A new laser-induced fluorescence (LIF) technique was developed to directly measure the electric field distributio nwith high spatial resolution in plasma edges under magnetic field. As a model-type experiment, sheath electric field distribution was measured in front of a biased metal plate inserted into an ECR helium plasma flow under magnetic field. Good agreement was obtained between the potnetial difference over the sheath determined from the measured distribution and the applied bias voltage. Applicability of our LIF technique to the case of strong magnetic field was discussed. Detectable range of the electric field is estimated.
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