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Magnetically driven filament probe.

A Schmid1, A Herrmann, V Rohde

  • 1Max-Planck-Institut für Plasmaphysik, EURATOM Association, Boltzmannstrasse 2, D-85748 Garching, Germany. aschmid@ipp.mpg.de

The Review of Scientific Instruments
|June 8, 2007
PubMed
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This summary is machine-generated.

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A new radially movable probe system has been developed for studying filamentary transport during edge localized modes (ELMs) in plasma fusion devices. This probe enables detailed measurements of filament structure and rotation, crucial for understanding plasma behavior.

Area of Science:

  • Plasma Physics
  • Fusion Energy Research
  • Diagnostic Techniques

Background:

  • Edge Localized Modes (ELMs) are transient plasma instabilities in fusion devices.
  • Filamentary transport is a key mechanism for energy and particle loss during ELMs.
  • Accurate in-situ measurements are needed to characterize these filaments.

Purpose of the Study:

  • To develop and implement a radially movable probe for studying filamentary transport during ELMs.
  • To enable detailed measurements of filament structure, rotation, and size.
  • To investigate plasma behavior in the scrape-off layer during ELMs.

Main Methods:

  • A radially movable probe equipped with Langmuir tips and magnetic pickup coils was developed.
  • The probe utilizes a magnetic drive for linear motion (5 cm range, 50 ms) within the ASDEX Upgrade vacuum vessel.

Related Experiment Videos

  • The probe is positioned at the outer midplane to access regions of maximum ELM filament amplitude.

    • Main Results:

    • The probe system allows for controlled radial movement, exposing diagnostic elements to the scrape-off layer plasma.
    • Measurements of filament rotation via time delay and size via peak width analysis are feasible.
    • The probe's design offers flexibility in range and velocity scaling for diverse experimental needs.

    Conclusions:

    • The developed radially movable probe is a valuable diagnostic tool for ELM filament studies.
    • It provides new capabilities for investigating filamentary transport dynamics in fusion plasmas.
    • This technology contributes to a better understanding of plasma-wall interactions in devices like ASDEX Upgrade.