A comparison of cusp and mirror topologies for 𝛽 → ∞ magnetic confinement

July 2026 | B.J. Sporer | Journal of Plasmas Physics | Paper

The magnetic confinement topologies potentially capable of macro-stability with core plasma pressure greatly exceeding the vacuum magnetic field pressure (or ‘β → ∞’) are discussed.

Dependence of field-reversed configuration formation in collisional merging experiments on the mirror magnetic field strength

July 2026 | S. Ishiwata (Nihon Univ.) | Journal of Plasmas Physics | Paper

Collisional merging experiments on field-reversed configurations (FRCs) in the FRC amplification via translation–collisional merging (FAT-CM) device have suggested that the mirror magnetic field strength influences the final merged plasma state.

Characterization of a compact electron cyclotron resonance plasma source under negative DC biasing and microwave plasma cathode operation

February 2026 | Y. Shimabukuro | Plasma Sources Science and Technology | Paper

To realize future long-lifetime negative hydrogen ion sources, two approaches were investigated using a compact coaxial ECR plasma source: direct negative DC biasing and a microwave plasma cathode (MPC) configuration. In noble gases such as argon, …

Line-Integrated Density From Neutral Beam Shinethrough on a Beam-Driven FRC

June 2026 | C. Exton | HTPD 2026 | Poster

Neutral beam shinethrough detectors on C-2W enable axial FRC density profile reconstruction validated against WarpX simulations, with augmented normalization yielding line-integrated densities consistent with Far-Infrared Interferometry measurements.

Implementation of a Neutral Density Diagnostic for Edge Neutral Characterization in C-2W

June 2026 | J. Wood | HTPD 2026 | Poster

A Lyman-alpha neutral density diagnostic implemented on C-2W reveals edge neutral profiles in FRC plasmas, with emissivity correlating positively with plasma loss rates, confirming fast-ion charge exchange as a significant energy loss mechanism and enabling 3D radial neutral density reconstruction.

Measuring Radial and Azimuthal Thermal Ion Drifts in C-2W using Charge Exchange Recombination Spectroscopy

June 2026 | Y. Zhou | HTPD 2026 | Poster

Dual-line-of-sight CHERS simultaneously measures radial and azimuthal thermal ion drifts in C-2W, showing azimuthal drifts significantly exceed radial drifts at r > 15 cm, consistent with FRC equilibrium models and confirming constant axial magnetic flux during stable operation.