by Radio Frequency Magnetron Sputtering Plasma

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Plasma Science and Technology 2014年第12期16卷 1158-1162页

作者：鄢容陈俊凌陈龙威丁锐朱大焕 Institute of Plasma Physics Chinese Academy of Sciences

The stainless steel （SS） first mirror pre-exposed in the deposition-dominated envi- ronment of the HT-7 tokamak was cleaned in the newly built radio frequency （RF） magnetron sputtering plasma device. The deposition layer on the FM surface formed during the exposure was successfully removed by argon plasma with a RF power of about 80 W and a gas pressure of 0.087 Pa for 30 min. The total reflectivity of the mirrors was recovered up to 90% in the wavelength range of 300-800 nm, while the diffuse reflectivity showed a little increase, which was attributed to the increase of surface roughness in sputtering, and residual contaminants. The FMs made from single crystal materials could help to achieve a desired recovery of specular reflectivity in the future.

关键词： radio frequency plasma sputtering first mirror cleaning

W-TiC/Cu FGM的制备及其在HT-7托卡马克中的辐照性能研究

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W-TiC/Cu FGM的制备及其在HT-7托卡马克中的辐照性能研究

基于卷积神经网络的第一镜表面杂质沉积状态识别研究

第十五届全国等离子体科学技术会议

作者：刘洋朱大焕陈俊凌周张健鄢容中国科学院等离子体物理研究所北京科技大学

钨(W)具有较高的熔点、低的氚滞留、低的溅射腐蚀率、以及良好的抗等离子体冲刷能力,是目前最有前景的面向等离子体第一壁材料。但是,纯钨存在低温脆性、高温条件下的再结晶脆化以及中子辐照下的脆化等缺点;同时作为护甲材料的钨与作为... 详细信息

钨(W)具有较高的熔点、低的氚滞留、低的溅射腐蚀率、以及良好的抗等离子体冲刷能力,是目前最有前景的面向等离子体第一壁材料。但是,纯钨存在低温脆性、高温条件下的再结晶脆化以及中子辐照下的脆化等缺点;同时作为护甲材料的钨与作为热沉材料的铜合金之间存在热膨胀系数和杨氏模量的巨大失配,将导致连接界面的热应力集中和热疲劳失效。研究表明,TiC纳米弥散颗粒的加入可以有效改善钨的低温脆性和提高再结晶温度,同时,梯度过渡层可有效缓解连接界面的应力集中。本文采用通电超高压烧结的方法制备出了具有6层结构的W-TiC/Cu功能梯度材料。微观结构观察显示,TiC颗粒在钨基体中弥散分布均匀,对晶界可起到显著的强化效果;同时,梯度层中无明显铜的迁移,实现了钨合金向纯铜的成分过渡,有效缓解界面热失配。W-TiC/Cu功能梯度材料在HT-7托卡马克边界等离了体中经历360次短脉冲放电(每次约0.8秒)后的结果显示,纳米TiC的加入可以阻止微裂纹的扩展。然而,在过渡层的界面上没有发现微观裂纹,表明梯度层界面能够承受此类等离子体热冲击疲劳。但W-TjC/Cu功能梯度材料的抗等离子体辐照性能仍需在主动水冷情况下,检验其在长脉冲、高参数和准稳态等离子体环境下的稳定性与可靠性。

关键词： W-TiC 功能梯度材料通电超高压烧结 HT-7托卡马克

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西北师范大学学报（自然科学版） 2023年第2期59卷 61-66页

作者：徐苏鄢容刘玉明穆磊盛鹏郑薇王晨雪陈俊凌合肥学院人工智能与大数据学院安徽合肥230601 中国科学院合肥物质科学研究院等离子体物理研究所安徽合肥230031 中国科学技术大学研究生院科学岛分院安徽合肥230021

第一镜是托卡马克光学诊断系统最重要的光学元件之一,强烈的等离子体与壁相互作用导致第一镜表面出现的杂质沉积会严重影响第一镜反射率和相关光学诊断系统的准确性和有效性,因此准确判别第一镜表面杂质沉积状态对于实时获取并采取有效... 详细信息

第一镜是托卡马克光学诊断系统最重要的光学元件之一,强烈的等离子体与壁相互作用导致第一镜表面出现的杂质沉积会严重影响第一镜反射率和相关光学诊断系统的准确性和有效性,因此准确判别第一镜表面杂质沉积状态对于实时获取并采取有效手段恢复第一镜反射率至关重要.文中采用非平衡磁控溅射等离子体方法制备纳米晶钼材料第一镜,在此基础上利用电子束蒸发镀膜方法在其表面沉积氧化铝非晶涂层,利用分光光度计测得有、无氧化铝沉积膜的钼第一镜全反射率,并通过数据增强方法对原始数据集进行数据扩充,结合卷积神经网络对杂质沉积第一镜的全反射率数据集进行识别、分类.结果表明,当卷积神经网络模型迭代次数为50时,模型分类准确性达到最佳状态,并在包含均值为0,方差为1高斯噪声的数据集中验证了一维卷积神经网络的抗噪能力.最终实现有、无氧化铝沉积膜的钼第一镜分类,正确率达到98.85%,这为在封闭托卡马克环境下的第一镜表面原位清洗与杂质沉积状态识别提供了一种可能的新方法.

关键词：托卡马克第一镜反射率识别一维卷积神经网络