Abstract
The Brookhaven National Laboratory NSLS X-ray and VUV rings currently use capacitively loaded lambda/4 Rf accelerating cavities. These cavities are manufactured from copper clad plate steel and require a tuning system with a considerable range. Three separate tuning systems are provided, each having its own specific problems and interactions occur between the three systems. A single capactive tuning system is proposed which will vary the capacitance loading of the cavity directly. The system employs a vacuum balance mechanically driven diaphragm. The control system allows 6 mm of motion at a maximum slewing rate of 1.0 mm per sec. and yeilds a dynamic tuning range of 480 KHz. Design and fabrication details will be presented together with early testing and operating experience.
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