Impurity Control Techniques Developed at General Atomic Company for Large Tokamaks
The problem of impurity accumulation in a tokamak and some possible control techniques to counteract such problems are reviewed. The techniques discussed are primarily those that have been studied at General Atomic Company (GA). The possible application of such impurity control techniques in the fut...
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| Published in: | IEEE transactions on plasma science Vol. 9; no. 3; pp. 85 - 92 |
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| Main Author: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
IEEE
01-01-1981
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| Abstract | The problem of impurity accumulation in a tokamak and some possible control techniques to counteract such problems are reviewed. The techniques discussed are primarily those that have been studied at General Atomic Company (GA). The possible application of such impurity control techniques in the future Engineering Test Facility (ETF) is also discussed. |
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| AbstractList | The problem of impurity accumulation in a tokamak and some possible control techniques to counteract such problems are reviewed. The techniques discussed are primarily those that have been studied at General Atomic Company (GA). The possible application of such impurity control techniques in the future Engineering Test Facility (ETF) is also discussed. The accumulation of contaminant ions in fusion plasmas during startup and burn can create unfavorable operating conditions. It is, therefore, important to control impurities in the plasma. Procedures considered for such a control include techniques for inhibiting their flow in the plasma. The reported survey includes a brief study of such techniques and their possible applicability to a reactor plasma. The techniques discussed are related to impurity flow reversal, gas blanket, modification of transport at the plasma edge, and a simplified divertor concept, the expanded boundary configuration. A brief description is given of the tolerable level of impurities. The various particle and energy fluxes from the plasma are discussed, taking into account how they are influenced by the available external control methods. |
| Author | Bhadra, D. K. |
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| Cites_doi | 10.1063/1.862498 10.1088/0029-5515/19/12/010 10.1063/1.862382 10.1103/PhysRevLett.41.1382 10.1585/jspf1958.32.67 10.1016/0022-3115(78)90179-4 10.1088/0029-5515/12/6/010 10.1088/0029-5515/19/11/012 10.1088/0029-5515/18/4/006 10.1088/0029-5515/17/6/007 10.1103/PhysRevLett.40.1649 10.1088/0029-5515/20/1/004 10.1088/0029-5515/17/3/020 10.1103/PhysRevLett.39.615 |
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| EndPage | 92 |
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| References | ref11 ref10 ref13c ref9b ref13d ref13a ref1 ref13b ohyabu (ref4) 1979 ref9a ref8 murakami (ref2a) 1979 ref3 ref2b ref6 (ref12) 1978; 2 ref5 moeller (ref7) 1980 |
| References_xml | – year: 1980 ident: ref7 publication-title: Time-dependent measurements of ion impurity densities in a tokamak discharge using laser induced fluorescence contributor: fullname: moeller – ident: ref13c doi: 10.1063/1.862498 – ident: ref13d doi: 10.1088/0029-5515/19/12/010 – ident: ref13b doi: 10.1063/1.862382 – ident: ref11 doi: 10.1103/PhysRevLett.41.1382 – year: 1979 ident: ref2a publication-title: Proc Plasma Physics and Controlled Nuclear Fusion Research Conf contributor: fullname: murakami – ident: ref10 doi: 10.1585/jspf1958.32.67 – ident: ref2b doi: 10.1016/0022-3115(78)90179-4 – ident: ref3 doi: 10.1088/0029-5515/12/6/010 – volume: 2 year: 1978 ident: ref12 publication-title: Operating scenarios – ident: ref9b doi: 10.1088/0029-5515/19/11/012 – ident: ref5 doi: 10.1088/0029-5515/18/4/006 – ident: ref1 doi: 10.1088/0029-5515/17/6/007 – ident: ref8 doi: 10.1103/PhysRevLett.40.1649 – ident: ref13a doi: 10.1088/0029-5515/20/1/004 – ident: ref9a doi: 10.1088/0029-5515/17/3/020 – year: 1979 ident: ref4 publication-title: Expanded boundary approach to impurity control in tokamaks contributor: fullname: ohyabu – ident: ref6 doi: 10.1103/PhysRevLett.39.615 |
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| Snippet | The problem of impurity accumulation in a tokamak and some possible control techniques to counteract such problems are reviewed. The techniques discussed are... The accumulation of contaminant ions in fusion plasmas during startup and burn can create unfavorable operating conditions. It is, therefore, important to... |
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| StartPage | 85 |
| SubjectTerms | Ash Helium Impurities Inductors Plasma stability Plasma temperature Plasma transport processes Sputtering Test facilities Tokamaks |
| Title | Impurity Control Techniques Developed at General Atomic Company for Large Tokamaks |
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