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A good signal-to-noise ratio has been obtained during initial operation of the 500-keV TEXT heavy ion beam probe. A number of problems were identified during the start up phase and they have been or are being corrected. Present sensitivity for detecting changes in the space potential is 50 V, but it is expected that this can be reduced to 5 V when additional calibration and alignment procedures are completed.
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Schoch et al. (1986) studied this question.
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