Improved Computer Simulations of Energy Confinement in the Advanced Reversed-field Pinch
2006 (English)In: 33rd EPS Conference on Plasma Phys, 2006Conference paper (Refereed)
A revised algorithm for numerical simulations of the advanced reversed-field pinch (RFP) is presented. The results show improved scalings of magnetic fluctuations, energy confinement time τE and poloidal beta βθ with basic initial parameters as compared to what has been presented by the authors in earlier studies of the advanced RFP. The improved behaviour of the advanced RFP stems from the introduction of current profile control (CPC), implemented through a scheme of active feedback of the electric dynamo field. The work, which has an optimistic approach and sweeps over a large parameter domain reaching into the reactor relevant region, is theoretical and claims to answer the question of how far CPC can bring the RFP concept in principle. Experimental implementation is thus a later concern. With this scheme, a state with strongly suppressed tearing mode activity is achieved, which allows for a theoretical study of pressure driven resistive g-modes. This is a task that has been very hard to perform in the past, since tearing modes have always dominated the RFP dynamics. Thus it is now possible, for the first time, to investigate whether pressure driven modes, which are persistent in the RFP, are fatal for the confinement of a high-beta RFP configuration or if they can be accepted in a future reactor.
Place, publisher, year, edition, pages
Fusion, Plasma and Space Physics
IdentifiersURN: urn:nbn:se:kth:diva-78504ScopusID: 2-s2.0-84872654169ISBN: 978-162276333-7OAI: oai:DiVA.org:kth-78504DiVA: diva2:492579
33d EPS Conference on Plasma Physics, Rome, Italy, 19-23 June, 2006
QC 201411032012-02-082012-02-082014-11-04Bibliographically approved