Physics of transport barriers
2004 (English)In: Brazilian journal of physics, ISSN 0103-9733, Vol. 34, no 4B, 1822-1827 p.Article in journal (Refereed) Published
The concept of ExB flow velocity shear suppression is utterly fundamental in modem fusion research. It is asserted that there are models enabling to understand the physics involved in LH transitions. To improve the understanding of the mechanisms leading to the formation of Transport Barriers, especially the relation between Internal and Edge barriers it is necessary to invoke the issue of electric fields. Edge transport barriers are the feature of the H-mode, the baseline regime of ITER, whereas Internal Transport Barriers are used to develop regimes that might be employed for steady state operation of ITER, definitely beneficial for design and operation of fusion power plants in the future. Their synergy will be addressed. Plasma flows are closely connected to electric fields. Therefore, their role is crucial for understanding of tokamaks aimed at the achievement of fusion energy. This appears in the well known neoclassical theory as the most accomplished and selfconsistent basis for understanding of fusion plasmas. It pertains to the novel concept of zonal flows emerging from the recent development of gyro-kinetic transport codes. The equilibrium poloidal and toroidal flows are also crucial for the concept of the electric field shear suppression of plasma turbulence in tokamaks. Yet, this timely and topical issue has remained largely unaddressed experimentally because of great difficulties in measuring flows in plasmas.
Place, publisher, year, edition, pages
2004. Vol. 34, no 4B, 1822-1827 p.
mode transition, tokamak, rotation
IdentifiersURN: urn:nbn:se:kth:diva-23993DOI: 10.1590/S0103-97332004000800055ISI: 000226209500055ScopusID: 2-s2.0-12744278736OAI: oai:DiVA.org:kth-23993DiVA: diva2:342692
QC 20100525 QC 20111018. 10th Latin American Workshop on Plasma Physics/7th Brazilian Meeting on Plasma Physics. Sao Pedro, BRAZIL. NOV 30-DEC 05, 20032010-08-102010-08-102011-10-18Bibliographically approved