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Plasma Flow Measurement by Mach Probes in GAMMA 10

A. Ando et al. (19P01)

Fusion Science and Technology / Volume 51 / Number 2T / February 2007 / Pages 217-219

Technical Paper / Open Magnetic Systems for Plasma Confinement /

Calibration of an up-down type Mach probe is performed using a fast-flowing plasma produced by a magneto-plasma-dynamic arcjet. Mach probe data are compared with ion acoustic Mach numbers Mi, which are calculated using a plasma flow velocity Up and an ion temperature Ti measured by spectroscopy and electron temperature Te by Langmuir probe. The obtained data are also compared with Hutchinson's PIC simulation results in an unmagnetized plasma and are in good agreement with each other. First attempts to measure plasma flow field using a Mach probe are performed at the open-end section in GAMMA10. It is found that Mi at r=0 is more than 2, namely a supersonic plasma flow is formed in the end-cell region.

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