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The representation of magnetic fields by magnetic field lines is very useful in visualizing the strength and direction of the magnetic field. Each of the magnetic field lines forms a closed loop. The field lines emerge from the north pole (N), loop around to the south pole (S), and continue through the bar magnet back to the north pole.
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Related Experiment Video

Updated: Jul 12, 2026

Atom Probe Tomography Analysis of Exsolved Mineral Phases

Atom Probe Tomography Analysis of Exsolved Mineral Phases

Published on: October 25, 2019

Filamentary probe on the COMPASS tokamak.

K Kovarik¹, I Duran¹, J Stockel¹

¹Institute of Plasma Physics of the CAS, Za Slovankou 3, Prague 182 00, Czech Republic.

The Review of Scientific Instruments

|April 5, 2017

Summary

Researchers developed a new filamentary probe for the COMPASS tokamak to measure plasma filament properties. This tool enables statistical analysis of plasma behavior between the divertor and midplane.

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Area of Science:

Plasma physics
Fusion energy research
Tokamak diagnostics

Background:

Understanding plasma filaments in the scrape-off layer (SOL) is crucial for tokamak operation.
Previous diagnostic limitations hindered detailed measurement of filament properties and evolution.
The COMPASS tokamak provides a platform for studying SOL plasma phenomena.

Purpose of the Study:

To introduce and describe a novel filamentary probe for COMPASS.
To enable measurement of electrostatic and magnetic properties of plasma filaments.
To investigate filament behavior as a function of radial distance from the separatrix.

Main Methods:

A new filamentary probe head mounted on a radial manipulator.
Shot-to-shot radial movement for statistical and evolutionary measurements.
Data acquisition for electrostatic and magnetic properties of filaments in the SOL.

Main Results:

Successful implementation of the filamentary probe on the COMPASS tokamak.
Demonstrated capability to measure filament properties and their radial dependence.
Presentation of initial conditional averages of plasma filaments during L-mode.

Conclusions:

The new filamentary probe is a valuable diagnostic for studying SOL plasma filaments.
The probe facilitates long-term statistical measurements and analysis of filament evolution.
This work provides foundational data for understanding plasma transport in tokamaks.