Single helical axis configurations are emerging as the natural state for high-current reversed field pinch plasmas. These states feature the presence of transport barriers in the core plasma. Here we present a method for computing the equilibrium magnetic surfaces for these states in the force-free approximation, which has been implemented in the SHEq code. The method is based on the superposition of a zeroth-order axisymmetric equilibrium and of a first-order helical perturbation computed according to Newcomb's equation supplemented with edge magnetic field measurements. The mapping of the measured electron temperature profiles, soft x-ray emission and interferometric density measurements on the computed magnetic surfaces demonstrates the quality of the equilibrium reconstruction. The procedure for computing flux surface averages is illustrated, and applied to the evaluation of the thermal conductivity profile. The consistency of the evaluated equilibria with Ohm's law is also discussed.

Martines, E., Lorenzini, R., Momo, B., Terranova, D., Zanca, P., Alfier, A., et al. (2011). Equilibrium reconstruction for single helical axis reversed field pinch plasmas. PLASMA PHYSICS AND CONTROLLED FUSION, 53(3) [10.1088/0741-3335/53/3/035015].

Equilibrium reconstruction for single helical axis reversed field pinch plasmas

Martines E
Primo
;
2011

Abstract

Single helical axis configurations are emerging as the natural state for high-current reversed field pinch plasmas. These states feature the presence of transport barriers in the core plasma. Here we present a method for computing the equilibrium magnetic surfaces for these states in the force-free approximation, which has been implemented in the SHEq code. The method is based on the superposition of a zeroth-order axisymmetric equilibrium and of a first-order helical perturbation computed according to Newcomb's equation supplemented with edge magnetic field measurements. The mapping of the measured electron temperature profiles, soft x-ray emission and interferometric density measurements on the computed magnetic surfaces demonstrates the quality of the equilibrium reconstruction. The procedure for computing flux surface averages is illustrated, and applied to the evaluation of the thermal conductivity profile. The consistency of the evaluated equilibria with Ohm's law is also discussed.
Articolo in rivista - Articolo scientifico
reversed field pinch; RFP; quasi-single helicity; QSH; equilibrium
English
19
Martines, E., Lorenzini, R., Momo, B., Terranova, D., Zanca, P., Alfier, A., et al. (2011). Equilibrium reconstruction for single helical axis reversed field pinch plasmas. PLASMA PHYSICS AND CONTROLLED FUSION, 53(3) [10.1088/0741-3335/53/3/035015].
File in questo prodotto:
File Dimensione Formato  
117 - PPCF 11 helical equilibrium reconstruction.pdf

accesso aperto

Tipologia di allegato: Publisher’s Version (Version of Record, VoR)
Dimensione 911.47 kB
Formato Adobe PDF
911.47 kB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/351968
Citazioni
  • Scopus 31
  • ???jsp.display-item.citation.isi??? 27
Social impact