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High Resolution Probe for filament transport and current density study at the edge region of W7-X

Spolaore M.; Agostinetti P.; Killer C.; Cavazzana R.; Ghiraldelli R.; Grenfell G.; Grulke O.; Moresco M.; Martines E.; Neubauer O.; Nicolai D.; Satheeswaran G.; Schweer B.; Vianello N.; Visentin M.; W7-X Team

Conference: 3rd European Conference on Plasma Diagnostics (ECPD 2019), , Lisbon, Portugal , May 6-9, 2019 Year: 2019
ISTP Authors:
Raffaele Ghiraldelli
Nicola Vianello
Monica Spolaore
Piero Agostinetti

Keywords: ,
Research Activitie:

For the study of electrostatic and magnetic properties of filaments characterizingthe edge region of the stellarator experiment W7-X, a specifically designedinsertable probe head was constructed within the framework of EUROfusion WP.S1 work package in collaboration between Consorzio RFX, IPP Greifswald and FZJJulich. The probe head, named High Resolution Probe (HRP), was conceived to beinstalled on the mid-plane multi-purpose fast reciprocating manipulator on W7-X. Electromagnetic filamentary turbulent structures are found to characterize theedge region of different magnetic configurations [M. Spolaore et al., PoP 2015] including Reversed Field Pinch, stellarator and tokamak, where strong currents areassociated also to ELM filamentary structures. The study of those phenomena inW7-X stellarator is of particular interest as the electromagnetic features offilaments are expected to become more relevant with the increase of the localplasma beta. In particular the aim is to provide information about the presenceand the features of parallel current density associated to filamentary turbulent or ELM-like structures. Furthermore, the possibility to measure the time evolution ofthe flow radial profiles using the Mach probe array was considered as a further interesting part of the study, given the strong interplay expected between theturbulent fluctuation and the average flows. Further important information provided is the radial propagation of turbulent flux. The contribution will present the design development, the R&D studies and theapplied solutions for the sensors embedded in the probe head. In particular, the presence of 140 GHz ECRH plasma environment represents one of the main challenges for reliable magnetic fluctuation measurements. First measurements were performed during the W7-X experimental campaign OP1.2b, where in particular the probe was exploring different magnetic configurations. The respective features of the electromagnetic turbulence will be compared.

ID 403280
PRODUCT TYPE Proceeding Paper
LAST UPDATE 2022-09-21T16:55:35Z
TITLE Implementation of activities described in the Roadmap to Fusion during Horizon 2020 through a Joint programme of the members of the EUROfusion consortium