Effect of plasma configuration on carbon migration measured in the inner divertor of JET using quartz microbalance
Effect of plasma configuration on carbon migration measured in the inner divertor of JET using quartz microbalance
复制标题
使用石英微天平在 JET 内偏滤器中测量等离子体配置对碳迁移的影响
DOI：
10.1016/j.jnucmat.2004.10.112
复制
发表时间：
2005
影响因子：
3.1
通讯作者：
G. Neill
中科院分区：
文献类型：
--
作者：
H. Esser;V. Philipps;M. Freisinger;G. Matthews;J. Coad;G. Neill
用石英微天平（QMB）测量了JET内偏滤器百叶窗区在各种偏滤器条件下806次（共6479 s）的碳沉积。通过快门控制曝光时间。从测量开始到结束，沉积晶体的总积分频移为23640 Hz，对应的平均碳沉积通量为5.5×10 - 8 g/cm 2s或2.8× 1015 C/cm 2s。将此外推到使用MKII GB SRP偏滤器（带有隔板更换板的气箱偏滤器）的偏滤器等离子体的26.4小时的总时间，得到沉积在百叶窗区域上的碳层总量为35.4 g。结果发现，随着撞击点位置到百叶窗入口的距离的减小，沉积显著增加。在QMB上形成碳层的主要原因是入射点在水平靶上的Elmy-H模式放电。
The deposition of carbon in the louvre area of the inner divertor of JET was measured by means of a Quartz Microbalance diagnostic (QMB) during 806 exposures (total of about 6479s) in various divertor conditions. Exposure time was controlled by means of a shutter. The overall integrated frequency shift of the deposition crystal from the start of the measurements to the end was 23640Hz, corresponding to an average carbon deposition flux of 5.5×10−8g/cm2s or 2.8×1015C/cm2s. Extrapolating this to the total time of 26.4 hours of divertor plasmas with the MKII GB SRP divertor (gas box divertor with septum replacement plate) yields a total amount of 35.4g of carbon layers deposited on the louvre region. It was found that the deposition increases significantly with decreasing distance of the strike point position to the louvre entrance. Elmy-H-mode discharges with the strike point on the horizontal target dominate the carbon layer formation on the QMB.