E. Surrey M. Porton A. Caballero T. Davenne D. Findlay A. Letchford J. Thomason J. Marrow S. Roberts Andrei Seryi B. Connolly P. Mummery H. Owen
The erosion and high neutron flux in a fusion power plant results in the need for frequent remote replacement of the plasma facing components. This is a complex and time consuming remote handling operation and its duration directly affects the availability and therefore the commercial viability of the power plant. A tool is needed to allow the main…
PublishedE. Surrey M. Porton A. Caballero T. Davenne D. Findlay A. Letchford J. Thomason J. Marrow S. Roberts Andrei Seryi B. Connolly P. Mummery H. Owen
The need to populate the fusion materials engineering data base has long been recognized, the IFMIF facility being the present proposed neutron source for this purpose. Re-evaluation of the regulatory approach for the EU proposed DEMO device shows that the specification of the neutron source can be reduced with respect to IFMIF, allowing lower risk…
PublishedE. Surrey M. Porton T. Davenne D. Findlay A. Letchford J. Thomason S.G. Roberts J. Marrow A. Seryi B. Connolly H. Owen
The materials engineering data base relevant to fusion irradiation is poorly populated and it has long been recognized that a fusion spectrum neutron source will be required, the facility IFMIF being the present proposal. Reevaluation of the regulatory approach for the EU proposed DEMO device shows that the purpose of the source can be changed from…
PublishedE. Surrey M. Porton T. Davenne D. Findlay A. Letchworth J. Thomason S.G. Roberts J. Marrow,
The materials engineering data base relevant to fusion irradiation is poorly populated and it has long been recognized that a fusion spectrum neutron source will be required, the facility IFMIF being the present proposal. Re-evaluation of the regulatory approach for the EU proposed DEMO device shows that the purpose of the source can be changed fro…
PublishedE. Surrey A. Holmes
The improvement of the efficiency of neutral beam systems to be compatible with the economic requirements of fusion power plants is a key theme in the European research programme. A novel plasma neutralizer, in which the negative ion beam itself is the source of the plasma, is described. Its success depends on the confinement of the free electrons …
PublishedD. B. King A. J. T. Holmes R. Mcadams E. Surrey
A one dimensional model of the sheath between the plasma and the wall in a negative ion source has been expanded to include the effects of a variable wall surface work function and fast positive ion species. The plasma consists of positive ions, electrons and negative ions. The model also includes the emission of negative ions from the wall into th…
PublishedR. Mcadams D. B. King A. J. T. Holmes E. Surrey
In fusion negative ion sources, the negative ions are formed on the caesiated plasma grid predominantly by hydrogen atoms from the plasma. The space charge of the negative ions leaving the wall is not fully compensated by incoming positive ions and at high enough emission a virtual cathode is formed. This virtual cathode limits the flux of negative…
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