Abstract
Faraday collectors are used in isotopic ratio mass spectrometers for measurement of ion beam intensities. Ions striking the collector surface result in secondary electron emission that constitutes an error current. Typical collectors use electrical suppressors for minimizing current due to secondary electrons. However, due to mechanical errors in the placement of electrical suppressors, collection efficiency may vary for different collectors. In present study, different techniques for reducing secondary electron contribution have been investigated. These are: (a) use of magnetic field (instead of electric field) for secondary electron suppression, (b) graphite coating to reduce secondary electron emission and (c) inclination of collector to 45° with respect to ion beam. Studies have resulted in a mechanically simpler design and improved performance that has been demonstrated by measurement of 87Sr/86Sr isotopic ratio.
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