Wendelstein 7-X: Magnetic Field Topology Analysis Across Coil Current Configurations

A 2026 analysis of vacuum magnetic field topology in the Wendelstein 7-X (W7-X) stellarator by researchers from the Plasma Science and Fusion Center Dataverse. The work develops an automated scheme to locate magnetic fixed points (X- and O-points) and calculates the trace of the Jacobian (Tr(M)) for them. It includes two sets of coil current scans: individual coil variations and a random scan of over 200,000 magnetic configurations.

Use Cases

• Modeling the effect of non-planar coils on establishing island chain phases based on the description.
• Analyzing how planar coils modify island chain location by controlling the rotational transform (iota) profile.
• Studying the impact of control coil current on island size and phase, as described.
• Investigating the relationship between |(Tr(M) − 2)| and the minor radius of fixed points.
• Identifying experimental candidates by using |(Tr(M) − 2)| as a proxy for internal island chain size.

Strengths

• Analysis includes a large random scan of over 200,000 magnetic configurations.
• Explicitly verifies the roles of non-planar, planar, and control coils.
• Develops a fast automated scheme for locating magnetic fixed points.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.

Provenance

Source

Plasma Science and Fusion Center Dataverse

Collection Method

Computational analysis of vacuum magnetic field topology via coil current scans.

Freshness

Last updated 2026-06-23 19:48:43; freshness should be verified.