Μicro-structured tungsten: an advanced plasma-facing material
Μicro-structured tungsten: an advanced plasma-facing material
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DOI：
10.1016/j.nme.2019.02.007
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发表时间：
2019-05
影响因子：
2.6
通讯作者：
A. Terra;G. Sergienko;M. Tokar;D. Borodin;T. Dittmar;A. Huber;A. Kreter;Y. Martynova;S. Möller;M. Rasinski;M. Wirtz;T. Loewenhoff;D. Dorow-Gerspach;Y. Yuan;S. Brezinsek;B. Unterberg;C. Linsmeier
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文献类型：
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作者：
A. Terra;G. Sergienko;M. Tokar;D. Borodin;T. Dittmar;A. Huber;A. Kreter;Y. Martynova;S. Möller;M. Rasinski;M. Wirtz;T. Loewenhoff;D. Dorow-Gerspach;Y. Yuan;S. Brezinsek;B. Unterberg;C. Linsmeier
钨等离子体表面的微结构可以显著降低ELM热流引起的近表面热应力。借助有限元分析软件进行了数值模拟，验证了该方法的有效性。为了进行实验测试，制作了两个10 × 10 mm~2的微结构钨样品。其中包括2,000根垂直堆积的钨纤维和5,000根垂直堆积的钨纤维，尺寸分别为？240微米 × 2.4 毫米和？150微米 × 2.4 毫米。纤维的1.2 mm底部嵌入铜基中。光纤的顶部有大约10 微米的间隙，因此它们不会相互接触。所有钨纤维的顶部都是电抛光的。用脉冲宽度为1 ms、脉冲重复频率为25 Hz的脉冲激光模拟了高达105个ELM类热脉冲。两个微结构钨样品均未观察到损伤。微结构钨样品的Ne等离子体烧蚀速率和燃料保持率与块体钨样品基本相同。
A micro-structuring of the tungsten plasma-facing surface can strongly reduce near surface thermal stresses induced by ELM heat fluxes. This approach has been confirmed by numerical simulations with the help of ANSYS software. For experimental tests, two 10 × 10 mm2samples of micro-structured tungsten were manufactured. These consisted of 2000 and 5000 vertically packed tungsten fibres with dimensions of Ø240 µm × 2.4 mm and Ø150 µm × 2.4 mm, respectively. The 1.2 mm bottom parts of the fibres are embedded in a copper matrix. The top parts of the fibres have gaps about of 10 µm so they are not touching each others. The top of all tungsten fibres was electro-polished. A Nd:YAG laser with a pulse duration 1 ms and a pulse repetition frequency of 25 Hz was used to simulate up to 105ELM-like heat pulses. No damage on either of the micro-structured tungsten samples were observed. Neon plasma erosion rate and fuel retention of the micro-structured tungsten samples were almost identical to bulk tungsten samples.