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ASCOT modelling of ripple effects on toroidal torque
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics.ORCID iD: 0000-0002-7142-7103
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2008 (English)In: Contributions to Plasma Physics, ISSN 0863-1042, E-ISSN 1521-3986, Vol. 48, no 1-3, 77-81 p.Article in journal (Refereed) Published
Abstract [en]

Toroidal field ripple, delta=(B-max-B-min)/(B-max+B-min) in ITER will be relatively large, about 0.5% at the outer midplane. Due to the importance of toroidal rotation on plasma stability and confinement it is important to understand the consequences of a non-negligible ripple field on rotation. Guiding centre following Monte Carlo code ASCOT is used to evaluate the torque on plasma from co-current NBI in presence of toroidal magnetic field ripple. Simulations are made for a JET discharge from 2007 Ripple Campaign aimed to clarify the effect of ripple on fusion plasmas in preparation for ITER. ASCOT results show large reduction of torque from co-NBI and negative torque from thermal ions, which together could create a counter rotating edge plasma.

Place, publisher, year, edition, pages
2008. Vol. 48, no 1-3, 77-81 p.
Keyword [en]
MC, GC orbit following, ripple, torque
URN: urn:nbn:se:kth:diva-17465DOI: 10.1002/ctpp.200810013ISI: 000255134400012OAI: diva2:335509
QC 20100525Available from: 2010-08-05 Created: 2010-08-05Bibliographically approved

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