Abstract
The problem of impurities in fusion plasmas has been recognized since the beginning of the fusion programme. Early experiments in glass vacuum vessels released gas from the wall to such an extent that the radiation from the impurities prevented the plasma from being heated above about 50 eV. The radiative power loss is principally due to line radiation from partially stripped ions, which is particularly a problem during the plasma startup phase. Another problem is fuel dilution, which arises because impurity atoms produce many electrons and, for a given plasma pressure, these electrons take the place of fuel particles. Impurities can also lead to disruptions, as a result of edge cooling and consequent current profile modification. The fractional impurity level which radiates 10% of the total thermonuclear power for a 10 keV plasma is 50% for helium, 7% for carbon, and less than 0.1% for molybdenum. Clearly, impurities of low atomic number are a much less serious problem than those of high atomic number. (author)
Li, J;
Chen, J L;
[1]
Guo, H Y;
[2]
Institute of Plasma Physics, Chinese Academy of Sciences (China)];
McCracken, G M
[3]
- Institute of Plasma Physics, Chinese Academy of Sciences (China)
- Tri Alpha Energy (United States)
- Culham Science Centre, UKAEA, Abingdon (United Kingdom)
Citation Formats
Li, J, Chen, J L, Guo, H Y, Institute of Plasma Physics, Chinese Academy of Sciences (China)], and McCracken, G M.
Plasma-Wall Interactions.
IAEA: N. p.,
2012.
Web.
Li, J, Chen, J L, Guo, H Y, Institute of Plasma Physics, Chinese Academy of Sciences (China)], & McCracken, G M.
Plasma-Wall Interactions.
IAEA.
Li, J, Chen, J L, Guo, H Y, Institute of Plasma Physics, Chinese Academy of Sciences (China)], and McCracken, G M.
2012.
"Plasma-Wall Interactions."
IAEA.
@misc{etde_22028537,
title = {Plasma-Wall Interactions}
author = {Li, J, Chen, J L, Guo, H Y, Institute of Plasma Physics, Chinese Academy of Sciences (China)], and McCracken, G M}
abstractNote = {The problem of impurities in fusion plasmas has been recognized since the beginning of the fusion programme. Early experiments in glass vacuum vessels released gas from the wall to such an extent that the radiation from the impurities prevented the plasma from being heated above about 50 eV. The radiative power loss is principally due to line radiation from partially stripped ions, which is particularly a problem during the plasma startup phase. Another problem is fuel dilution, which arises because impurity atoms produce many electrons and, for a given plasma pressure, these electrons take the place of fuel particles. Impurities can also lead to disruptions, as a result of edge cooling and consequent current profile modification. The fractional impurity level which radiates 10% of the total thermonuclear power for a 10 keV plasma is 50% for helium, 7% for carbon, and less than 0.1% for molybdenum. Clearly, impurities of low atomic number are a much less serious problem than those of high atomic number. (author)}
place = {IAEA}
year = {2012}
month = {Sep}
}
title = {Plasma-Wall Interactions}
author = {Li, J, Chen, J L, Guo, H Y, Institute of Plasma Physics, Chinese Academy of Sciences (China)], and McCracken, G M}
abstractNote = {The problem of impurities in fusion plasmas has been recognized since the beginning of the fusion programme. Early experiments in glass vacuum vessels released gas from the wall to such an extent that the radiation from the impurities prevented the plasma from being heated above about 50 eV. The radiative power loss is principally due to line radiation from partially stripped ions, which is particularly a problem during the plasma startup phase. Another problem is fuel dilution, which arises because impurity atoms produce many electrons and, for a given plasma pressure, these electrons take the place of fuel particles. Impurities can also lead to disruptions, as a result of edge cooling and consequent current profile modification. The fractional impurity level which radiates 10% of the total thermonuclear power for a 10 keV plasma is 50% for helium, 7% for carbon, and less than 0.1% for molybdenum. Clearly, impurities of low atomic number are a much less serious problem than those of high atomic number. (author)}
place = {IAEA}
year = {2012}
month = {Sep}
}