File:Fig222 Hollow Cathode Curve.PNG
http://scitation.aip.org/getpdf/servlet/GetPDFServlet?filetype=pdf&id=JAPIAU000074000012007094000001&idtype=cvips&doi=10.1063/1.355023&prog=normal
Summary
Plot of typcal Hollow Cathode current emission based on keeper relative voltage
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