TCV team

Dynamics of the fast-ion acceleration in type-I ELMy H-mode scenarios on the TCV tokamak

J. Poley, A. Jansen van Vuuren, J. Galdón-Quiroga, S. Mazzi et autres

Abstract Fast ions have been observed to be accelerated in the presence of Edge Localised Modes (ELMs) and MHD activity on the Tokamak á Configuration Variable. The acceleration time, velocity-space and frequency dynamics have been resolved by analysing the fast-ion losses measured …

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Design, Installation, and First Results from the Ion Cyclotron Emission Diagnostic on TCV

Roman Ochoukov, B.P. Duval, M. Dreval, Anton Jansen van Vuuren et autres

TCV is a medium sized tokamak equipped with a large suite of plasma diagnostics, a versatile array of poloidal shaping coils, an electron cyclotron heating system, and a two source neutral beam injection (NBI) system. The NBI system is capable of a …

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H-Mode Sol Profiles And Transport Dependence On Separatrix Operational Space

Vianello N., Stagni A., Redl A., Eich T. et autres

A comparative investigation between the TCV and ASDEX-Upgrade (AUG) tokamak on the role of separatrix turbulent parameter ?t in setting Scrape Off Layer profiles and trasported is reported. We provide evidences that at higher values of ?t, where the plasma around the …

Experiments and gyrokinetic simulations of TCV plasmas with negative triangularity in view of DTT operations

Balestri A., Mantica P., Bagnato F., Coda S. et autres

In the last few decades, experiments on several medium-size tokamaks (TCV [1], DIII-D [2] and AUG [3]) have shown that giving the plasma a Negative Triangularity (NT) poloidal crosssectional shape can cause a reduction of turbulent transport with respect to Positive Triangularity …

Negative triangularity scenarios: from TCV and AUG experiments to DTT predictions

Mariani A., Mantica P., Casiraghi I., Aucone L. et autres

Experiments, gyrokinetic simulations and transport predictions have been performed to investigate if a negative triangularity (NT) L-mode option for the DTT full power scenario would perform similarly to the positive triangularity (PT) H-mode reference scenario, avoiding the harmful edge localized modes (ELMs). …

Characterization of the edge turbulence and electron profiles in TCV tokamak with the Thermal Helium Beam diagnostic

Agostini Sandra M, Ugoletti M., La Matina M., Andrebe Y. et autres

A Thermal Helium Beam diagnostic, recently installed on TCV, allows measurement of the radial profiles of electron density and temperature at the outboard midplane edge and Scrape Off Layer, together with their high frequency turbulent fluctuations up to 200 kHz. The edge …

Recent Progress in Runaway Electron Research at TCV

Decker J., Sheikh U., Hoppe M., Duval B.P. et autres

Runaway electrons (REs) are a concern for fusion reactors from the startup to the termination of tokamak discharges. The sudden localized loss of a multi-MA RE beam can inflict severe damage to the first wall. The Tokamak à Configuration Variable (TCV) has …

Analysis of multiscale electron heat transport in JET, AUG and TCV plasmas, confronting experiments with gyrokinetic simulations and reduced models

Mariani A., Bonanomi N., Mantica P., Angioni C. et autres

Micro-turbulence driven by ion-scale ITG-TEM [1] instabilities is mostly considered the main driver of core transport in present tokamaks. In addition, it has been shown that electron-scale ETGs [2] can impact the electron heat transport, also exchanging energy with ITG-TEM turbulence by …

Wall conditioning in fusion devices with superconducting coils

Wauters T., Brakel R. Borodin D., Brezinsek S., Coda S. et autres

This contribution reviews the currently applied wall conditioning methods in fusion devices with special emphasis on wall conditioning in the presence of a permanent magnetic field by applying RF discharges at the ion- and electron cyclotron range of frequencies (ICRF resp. ECRF). …

Investigation of the impact of ETGs on electron heat transport in TCV plasmas with NBI and ECH injection

Mariani A., Mantica P., Brunner S., Fontana M. et autres

In the most important future fusion devices, like ITER, the core temperature and fusion performance will strongly depend on electron heat transport, which is dominated by turbulent processes. Electron Temperature Gradient (ETG) micro-turbulence modes have been recently shown to impact the electron …

Parameter dependences of runaway electron dynamics on ASDEX Upgrade and TCV

Papp G., Pautasso G., Decker J., Carnevale D. et autres

Density profile peaking in the presence of ECRH heating in TCV

A. Yu. Zabolotsky, H. Weisen, TCV team

Experimental observations in stationary ECRH discharges in TCV show that additional heating has a strong effect on the electron density profile. In the absence of MHD activity or strong internal transport barriers, additional electron heating generally leads to a broadening of the …

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