How does a disk MHD generator differ from a linear Hall generator?

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magnetohydrodynamic power generator Comparison of the operating principles of (A) a turbogenerator and (B) an MHD generator.

In a magnetohydrodynamic (MHD) generator, the Hall effect causes electric current to flow at an angle across the channel, creating an axial electric field. Different configurations are designed to manage this effect.1

The linear Hall generator is a duct-based configuration where the Faraday field across each sector is short-circuited, and the sectors are connected in series to allow a single electric load to be connected between the ends of the channel.1

In contrast, the disk generator is a distinct configuration where the plasma flows through a disk-shaped channel. Its primary differences include:

Current Path: The load current flows radially, while the short-circuited Faraday currents flow in closed circular paths.1
Output: The Hall output is collected between the center and the periphery of the disk.1
Application: The disk configuration is considered an attractive alternative to the linear Hall generator, particularly when nonequilibrium ionization is employed.1