A higher harmonic cavity system is under construction in the ALS to extend beam lifetime. The implementation will be carried out in stages. The plan is to operate the system in the passive mode as a start and, depending on various factors, the plan may evolve into an active system eventually to attain the optimum beam lifetime at all beam current levels. The RF system must be designed accordingly to support the various stages of implementation. This report will describe the various RF systems along the path leading to the fully implemented system
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