ISSN:
1089-7623
Source:
AIP Digital Archive
Topics:
Physics
,
Electrical Engineering, Measurement and Control Technology
Notes:
An electron impact ion source using a solid charge was interfaced with A/D and D/A units which are connected to a microprocessor control unit. A PID (proportional, integral, and derivative) control algorithm was implemented to control the ion source. The power fed to the ion source filament and furnace filament are controlled so as to keep both the discharge voltage and current constant. With this controlled ion source, the result shows a steady ion current. For example, with Pb+ ions, an initial ion current of 13 μA stayed within ±1.5 μA for 60 min; with no control, the ion current fell steadily and had to be manually reset three times every 20 min over a 60-min run. Similar results have been obtained with Mg+, Al+, Zn+, and Sn+ ions.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1138939
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