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AbstractAbstract
[en] The Flinders Spherical Tokamak program aims to make an inductively coupled fully ionised, hot, target plasma carrying substantial toroidal current, and then apply a rotating magnetic field (RMF) to attempt to maintain that current. This approach to testing RMF current drive is an alternative to that of substantially increasing the applied RMF power. For all tokamak devices, the power required for plasma formation and for the establishment of plasma current exceeds that required for flat top current operation, in some cases by a factor of four or more. Models of RMF current drive applied to a fully ionised plasma at 50 eV show that it will require substantially less RF power to maintain the current than that needed during the startup phase. In addition one can consider a distribution of the total input RF power into that accepted as screening current power and that accepted as power associated with the steady driven plasma toroidal current. Models show that the screening current power for a given plasma is essentially independent of the driven current, but that the power associated with the steady driven plasma current increases strongly as the driven electrons approach an angular velocity close to that of the rotating magnetic field. For this reason a larger fraction of the applied RF power could become available for current drive if the inductively prepared target plasma has a current close to 'Nef', where N is the total number of electrons in the plasma vessel and f is the RMF frequency. This means there will be greater efficiency of power usage for current drive. As well as a target plasma for RMF current drive testing, the Flinders Spherical Tokamak will provide a plasma test facility for the collaboration between Flinders University and the National Fusion Facility on diagnostic techniques. The information on this poster demonstrates that the Flinders Spherical Tokamak project has been constructed and is operational. RMF for current drive will be applied when the Flinders University RF power sources become available
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Australian Institute of Nuclear Science and Engineering, Lucas Heights, NSW (Australia); 133 p; 1999; p. 117; 22. AINSE plasma science and technology conference. Plasma'99; Canberra (Australia); 8-9 Feb 1999; Extended abstract
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