AbstractThree-dimensional turbulence simulations of a RFX-mod diverted plasma are performed in the presence of a biasing electrode. The simulations show a strong suppression of turbulent transport caused by the induced

E×B

flow shear, which leads to the formation of an edge transport barrier with a pedestal-like structure, in qualitative agreement with RFX-mod experiments. The strong

E×B

flow shear turbulence suppression with edge voltage biasing is also observed in the proximity of the density limit crossing, suggesting that edge voltage biasing may allow for larger maximum achievable density values. By leveraging the simulation results, the theoretical scaling law of the edge pressure gradient length derived in (Giacomin and Ricci 2020 J. Plasma Phys.86 5) is extended here to account for the

E×B

flow shear turbulence suppression caused by voltage biasing. The improved theoretical scaling with typical RFX-mod shearing rate values predicts a factor of two increase of the pressure gradient at the separatrix, which is comparable to RFX-mod experiments in the presence of voltage biasing. The implications of the flow shear turbulence suppression due to voltage biasing on the density limit in RFX-mod are also discussed.

01 Feb 2025·Fusion Engineering and Design

The control and data acquisition system of the DTT experiment

Author: Centioli, C. ; Zanon, F. ; Manduchi, G. ; Mosetti, P. ; Boncagni, L. ; Martini, G. ; Paccagnella, G. ; Sartori, F. ; Ambrosino, R.

DTT, Divertor Tokamak Test facility, is currently under construction at the Frascati ENEA Research Center.Its main aim is to explore alternative solutions for the extraction of the heat generated by the fusion process.Its Control and Data Acquisition System (CODAS) will (1) orchestrate and synchronize all the DTT systems during Plasma operation and maintenance; (2) acquire data from the experiment diagnostics and plant systems and store it in an exptl. database to be used for online and off-line anal.; (3) provide real-time Plasma control.The expected duration of the plasma discharge in DTT is in the order of some tens of seconds and therefore DTT can be considered a long-lasting experiment, involving data streaming technologies for data communication and storage.The main DTT CODAS design is based on three principles: (1) Taking inspiration from other similar experiments currently under development, namely ITER CODAC, (2) relying on proven solutions already adopted in running experiments with similar constraints and (3) taking advantage from practices widely adopted in fusion and, more in general, in industry.Despite using components already adopted in other fusion experiments, DTT CODAS is the first system that seamlessly integrates all of them.

01 Jun 2024·Journal of Instrumentation

Summary of caesium evaporation and deposition during SPIDER first campaign

Author: Serianni, G. ; Candela, V. ; Rizzolo, A. ; Sartori, E. ; Pouradier Duteil, B. ; Cavallini, C. ; Fadone, M. ; Barbisan, M. ; Gasparrini, C.

AbstractSPIDER (Source for the Production of Ions of Deuterium Extracted from a Radio frequency plasma) is currently in a major shutdown period dedicated to the upgrade of several components in order to enhance its performances and guarantee their agreement with the ITER requirements. During this phase, an in-depth inspection of the beam source components is fundamental to understand SPIDER behaviour during the previous experimental campaigns, and in particular caesium evaporation inside the source by means of Cs ovens. Caesium evaporation and its deposition on the plasma grid (PG) is fundamental to minimize the work function of PG surface causing an increased generation of negative ions and a reduction of the electron density in front of the PG, which means less co-extracted electrons. This work presents the analysis of the caesium ovens performances and of their status after removal. Inductively Coupled Plasma Mass Spectrometry (ICP-MS) analyses were carried out on samples of plasma source walls, and the experimental data was compared to the results obtained from other investigations: numerical models for the caesium evaporation and deposition, chemical surface analyses (performed in strategical locations of the source walls and extraction grid), and Laser Absorption Spectroscopy (LAS) measurements. The non-uniformity of Cs distribution has been taken into account since it has repercussions on negative ion extraction efficiency and uniformity.

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