The spiral accelerator is a helical resistive coating on a cathode-ray tube (CRT), designed to minimize beam compression in the post-deflection acceleration system by applying a gradually increasing acceleration voltage along the bulb's length.
It was first suggested in 1938 but not developed into a practical device.
The spiral accelerator displaced multi-band acceleration by the 1960s.
- Peter Keller, The Cathode-Ray Tube: Technology, History, and Applications, pp.110-114. Palisades Press, 1991. ISBN 0963155903, 9780963155900 → online copy
- Oscilloscope Cathode-Ray Tube Concepts, Chuck Devere, 1969