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A magnetically shielded sampling technique is developed which permits determination of plasma parameters by orifice probe, electrostatic analyser or mass spectrometer for medium-pressure magnetised plasmas. Experimental results show that: for a retarded-electron current no abnormal peak or non-exponential potential dependence of current potential characteristics as observed by previous orifice probe measurements in a magnetised plasma is observed; electron temperature measurements agree to within 10% with recent positive-column electron temperature theory; and plasma density measurements agree to within a factor of 3 with electrostatic probe measurements.
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Chang et al. (1977) studied this question.
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