American Nuclear Society

Home / Publications / Journals / Fusion Science and Technology / Volume 51 / Number 2T

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.

Questions or comments about the site? Contact the ANS Webmaster.