A 352-MHz fast-ferrite tuner, manufactured by Advanced Ferrite Technology, was tested on a single-cell rf.cavity at the Advanced Photon Source. Low-power rf testing was performed on the tuner-cavity combination to evaluate tuning range, bandwidth, stability, and compatibility with existing Advanced Photon Source lowlevel rf hardware. The test system comprises a single-cell copper rf cavity, a bipolar DC bias supply for the ferrite tuner, a water flow and temperature metering and interlock system, and a low-level if cavity tuning loop consisting of an rf phase detector and a PID amplifier. Test data will be presented.

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The 352-iMHz high-power system for the Advanced Photon Source (APS) storage ring and booster synchrotron has been configured to allow two to four klystrons to power the storage ring and one klystron to power the booster. A quadrature hybrid combines two klystron outputs with two 45" phase shifters at each output of the hybrid for proper phasing at the storage ring cavities for the selected mode. The phase shifters in the hybrid outputs and three waveguide switches are used to choose an operation mode in any one of twelve possible configurations using three to five klystrons to power the storage ring and booster. The system can be configured to use one klystron as the power source of a test station.

cod b 970503--tion side of the synchrotron ring. This phase shifter is u$d AbstractThe Advanced Photon Source (APS) is a 7-GeV full energy positron storage ring for generating synchrotron radiation with an injector. The booster synchrotron rf system consists of a single 1-MW klystron which drives four five-cell cavities at 352 MHz. The storage ring cavities consist of four groups of four single cells powered by two 1-MW klystrons for 100-mA operation. An overview of the operation of the APS 352-MHz rf systems is presented.