Transonic plasma flow passing through a magnetic mirror

M. Inutake, A. Ando, K. Hattori, H. Tobari, T. Makita, H. Isobe

Research output: Contribution to journalArticlepeer-review


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 ID isentropic model.

Original languageEnglish
Pages (from-to)141-146
Number of pages6
JournalFusion Science and Technology
Issue number2 T.
Publication statusPublished - 2007 Feb


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