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• W829966496 abstract "The role of resonant magnetic field perturbations leading to the formation of magnetic islands or stochastic fields is of specific interest in toroidal magnetic confinement. Stochastic fields are for example used for ELM mitigation in tokamaks. In stellarators island structures are used to form the divertor. The naive picture of an island is that it acts as a radial short circuit for the plasma. However, depending on the island width perpendicular transport across the island may well compete with parallel transport. Thus, the study of the influence of islands on turbulence, which dominates the radial transport in the edge of fusion devices is an ongoing object of research. At the WEGA stellarator the existence of non-natural islands at low order (m = 1,2) rational surfaces is known from flux surface measurements. These islands can be controlled in width and poloidal phase by means of error field compensation coils (EFCC). Due to the low β in WEGA the vacuum magnetic configuration is only negligibly altered during plasma operation. Hence, it is possible to study turbulence in the vicinity of islands and compare results from configurations differing only in amplitude and phase of magnetic field perturbations. In a first campaign an increased turbulent radial E ×B flux near the O-point of an m/n = 1/5 island has been found utilizing a poloidal Langmuir probe array. Radial E × B flux profiles show an elevation in the island which vanishes at reduced island width. For detailed studies of the dynamics of turbulent structures in the poloidal plane a new 2D probe array has been designed and installed. A 7×9 matrix of probes can be placed in the islands both on the low field side and on the high field side where the islands are significantly wider. Data are analyzed statistically in order to allow comparison with theoretical expectations, e.g. a splitting of turbulent structures at the X-point [1]. Furtheron, magnetic diagnostics were used to investigate current density fluctuations which are expected to drive the observed increased turbulence activity in the islands at low collisionality [2]. Here, the moderate plasma parameters in WEGA allow the use of small pickup coils inside the plasma and thus local current density measurements." @default.
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• W829966496 date "2010-01-01" @default.
• W829966496 modified "2023-09-23" @default.
• W829966496 title "Turbulence in Magnetic Islands: An Investigation of the Poloidal Dynamics in the WEGA Stellarator" @default.
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