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Home / Publications / Journals / Fusion Science and Technology / Volume 51 / Number 2T / Pages 141-146

Transonic Plasma Flow Passing Through a Magnetic Mirror

M. Inutake, A. Ando, K. Hattori, H. Tobari, T. Makita, H. Isobe (20R01)

Fusion Science and Technology / Volume 51 / Number 2T / February 2007 / Pages 141-146

Technical Paper / Open Magnetic Systems for Plasma Confinement

Dynamics of a fast-flowing plasma through a magnetic mirror field was investigated. A highly-ionized, high-density, He plasma produced by a quasi-steady MPD arcjet (MPDA) was injected into a magnetic mirror. In a uniform magnetic field region, ion acoustic Mach number (Mi) was almost unity, while in a diverging field region the Mach number increased up to 2-3. When the supersonic plasma flows into a converging field region, a shock-like structure was formed. The subsonic flow downstream of the shock was re-accelerated up to Mi of 2-3. The sonic condition (Mi=1) is satisfied at the magnetic mirror throat as in a conventional Laval nozzle. The adiabatic exponent of ions was evaluated by comparing measured spatial profiles with the prediction from 1D isentropic model.

 
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