Hydrogen retention of JT-60 open divertor tiles exposed to HH discharges
Hydrogen retention of JT-60 open divertor tiles exposed to HH discharges
复制标题
DOI：
10.1088/0029-5515/46/10/001
复制
发表时间：
2006-10
期刊：
影响因子：
3.3
通讯作者：
T. Shibahara;Tetsuo Tanabe;Y. Hirohata;Y. Oya;M. Oyaidzu;A. Yoshikawa;Y. Onishi;T. Arai;K. Masaki;K. Okuno;N. Miya
中科院分区：
文献类型：
--
作者：
T. Shibahara;Tetsuo Tanabe;Y. Hirohata;Y. Oya;M. Oyaidzu;A. Yoshikawa;Y. Onishi;T. Arai;K. Masaki;K. Okuno;N. Miya
用热脱附谱（TDS）研究了JT-60开放偏滤器上氢放电对石墨瓦中氢的滞留。大部分面向等离子体的区域都覆盖着再沉积层，最大厚度约为70微米，出现在偏滤器内部区域。绝大部分氢以氢分子的形式热脱附，其峰值温度约为970 K。几乎所有的氢原子都均匀地保留在再沉积层中，平均氢浓度为0.03（H/C = 0.4-1.0），这远小于饱和氢浓度。由于碳材料中的饱和氢浓度随着温度的升高而降低，因此再沉积的碳层很可能在放电期间经受更高的温度，这由TDS中氢的更高释放温度支持。这一结果表明，氢保留可以显着降低较高的壁温。
Hydrogen retention in graphite tiles exposed to hydrogen discharges at the JT-60 open divertor has been investigated by means of thermal desorption spectroscopy (TDS). Most of the plasma facing area was covered with re-deposited layers of maximum thickness of about 70 µm appearing at the inner divertor region. Major parts of retained hydrogen were thermally desorbed as hydrogen molecules with a peak temperature of around 970 K. Almost all the hydrogen atoms were retained homogeneously in the re-deposited layers with an averaged hydrogen concentration of ∼0.03 in H/C, which is much smaller than the saturated hydrogen concentration (H/C = 0.4–1.0). Since the saturated hydrogen concentration in carbon materials decreases with increasing temperature, the re-deposited carbon layers are very likely subjected to higher temperatures during the discharges, which are supported by the higher release temperature of hydrogen in TDS. This result suggests that hydrogen retention can be significantly reduced with higher wall temperatures.