| Autor: |
May, M.J., Finkenthal, M., Regan, S.P., Moos, H.W., Terry, J.L., Goetz, J.A., Graf, M.A., Rice, J.E., Marmar, E.S., Fournier, K.B., Goldstein, W.H. |
| Zdroj: |
Nuclear Fusion; June 1997, Vol. 37 Issue: 6 p881-896, 16p |
| Abstrakt: |
The intrinsic impurity content of molybdenum and carbon was measured in the Alcator C-Mod tokamak using low resolution, multilayer mirror (MLM) spectroscopy ( Delta lambda ~1-10 AA). Molybdenum was the dominant high-Z impurity and originated from the molybdenum armour tiles covering all of the plasma facing surfaces (including the inner column, the poloidal divertor plates and the ion cyclotron resonant frequency (ICRF) limiter) at Alcator C-Mod. Despite the all metal first wall, a carbon concentration of 1 to 2% existed in the plasma and was the major low-Z impurity in Alcator C-Mod. Thus, the behaviour of intrinsic molybdenum and carbon penetrating into the main plasma and the effect on the plasma must be measured and characterized during various modes of Alcator C-Mod operation. To this end, soft X-ray extreme ultraviolet (XUV) emission lines of charge states, ranging from hydrogen-like to helium-like lines of carbon (radius/minor radius, r/a~1) at the plasma edge to potassium to chlorine-like (0.4 |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
|
