Deflection of streamer channels in high magnetic field

Streamer propagation on a dielectric film under transverse magnetic field of 3 T produced by a superconducting magnet is investigated using the Lichtenberg figure technique. A streamer propagation mode is proposed, taking account of the electric field in the space charge region left behind the streamer and the field enhancement effect at the streamer tip. Through comparison of the experimental results of the streamer deflection characteristics with the theoretical prediction, the electric field in the space charge region is supposed to reach a value of 2 to 3 kV/cm. The internal field causes voltage drop across the space charge region, while the electric field is enhanced in the concentrated positive streamer head. On the other hand, the negative streamer spreads uniformly and the field concentration effect at the tip is weak.<
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