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Confinement scaling in the advanced reversed-field pinch
KTH, School of Electrical Engineering (EES), Centres, Alfvén Laboratory Centre for Space and Fusion Plasma Physics.ORCID iD: 0000-0001-6379-1880
KTH, School of Electrical Engineering (EES), Centres, Alfvén Laboratory Centre for Space and Fusion Plasma Physics.
2006 (English)In: Plasma Physics and Controlled Fusion, ISSN 0741-3335, E-ISSN 1361-6587, Vol. 48, no 11, L97-L104 p.Article in journal (Refereed) Published
Abstract [en]

A numerical study of confinement scaling in the advanced reversed-field pinch ( RFP) is presented. In the advanced RFP, the tearing mode activity that dominates conventional RFP plasma fluctuations is reduced by current profile control ( CPC). In this work, theoretical limits for confinement in the advanced RFP are explored, modelling a CPC with internally applied electric fields. The obtained scalings of ion temperature, poloidal beta value, energy confinement time and magnetic field fluctuations indicate strongly improved confinement as compared with the conventional RFP. Reactor relevant on-axis temperatures are obtained using ohmic heating alone. Pressure driven modes persist within the present 3D nonlinear, resistive, single-fluid MHD model, but may be reduced by non-ideal effects.

Place, publisher, year, edition, pages
2006. Vol. 48, no 11, L97-L104 p.
Keyword [en]
Electric current control, Electric field effects, Fluid dynamics, Magnetic field effects, Mathematical models, Numerical analysis, Three dimensional computer graphics
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-6333DOI: 10.1088/0741-3335/48/11/L01ISI: 000242550000001Scopus ID: 2-s2.0-33846094480OAI: oai:DiVA.org:kth-6333DiVA: diva2:11018
Note
QC 20100906Available from: 2006-11-13 Created: 2006-11-13 Last updated: 2017-12-14Bibliographically approved
In thesis
1. Numerical studies of current profile control in the reversed-field pinch
Open this publication in new window or tab >>Numerical studies of current profile control in the reversed-field pinch
2006 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

The Reversed-Field Pinch (RFP) is one of the major alternatives for realizing energy production from thermonuclear fusion. Compared to alternative configurations (such as the tokamak and the stellarator) it has some advantages that suggest that an RFP reactor may be more economic. However, the conventional RFP is flawed with anomalously large energy and particle transport (which leads to unacceptably low energy confinement) due to a phenomenon called the "RFP dynam".

The dynamo is driven by the gradient in the plasma current in the plasma core, and it has been shown that flattening of the plasma current profile quenches the dynamo and increases confinement. Various forms of current profile control schemes have been developed and tested in both numerical simulations and experiments.

In this thesis an automatic current profile control routine has been developed for the three-dimensional, non-linear resistive magnetohydrodynamic computer code DEBSP. The routine utilizes active feedback of the dynamo associated fluctuating electric field, and is optimized for replacing it with an externally supplied field while maintaining field reversal. By introducing a semi-automatic feedback scheme, the number of free parameters is reduced, making a parameter scan feasible. A scaling study was performed and scaling laws for the confinement of the advanced RFP (an RFP with enhanced confinement due to current profile control) have been obtained.

The conclusions from this research project are that energy confinement is enhanced substantially in the advanced RFP and that poloidal beta values are possible beyond the previous theoretical limit beta βΘ < ½. Scalings toward the reactor regime indicate strongly enhanced confinement as compared to conventional RFP scenarios, but the question of reactor viability remains open.

Place, publisher, year, edition, pages
Stockholm: KTH, 2006. 52 p.
Series
Trita-EE, ISSN 1653-5146 ; 2006:053
Keyword
Reversed-Field Pinch, RFP, Current Profile Control, CPC, DEBS, DEBSP, active control, feedback, MHD.
National Category
Fusion, Plasma and Space Physics
Identifiers
urn:nbn:se:kth:diva-4167 (URN)91-7178-500-0 (ISBN)
Public defence
2006-11-30, Kollegiesalen (F3), Lindstedtsvägen 26, Stockholm, 10:00
Opponent
Supervisors
Note
QC 20101101Available from: 2006-11-13 Created: 2006-11-13 Last updated: 2010-11-01Bibliographically approved

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