A method of using operational amplifiers in beam control systems is described. A basic preamplifier is used with various output stages to control beam energy and position by magnetic and electrostatic means. The use of commercially available operational amplifiers provides great advantages in simplifying design, construction, and maintenance.

1.
K.
Eklund
,
Rev. Sci. Instr.
30
,
328
(
1959
), preceding paper.
2.
The standard use of operational amplifiers are described, among others, by J. E. Gibson and F. B. Tutews, Control System Components (McGraw‐Hill Book Company, Inc., New York, 1958).
3.
Burlington, Massachusetts.
4.
Private communication.
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