Magnetic Confinement Fusion—Experimental Physics: Reversed Field Pinches

Zuin, M.

doi:10.1016/b978-0-12-819725-7.00166-5

Cited by 1 publication

(2 citation statements)

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“…In this condition, the self-regulating magnetic flux pumping mechanism in tokamaks maintains the core safety factor close to q = 1, thus preventing sawteeth through a MHD dynamo emf [24,25]. It is worth to mention that the same effect maintains helical equilibria in RFP plasmas [20].…”

Section: Introductionmentioning

confidence: 84%

“…Moreover, with the aim of proposing ways to improve the confinement properties, active modification of dynamo activity and self-organization processes has been investigated in both ULq and RFP by means of pulsed poloidal and toroidal electric fields [16][17][18][19][20]. Synchronized to the application of the pulsed electric fields, a remarkable response of the several ULq plasma parameters had been observed.…”

Section: Introductionmentioning

confidence: 99%

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Dynamics of ultralow-q plasmas in the RFX-mod device

Zuin¹,

Agostini²,

Auriemma³

et al. 2022

Nucl. Fusion

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The results are presented of an experimental activity performed in the RFX-mod device aimed at characterizing plasma dynamics in the so-called ultralow-q (ULq) magnetic configuration, which corresponds to edge safety factor values below 1. The role of the edge safety factor in determining plasma dynamics is studied. In particular, a characterization of MHD activity is performed. The results of dedicated non-linear 3D visco-resistive MHD simulations are in good quantitative agreement with the experimental observations. In particular, the predicted tendency for ULq plasmas to be characterized by magnetic spectra dominated by a single mode (either a kink or a double resonant internal mode) is confirmed by experiment. Magnetic reconnection plays a relevant role in determining the dynamics of the magnetic topology. Both almost quiescent and largely uctuating plasmas are observed with a strong sensitivity on the edge safety factor. The main MHD properties of the ULq are compared to those of RFP and tokamak discharges, also produced in the RFX-mod device. MHD modes exhibit toroidal rotation at a frequency depending on mode amplitude. Differently from what encountered in RFP plasmas at comparable current levels, no wall locking is detected.

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Section: Introductionmentioning

confidence: 84%