Search

The NAL booster - accelerator radio-frequency system design is described in detail. This rapid-cycling system is ferrite tuned from 30 MHz to 53 MHz. Each high-power module has an RF-output rating of 100 kW provided by a cascode amplifier which is a removable part of the cavity assembly. The low-level portion of the system corrects for both systematic and non-systematic tracking errors using a single set of wide-band beam sensors. In the design of a storage-ring RF system, the control of the beam-cavity interaction is a basic problem. This paper describes an arrange ment of TEM mode cavity, cascode power amplifier, beam pickup and feedback control loop to achieve a cavity-gap impedance of about 10 ohms over a frequency range from the synchrotron-oscillation frequency (a few Hz) to the higherharmonics of the bunch frequency. The design center radiofrequencyis 53.1 MHz.

As accelerators are developed to extend the frontiers of high energy physics, the complexity of their nature presents technological problems that need to be solved by extensive programs of research and development. The following reports on the results of one such program, the design and construction of the radio frequency accelerating system of the Argonne Zero Gradient Synchrotron. It describes the system requirements, the equipment that has been developed to fulfill these requirements, and the present performance of the system.