Abstract
We have improved a low background-rate microchannel-plate detector for 15 to 27 keV ions by using a strip anode. This detector uses an aluminum oxide conversion dynode which is impacted by the ions at grazing incidence. A number of secondary electrons are liberated from the dynode and pulled into the microchannel plate which is operated in saturation. The charges are summed by the strip anode to produce an output signal proportional to both the number of the secondary electrons and the number of the strips. From analysing the two-dimensional spectrum it is indicated that the background rate is 2 × 10−4 s−1 at 80% counting efficiency, or 8 × 10−5 s−1 at 50% for 27 keV 40Ar ions.
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